DE102010028404A1 - Valve for regulating a fluid flow - Google Patents

Abstract

The invention relates to a valve (1) for regulating a fluid flow (2), in particular a fiber suspension flow (2.1) which is preferably guided in a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, comprising a hollow body (3) an essentially at least partially rotationally symmetrical cavity (4) having a longitudinal axis (4.L), the at least one inlet opening (5) having a longitudinal axis (5.L) with an inlet channel (5.1), a variable and essentially rotationally symmetrical passage area (6) and an outlet opening (7) with an outlet channel (7.1), and one which can be displaced coaxially in the cavity (4) of the hollow body (3), preferably by means of at least one actuating means (10), the passage surface (6) as a result of a displacement ( V) variable valve rod (8), in particular having a valve disk (9) and preferably rotationally symmetrical. The valve (1) according to the invention is characterized in that the valve rod (8) is guided in the axial direction (R) by means of at least two at least radially acting bearing units (11.1, 11.2) with a degree of freedom necessary for the displacement (V).

Description

The invention relates to a valve for regulating a fluid flow, in particular a preferably in a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, guided pulp suspension flow, comprising a hollow body having a substantially at least partially rotationally symmetrical and a longitudinal axis having cavity, the at least one, having a longitudinal axis inlet opening having an inlet channel, a variable and substantially rotationally symmetrical passage surface and an outlet opening with an outlet channel, and a preferably by means of at least one actuating means coaxially displaceable in the cavity of the hollow body, the passage area as a result of a shift variable, in particular a valve disk having and preferably rotationally symmetrical valve rod.

Such a valve for a liquid is for example from the document EP 0 633 416 A1 known. The liquid is a stock suspension which can be fed to a headbox of a paper machine.

The valves commonly used today in a machine for producing a fibrous web, in particular a paper, board or packaging paper web, in particular dilution water valves, are important functional elements of the headbox and, together with other components, largely responsible for the quality of the fibrous web to be produced. Reliable, trouble-free and long-lasting valve characteristics are an important prerequisite for achieving the best possible quality. The fulfillment of these properties is particularly important under the conditions prevailing in the fiber web manufacturing conditions in which at least one fiber suspension must be controlled with some very high content of fine and filler continuously and at a high temperature of up to about 70 ° C, very important.

The valves used by the various manufacturers of machines for producing a fibrous web, in particular dilution water valves are sometimes completely different. Thus, in addition to linear valves and rotary valves are successfully in use. In this case, the respective movable member for regulating the fluid flow, for example, a valve rod, or a torsion body with holes, with respect to ease, tightness, positioning accuracy and vibration stress is exposed to special requirements. These requirements decisively determine the structure of the guide and sealing elements.

A linear valve, as for example from the cited document EP 0 633 416 A1 or the pamphlets DE 199 49 067 C1 or EP 1 591 585 B1 is known, tends due to the "flying length" of the valve rod to vibrate and due to the stripping or sliding stress of the seal on the valve rod to leak. The sealing problem is of the highest relevance in particular if, for mechanical reasons, only one guide or sealing element is provided in the valve. As a second management / storage point in the sense of fixed bearing is then shared with this arrangement, the storage of the axis of the actuating means. The then resulting in an undesirable seal wear leakage can, depending on the mounting position, on sensitive electronic neighboring components, such as the actuating means, run off and destroy it with appropriate exposure time by the ingress of water / water vapor.

In contrast, a rotary valve tends, as for example from the document EP 0 633 352 B1 is known, due to very accurate components, which usually have metallic sliding surface and smallest clearances, relatively easy to "caking". In particular, the risk of caking is very great when in the at least one pulp suspension contained fines and fillers can dry on the principle of large-scale rotary body. Moving or "tearing" of the rotary valve with the appropriate actuating means is often problematic or no longer possible after long periods of inactivity in the range of 1 to 2 days.

Furthermore, for regulating a fluid flow, in particular one preferably in a machine for producing a fibrous web, in particular a paper; Cardboard or packaging paper web, guided pulp suspension flow also known from the prior art ball valves, valves, control valves, diaphragm valves, pinch valves, needle valves or the like can be used. However, they all have disadvantages known to those skilled in the art.

It is therefore an object of the invention to improve a valve of the type mentioned in such a way that the mentioned disadvantages of the prior art are largely reduced, preferably even completely avoided. In particular, the valve rod should be guided statically determined and elastically mounted, preferably with a damping effect on the valve stem.

This object is achieved in a valve of the type mentioned according to the invention that the valve rod by means of at least two at least radially acting bearing units with a degree of freedom necessary for the displacement is guided in the axial direction. The at least two bearing units may additionally act in directions other than the radial direction.

The object of the invention is completely solved in this way.

The guide according to the invention and thus storage of the valve rod causes a statically determined leadership (with two movable bearings and a bearing) and an elastic storage of the same when generating a damping effect on the same. The axial positioning of the valve stem takes place in a known manner by means of the actuating means.

The valve rod is preferably guided by means of two bearing units which act at least radially and which have a bearing spacing in the range from 2 to 12, preferably from 3 to 10, in particular from 5 to 8, · average valve rod diameter. By this relatively widely spaced bearing units results in a reinforced elastic bearing of the valve stem. In addition, in this case the flying support of the valve rod, ie the projection of the valve rod over the last bearing unit in the cavity of the hollow body into a value in the range of 30 to 150%, preferably assume 50 to 150% of the bearing distance of the two at least radially acting bearing units ,

Furthermore, the two at least radially acting bearing units preferably additionally act as sealing units, wherein the first, the cavity of the hollow body facing and at least radially acting bearing unit designed as a wear-prone primary seal and the second, the cavity of the hollow body facing away and at least radially acting bearing unit as a follower secondary seal is. This has the consequence that only when a wear of the primary seal, a local leakage occurs, which ultimately leads to the use of the hitherto still unused secondary seal. And the then used secondary seal prevents effectively running along the leakage liquid on the valve rod to the actuating means. As a result, the seal replacement intervals of the valve can be significantly increased compared to the prior art, since the secondary seal only comes into engagement when leakage occurs at the primary seal.

The respective at least radially acting bearing unit preferably comprises at least one elastic outer ring, in particular an O-ring, a quad ring or the like which causes the hollow-body-side seal and a hard inner ring, in particular a Stepseal ^® rod and piston seal or the like, the valve rod side seal causes. In this case, the elastic outer ring of the materials NBR, FKM, EPDM or similar elastomeric materials exist and he determined due to its material properties and the "bias", ie the pressure in its installation space, the characteristics of the desired damping and the softness of the primary storage. On the other hand, the hard inner ring can be made of the materials PTFE, PPSU, PE and similar plastics and it essentially determines the sliding and wear properties due to the choice of materials and the stripping capacity of the secondary bearing due to the shaping. Overall, this positively support the favorable properties of the multi-part valve stem seal with an inner and outer ring, the overall concept for the valve according to the invention.

Furthermore, the two at least radially acting and the valve rod leading bearing units are preferably indirectly by means of at least one guide device, in particular a cartridge and at least partially stored in the hollow body. The actual storage of the valve stem is thus not directly in the hollow body of the valve, but in a separate support member, the so-called "cartridge". This results in significant benefits in terms of maintenance and service.

Thus, the guide device, in particular the cartridge is preferably at least partially supported and preferably positioned by means of a sealing part between the hollow body and a holder arranged on the hollow body for the actuating means. The fixation of the guide means, in particular the cartridge thus takes place by a "closed" installation between the two components, being positioned and sealed even with a small radial clearance in the sealing part and in the motor mount. Also, this fixation principle is suitable for a two-piece valve assembly, which accommodates the desire for a quick visual inspection ("inspection") of the valve interior. For this purpose, by loosening a few, preferably two screws, the so-called valve insert together with its mounting can be pulled out of the valve housing.

Moreover, the guide device, in particular the cartridge is preferably designed fully symmetrical or approximately fully symmetrical and the two at least radially acting and the valve rod leading bearing units are arranged in a suitable manner in frontally mounted recesses, in particular open grooves. Thus, the preferably executed as a rotating part guide means, in particular cartridge ensures a very accurate due to its production and aligned bearing assembly. Also, a very simple installation and removal of the valve stem seals in "open" grooves at the respective end of the guide device, in particular the cartridge done, in which case no additional tools or mounting devices are necessary. Furthermore, this arrangement with the additional removable guide means, in particular cartridge has the advantage of a much simpler and faster seal change. It must be introduced into the valve housing interior, no deep possibly existing valve stem seals whose installation is often possible only with special devices.

The guide device, in particular the cartridge is preferably designed so that a possibly occurring leakage at the cavity of the hollow body facing and at least radially acting bearing unit, in particular the wear-stressed primary seal over transverse bores and / or annular grooves to the outside, ie to the surface of the valve is feasible , A possibly leaking leakage fluid fills the gap-shaped space between the seals and can only run to the outside via a "riser" described below. As a result, the space filled with leakage liquid and thus the valve rod is kept moist and can hardly dry out practically. A buildup of fines contained in the leakage fluid and fillers "behind" the primary seal on the valve stem does not take place or only slightly. This leads to a significant protection of the already damaged primary seal, as there is always a liquid or at least pasty fluid on both sides of the seal, which acts much less abrasive than a dried on and sanding "coating" on the valve stem. This effect described is also very helpful for the life of the secondary seal, since this only has to seal a liquid or at least pasty fluid, which is always very easily strippable from the valve stem. Even without the riser leading outwards, this positive "damp-room effect" would exist between the two seals. Overall, the general reliability, in particular the reduction of the risk of trapping due to dried-on leakage fluid is significantly improved, since the gap-shaped space between the two seals can dry out only extremely slowly. In addition, the seal replacement intervals are extended or the operator is signaled an imminent need for a seal change, without uncontrolled leaking leakage liquid and leads to damage to electrical and electronic components.

Furthermore, the guidance of the possibly facing the cavity of the hollow body and at least radially acting bearing unit, in particular the wear-loaded primary seal occurring leakage to the surface of the valve preferably by means of at least one in the hollow body and / or arranged in a hollow body holder for the actuating means arranged and preferably closable leakage drain opening, in particular leakage drain hole. A possible leakage is passed through the motor bracket to the outside and the operator can be signaled the need for a seal change. The leakage drain opening, in particular leakage drain hole can be closed, in particular in the case of a very strong leakage outlet, for example by means of a screw and a plug. The leakage drain opening, in particular leakage drain hole also serves as a "vent line" to avoid a "pumping effect" between the two seals. The "pumping effect" is caused by axial movement, that is taking along one of the two seals during an adjustment movement of the valve rod and can lead to the formation of a negative pressure, which literally "sucks" the fluid to be sealed under the seal.

Further, between the two at least radially acting bearing units preferably a gap-shaped intermediate space is formed, which is filled with means, in particular fats, soaps and the like for lubricating and improving the sealing function. This gap between the two seals can also serve as a reservoir for "dragged" fine particles for particularly "difficult" paper stocks, such as the finest "sand particles" contained in the pulp suspension. The particles are then embedded in the fat or soap and deposited. In addition, improved lubrication of the valve rod and the seals can be achieved by suitable fillers, in particular lubricants.

The inlet opening is preferably arranged in the hollow body such that its longitudinal axis intersects with the longitudinal axis of the hollow space of the hollow body at an intersection. This arrangement of the two longitudinal axes, the longitudinal axis of the inlet opening and the longitudinal axis of the cavity of the hollow body, causes a rotation-free, staupunktfreie and cavitation-free guidance of the fluid flow, in particular pulp suspension flow with the lowest possible pressure loss in the fluid flow, in particular pulp suspension flow. The cavity of the hollow body thus undergoes a central and staupunktsfreie flow without any swirl flow.

By definition, the longitudinal axis of the inlet opening is the center vertical of the inlet opening. In addition, the valve according to the invention preferably has only one, a longitudinal axis having inlet inlet with an upstream in the flow direction inlet channel, the longitudinal axis may in turn be arranged coaxially or at an angle to the longitudinal axis of the inlet opening. The valve according to the invention has in the hollow body a main flow direction for the fluid flow, in particular pulp suspension flow, which runs substantially coaxially with the longitudinal axis of the hollow space of the hollow body.

The two longitudinal axes intersecting at the point of intersection, namely the longitudinal axis of the inlet opening and the longitudinal axis of the cavity of the hollow body, preferably have a cutting angle in the range from 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °. The longitudinal axis of the inlet opening can thus be convergent to the flow main direction of the fluid flow in the hollow body (cutting angle> 90 °), perpendicular to the main flow direction of the fluid flow in the hollow body (cutting angle = 90 °) or divergent to the main flow direction of the fluid flow in the hollow body (cutting angle 90 °). These cutting angle ranges provide spatial advantages, in particular with regard to the immediate juxtaposition of a plurality of valves according to the invention and / or the arrangement with further components and groups, such as with the distributor, in particular the transverse distribution tube.

Also, the area of the preferably rotationally symmetrical valve rod which projects at least in regions into the hollow space of the hollow body is preferably free of surfaces and / or edges lying perpendicular to the flow main direction of the fluid flow, in particular fibrous suspension flow.

This in turn is advantageous in view of a low pressure loss in the fluid flow, in particular pulp suspension flow.

And in order that the flow guidance can be realized optimally in terms of process technology and with a reduced pressure loss in the fluid flow, in particular pulp suspension flow, the region of the preferably rotationally symmetrical valve rod projecting into the cavity of the hollow body preferably has a plurality of regions with different constant, converging or divergent outer contours.

Furthermore, the fluid stream to be regulated, in particular partial fluid flow, is preferably a dilution water stream or white water stream which contains fractions of solids of a pulp suspension.

The valve according to the invention can also be used in an outstanding manner in a headbox for a machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, from at least one fibrous stock suspension. The headbox may in this case be designed as a sectioned dilution water headbox with a pitch width of N x 25 mm or N x 33.3 mm, where N is preferably a natural number, and in at least one, preferably in each dilution water line at least one be arranged according to the invention valve.

The valve according to the invention can also be used in an outstanding manner in a machine for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension. The machine can be constructed according to the prior art and have all known machine areas.

Further features and advantages of the invention will become apparent from the following description of several preferred embodiments with reference to the drawings.

Show it

1 a schematic perspective view of a valve according to the invention for regulating a fluid flow, in particular a pulp suspension stream;

2 a schematic longitudinal section through that in the 1 illustrated valve according to the invention for regulating a fluid flow;

3 a schematic and partial plan view of the in the 1 illustrated valve according to the invention for regulating a fluid flow;

4 a schematic detail view of the in the 2 illustrated valve according to the invention for regulating a fluid flow;

5 a schematic detail view of the in the 4 illustrated valve according to the invention for regulating a fluid flow;

6 a schematic perspective view of the in 5 illustrated guide means of the valve according to the invention for regulating a fluid flow;

7 a schematic detail view of the in the 5 illustrated valve according to the invention for regulating a fluid flow; and

8th a schematic sectional view through a known sectioned dilution water headbox comprising at least one inventive valve for regulating a fluid flow.

The 1 shows a schematic perspective view of a valve according to the invention 1 for regulating a fluid flow 2 (Arrow), in particular a pulp suspension stream 2.1 (Arrow). The pulp suspension stream 2.1 (Arrow) can, for example, in a machine known to those skilled 200 be led for the production of a fibrous web, in particular a paper, cardboard or packaging paper web (see. 8th ).

The valve 1 comprises a hollow body 3 with a substantially at least partially rotationally symmetric and a longitudinal axis 4.1 (dashed line; double arrow) having cavity 4 , the only one, a longitudinal axis 5.L (dashed line) having inlet opening 5 , a variable and substantially rotationally symmetrical passage surface 6 and an outlet opening 7 has (see also 2 ).

The inlet opening 5 is a not further shown inlet channel 5.1 in the flow direction S (arrow) of the fluid flow 2 (Arrow) upstream. On the other hand is the outlet opening 7 a merely indicated outlet channel 7.1 in the main flow direction H (arrow) of the fluid flow 2 (Arrow) (see also 2 ).

Furthermore, the valve comprises 1 one by means of an actuating means 10 coaxially in the cavity 4 of the hollow body 3 movable, the passage area 6 as a result of a displacement V (double arrow) changeable, preferably a valve disc 9 having and preferably rotationally symmetrical valve rod 8th (see also 2 ).

The 2 shows a schematic longitudinal sectional view through that in the 1 illustrated inventive valve 1 for regulating a fluid flow 2 (Arrow).

It is clear that the valve stem 8th by means of at least two at least radially acting bearing units 11.1 . 11.2 with a degree of freedom necessary for the displacement V (double arrow) in the axial direction R (double arrow) is guided. This results in a statically determined guide (with two loose bearings and a fixed bearing) and an elastic bearing of the valve stem 8th when generating a damping effect on the same effects. The axial positioning of the valve stem 8th takes place in a known manner by means of the actuating means 10 , The at least two storage units 11.1 . 11.2 may also act in other directions than the radial direction.

The valve rod 8th is thus by means of two at least radially acting bearing units 11.1 . 11.2 led, which has a bearing distance 11.A in the range of 2 to 12, preferably from 3 to 10, in particular from 5 to 8, · average valve stem diameter 8.Dm have (see also 4 ). Through these relatively far apart arranged storage units 11.1 . 11.2 results in a reinforced elastic bearing of the valve stem 8th , In addition, the flying bearing of the valve stem should be used 8th So the supernatant 8.Ü the valve rod 8th over the last storage unit 11.1 in the cavity 4 of the hollow body 3 a value in the range of 30 to 150%, preferably from 50 to 150%, of the bearing distance 11.A the two at least radially acting bearing units 11.1 . 11.2 accept (see also 4 ).

Furthermore, the inlet opening 5 in the hollow body 3 arranged such that its longitudinal axis 5.L (dashed line) with the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 of the hollow body 3 intersects at an intersection P (cf. 4 ). The longitudinal axis 5.L the inlet opening 5 is by definition the center vertical M of the inlet opening 5 ,

And the cavity 4 of the hollow body 3 is also designed such that the one flow main direction H (arrow) having fluid stream 2 (Arrow), in particular pulp suspension stream 2.1 (Arrow) stasis free or nearly stasis free and rotation free or nearly free of rotation with respect to the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 flows through him. The cavity 4 of the hollow body 3 So experiences a central and Staupunktsfreie flow without any swirl flow.

The 3 shows a schematic and partial plan view of the in the 1 illustrated inventive valve 1 for regulating a fluid flow 2 (Arrow).

Also in this plan view can be seen that the inlet opening 5 in the hollow body 3 is arranged such that its longitudinal axis 5.L (Dot) with the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 of the hollow body 3 at an intersection P intersects, and that the cavity 4 of the hollow body 3 is formed such that the fluid flow having a flow main direction H (arrow) 2 (Arrow), in particular pulp suspension stream 2.1 (Arrow) stasis free or nearly stasis free and rotation free or approximate rotation-free with respect to the longitudinal axis 4.L of the cavity 4 flows through him.

The 4 shows a schematic detail view of the in the 2 illustrated valve according to the invention 1 for regulating a fluid flow 2 (Arrow).

The valve rod 8th is, as already mentioned, by means of at least two at least radially acting bearing units 11.1 . 11.2 with a degree of freedom necessary for the displacement V (double arrow) in the axial direction R (double arrow) out. This results in a statically determined guide (with two loose bearings and a fixed bearing) and an elastic bearing of the valve stem 8th when generating a damping effect on the same effects.

The two at least radially acting and the valve rod 8th leading storage units 11.1 . 11.2 are in turn by means of at least one guide device 17 , in particular a cartridge 17.1 indirectly and at least partially in the hollow body 3 of the valve 1 stored. The management device 17 , especially the cartridge 17.1 is at least partially by means of a sealing part 18 between the hollow body 3 and one on the hollow body 3 arranged bracket 19 stored for the actuating means, not shown, and preferably also positioned.

The guidance of possibly at the the cavity 4 of the hollow body 3 facing and at least radially acting bearing unit 11.1 , in particular a wear-stressed primary seal 11.P occurring leakage to the surface of the valve 1 takes place by means of at least one of the hollow body 3 arranged bracket 19 for the actuating means 10 arranged and preferably closable leakage drain opening 20 , in particular leakage drainage hole 20.1 , Alternatively or additionally, the closable leakage drain opening 20 , in particular leakage drainage hole 20.1 also in the hollow body 3 be arranged.

Furthermore, as already mentioned, the inlet opening 5 in the hollow body 3 arranged such that its longitudinal axis 5.L (dashed line) with the longitudinal axis 4.L (dashed line, double arrow) of the cavity 4 of the hollow body 3 at an intersection P intersects. The longitudinal axis 5.L the inlet opening 5 is by definition the center vertical M of the inlet opening 5 ,

The two intersecting in the intersection P longitudinal axes 4.L (dashed line; double arrow), 5.L (dashed line) have a cutting angle α in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °. The longitudinal axis 5.L (dashed line) of the inlet opening 5 Thus, it can converge to the main flow direction H (arrow) of the fluid flow 2 (Arrow) in the hollow body 3 (Intersection angle α> 90 °), perpendicular to the main flow direction H (arrow) of the fluid flow 2 (Arrow) in the hollow body 3 (Intersection angle α = 90 °) or divergent to the main flow direction H (arrow) of the fluid flow 2 (Arrow) in the hollow body 3 Be aligned (intersection angle α <90 °). In the illustrated embodiment, the intersection angle α assumes a value of 90 °, the two intersecting longitudinal axes 4.L (dashed line; double arrow), 5.L (dashed line) thus run perpendicular to each other.

Furthermore, at least the cavity 4 of the hollow body 3 free from perpendicular to the main flow direction H (arrow) of the fluid flow 2 (Arrow), in particular pulp suspension stream 2.1 (Arrow) lying surfaces and / or edges. Also, that's in the cavity 4 of the hollow body 3 at least partially projecting area 8.1 the preferably rotationally symmetrical valve rod 8th free from perpendicular to the main flow direction H (arrow) of the fluid flow 2 (Arrow), in particular pulp suspension stream 2.1 (Arrow) lying surfaces and / or edges.

• – die eine Längsachse 5.L aufweisende Einlassöffnung 5 weist einen Durchmesser 5.D im Bereich von 10 bis 60 mm, vorzugsweise von 15 bis 50 mm, auf;
• – ein Übergangsbereich 12 weist einen Übergangswinkel β im Bereich von 60 bis 120°, vorzugsweise von 80 bis 100°, insbesondere von 85 bis 95°, auf;
• – ein zylindrischer oder annähernd zylindrischer Bereich 13 weist einen Durchmesser 13.D im Bereich von 10 bis 60 mm, vorzugsweise von 15 bis 50 mm, und eine Länge 13.L im Bereich von 0,1 bis 50 mm, vorzugsweise von 0,1 bis 20 mm, (bzw. 0,5 bis 1,5, vorzugsweise 0,8 bis 1,2, · Durchmesser 13.D) auf;
• – die veränderbare und im Wesentlichen rotationssymmetrische Durchtrittsfläche 6 ist ein Konfusor 6.1, der eine Länge 6.1.L im Bereich von 10 bis 100 mm, vorzugsweise von 20 bis 50 mm, und einen Winkel γ von 60 bis 90°, vorzugsweise von 70 bis 80°, aufweist;
• – der Endbereich 14 des Konfusors 6.1 und ein zylindrischer oder annähernd zylindrischer Bereich 15 weisen einen Durchmesser 15.D im Bereich von 5 bis 30 mm, vorzugsweise von 10 bis 20 mm, auf, wobei der zylindrische oder annähernd zylindrische Bereich 15 zudem einen Länge 15.L von 0,1 bis 50 mm, vorzugsweise von 2 bis 20 mm, (bzw. 0,2 bis 0,8, vorzugsweise 0,5 bis 0,7, · Durchmesser 15.D) aufweist; und/oder
• – ein Diffusor 16 weist eine Länge 16.L im Bereich von 10 bis 100 mm, vorzugsweise von 20 bis 50 mm, und einem Winkel δ von 60 bis 90°, vorzugsweise von 70 bis 80°, auf.

The flow direction S (arrow) or flow main direction H (arrow) of the fluid flow 2 (Arrow), in particular pulp suspension stream 2.1 (Arrow) ordered areas of the cavity 4 of the hollow body 3 have the following properties:

• - the one longitudinal axis 5.L having inlet opening 5 has a diameter 5.D. in the range of 10 to 60 mm, preferably 15 to 50 mm;
• - a transition area 12 has a transition angle β in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °, on;
• - A cylindrical or approximately cylindrical area 13 has a diameter 13.D in the range of 10 to 60 mm, preferably 15 to 50 mm, and a length 13.L in the range of 0.1 to 50 mm, preferably 0.1 to 20 mm, (or 0.5 to 1.5, preferably 0.8 to 1.2, diameter 13.D ) on;
• - The variable and substantially rotationally symmetrical passage area 6 is a confuser 6.1 , which is a length 6.1.L in the range of 10 to 100 mm, preferably 20 to 50 mm, and has an angle γ of 60 to 90 °, preferably 70 to 80 °;
• - the end area 14 of the confuser 6.1 and a cylindrical or approximately cylindrical area 15 have a diameter 15.D in the range of 5 to 30 mm, preferably 10 to 20 mm, wherein the cylindrical or approximately cylindrical portion 15 also has a length 15.L from 0.1 to 50 mm, preferably from 2 to 20 mm, (or 0.2 to 0.8, preferably 0.5 to 0.7, · diameter 15.D ) having; and or
• - a diffuser 16 has a length 16.L in the range of 10 to 100 mm, preferably 20 to 50 mm, and an angle δ of 60 to 90 °, preferably from 70 to 80 °, on.

The 5 shows a schematic detail view of the in the 4 illustrated valve according to the invention 1 for regulating a fluid flow 2 (Arrow).

The two at least radially acting bearing units 11.1 . 11.2 additionally act as sealing units 11.P . 11.S , where the first, the cavity 4 of the hollow body 3 of the valve 1 facing and at least radially acting bearing unit 11.1 as a wear-stressed primary seal 11.P and the second, the cavity 4 of the hollow body 3 of the valve 1 remote and at least radially acting bearing unit 11.2 as, a follower secondary seal 11.S educated.

The respective at least radially acting bearing unit 11.1 . 11.2 preferably comprises at least one elastic outer ring 21 , in particular an O-ring, a quad-ring or the like, which causes the hollow-body-side seal, and a hard inner ring 22 , In particular like a step Seal ^® rod and piston seal and or which causes the valve rod side seal. In this case, the elastic outer ring 21 consist of the materials NBR, FKM, EPDM or similar elastomeric materials and he determined due to its material properties and the "bias", ie the pressure in its installation space, the characteristics of the desired damping and the softness of the primary storage. On the other hand, the hard inner ring 22 be made of the materials PTFE, PPSU, PE and similar plastics and he determined due to the material selection essentially the sliding and wear properties and due to the shaping of the stripping capacity of the secondary storage.

The 6 shows a schematic perspective view of the in the 5 shown guide device 17 , in particular cartridge 17.1 the valve according to the invention 1 for regulating a fluid flow 2 (Arrow).

The management device 17 , especially the cartridge 17.1 is executed fully symmetrical or approximately fully symmetrical and the two at least radially acting and not shown valve rod 8th leading, but not shown storage units 11.1 . 11.2 are each in frontally mounted recesses 23 , in particular open grooves arranged.

Moreover, the guide device 17 , especially the cartridge 17.1 designed so that a possibly occurring leakage at the the cavity 4 of the hollow body 3 facing and at least radially acting bearing unit 11.1 (see. 4 ), in particular the wear-stressed primary seal 11.P over cross holes 24 and / or annular grooves 25 to the outside, ie to the surface of the valve 1 is feasible (cf. 4 ).

The 7 shows a schematic detail view of the in the 5 illustrated valve according to the invention 1 for regulating a fluid flow 2 (Arrow).

The illustrated, the cavity 4 of the hollow body 3 facing and at least radially acting bearing unit 11.1 preferably comprises at least one elastic outer ring 21 , in particular an O-ring, a quad-ring or the like, which causes the hollow-body-side seal, and a hard inner ring 22 , In particular a Stepseal ^® rod and piston seal ( "Trelleborg Sealing Solutions", publication 99DEPS011AE0407) or the like, which causes the valve rod side seal. In this case, the elastic outer ring 21 consist of the materials NBR, FKM, EPDM or similar elastomeric materials and he determined due to its material properties and the "bias", ie the pressure in its installation space, the characteristics of the desired damping and the softness of the primary storage. On the other hand, the hard inner ring 22 be made of the materials PTFE, PPSU, PE and similar plastics and he determined due to the material selection essentially the sliding and wear properties and due to the shaping of the stripping capacity of the secondary storage.

Also, between the two at least radially acting bearing units 11.1 . 11.2 (see also 5 ) a gap-shaped gap 26 formed, the means known in the art 27 , in particular fats, soaps and the like for lubrication and improvement of the sealing function is filled.

The 8th shows a schematic sectional view through a known sectioned dilution water headbox 100 comprising a plurality of mutually spaced valves according to the invention 1 for regulating a fluid flow 2 . 2.T includes.

The illustrated sectioned dilution water headbox 100 is part of a non-illustrated, but known to the expert machine 200 for producing a fibrous web, in particular a paper, board or packaging paper web, of at least one Fibrous suspension. It comprises at least one pulp suspension 101 feeding feeding device 102 and a turbulence generating means 103 in which during operation of the dilution water headbox 100 the at least one pulp suspension 101 by a plurality of flow channels arranged in rows and in columns 104 flows, thereby divided in a flow direction having pulp suspension sub-streams and after exiting the turbulence generating means 103 in a preferably machine-wide chamber 105 is brought together again.

• 1. DE 10 2008 054 893.6 vom 18.12.2008: HPA14251 DE – „MJ II-3-Spalten”;
• 2. DE 10 2008 054 894.4 vom 18.12.2008: HPA14252 DE – „MJ II-EdgeModule”;
• 3. DE 10 2008 054 896.0 vom 18.12.2008: HPA14253 DE – „MJ II-Druckverlustverteilung”;
• 4. DE 10 2008 054 897.9 vom 18.12.2008: HPA14263 DE – „MJ II-Schichtenlose Hilfsstoffzugabe”;
• 5. DE 10 2008 054 898.7 vom 18.12.2008: HPA14265 DE – „MJ II-DoS-TE-Geometrie”;
• 6. DE 10 2008 054 899.5 vom 18.12.2008: HPA14310 DE – „MJ II-Verteilrohrlochplattendicke”;
• 7. DE 10 2009 027 013.2 vom 18.06.2009: HPA14466 DE – „MJ 11-W-STA”; und
• 8. DE 10 2009 027 721.8 vom 15.07.2009: HPA14569 DE – „MJ II-W-STA (Dosierrohr)”.

Upstream of the turbulence generating means 103 are a plurality of respective longitudinal direction and spaced apart in the width direction of the headbox means 106 for preferably controllable metered addition of a fluid 2 in partial fluid streams 2.T in the at least one pulp suspension 101 intended. With regard to the constructional and functional design of the means, reference is made to the following eight German patent applications of the applicant, the disclosure contents of which are hereby made the subject of the present description:

• 1. DE 10 2008 054 893.6 of 18.12.2008: HPA14251 EN - "MJ II-3 columns";
• Second DE 10 2008 054 894.4 dated 18.12.2008: HPA14252 EN - "MJ II EdgeModule";
• Third DE 10 2008 054 896.0 dated 18.12.2008: HPA14253 EN - "MJ II pressure loss distribution";
• 4th DE 10 2008 054 897.9 dated 18.12.2008: HPA14263 EN - "MJ II-Slat-free adjuvant addition";
• 5th DE 10 2008 054 898.7 dated 18.12.2008: HPA14265 EN - "MJ II-DoS-TE-Geometry";
• 6th DE 10 2008 054 899.5 dated 18.12.2008: HPA14310 EN - "MJ II distribution well plate thickness";
• 7th DE 10 2009 027 013.2 dated 18.06.2009: HPA14466 EN - "MJ 11-W-STA"; and
• 8th. DE 10 2009 027 721.8 dated 15.07.2009: HPA14569 EN - "MJ II-W-STA (dosing tube)".

The illustrated dilution water headbox 100 preferably has a pitch width T (section width) of the means 106 of N x 25 mm or N x 33.3 mm, where N is preferably a natural number.

The valve according to the invention 1 thus serves to regulate the fluid flow 2 , in particular the partial fluid flow 2.T , In the illustrated embodiment, the fluid flow 2 , in particular pulp suspension stream 2.1 a dilution water stream or white water stream containing solids fractions of a pulp suspension.

In summary, it should be noted that a valve of the aforementioned types is provided by the invention, which reduces the disadvantages of the prior art as far as possible, preferably even completely avoids. In particular, the valve stem is guided statically determined and elastically mounted, preferably with a damping effect on the valve stem.

LIST OF REFERENCE NUMBERS

1

Valve

2

Fluid flow (arrow)

2.1

Pulp suspension stream (arrow)

2.T

Fluid part stream

3

hollow body

4

cavity

4.L

longitudinal axis

5

inlet port

5.D.

diameter

5.L

longitudinal axis

5.1

inlet channel

6

Passage area

6.1

constrictor

6.1.L

length

7

outlet

7.1

exhaust port

8th

valve rod

8.1

Area

8.Dm

Middle valve stem diameter

8.Ü

Got over

9

valve disc

10

actuating means

11.1

storage unit

11.2

storage unit

11.A

bearing distance

11.P

primary seal

11.S

secondary seal

12

Transition area

13

Area

13.D

diameter

13.L

length

14

end

15

Area

15.D

diameter

15.L

length

16

diffuser

16.D

diameter

16.L

length

17

guide means

17.1

cartridge

18

sealing part

19

bracket

20

Leakage outlet opening

20.1

Leakage drain hole

21

outer ring

22

inner ring

23

recess

24

cross hole

25

ring groove

26

Gap

27

medium

100

Dilution water headbox

101

Fibrous suspension

102

feeder

103

Turbulence generator

104

flow channel

105

chamber

106

Means for preferably controllable metered addition of a fluid in partial fluid streams

200

Machine for producing a fibrous web

H

Flow direction (arrow)

M

vertical center

P

intersection

R

Axial direction (double arrow)

S

Flow direction (arrow)

T

Division width (section width)

V

Shift (double arrow)

α

cutting angle

β

Transition angle (transition area) angle (confuser, passage area)

δ

Angle (diffuser)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0633416 A1 [0002, 0005]
• DE 19949067 C1 [0005]
• EP 1591585 B1 [0005]
• EP 0633352 B1 [0006]
• DE 102008054893 [0070]
• DE 102008054894 [0070]
• DE 102008054896 [0070]
• DE 102008054897 [0070]
• DE 102008054898 [0070]
• DE 102008054899 [0070]
• DE 102009027013 [0070]
• DE 102009027721 [0070]

Claims (15)

Valve ( 1 ) for regulating a fluid flow ( 2 ), in particular one preferably in a machine ( 200 ) for producing a fibrous web, in particular a paper, board or packaging paper web, guided pulp suspension stream ( 2.1 ), comprising a hollow body ( 3 ) with a substantially at least partially rotationally symmetrical and a longitudinal axis ( 4.L ) having cavity ( 4 ), the at least one, a longitudinal axis ( 5.L ) having inlet opening ( 5 ) with an inlet channel ( 5.1 ), a variable and substantially rotationally symmetrical passage surface ( 6 ) and an outlet opening ( 7 ) with an outlet channel ( 7.1 ), and one preferably by means of at least one actuating means ( 10 ) coaxially in the cavity ( 4 ) of the hollow body ( 3 ) displaceable, the passage surface ( 6 ) as a result of a displacement (V) variable, in particular a valve disc ( 9 ) and preferably rotationally symmetrical valve rod ( 8th ), characterized in that the valve rod ( 8th ) by means of at least two at least radially acting bearing units ( 11.1 . 11.2 ) is guided with a degree of freedom in the axial direction (R) necessary for the displacement (V). Valve ( 1 ) according to claim 1, characterized in that the valve rod ( 8th ) by means of two at least radially acting bearing units ( 11.1 . 11.2 ), which has a bearing distance ( 11.A ) in the range from 2 to 12, preferably from 3 to 10, in particular from 5 to 8, · average valve stem diameter ( 8.Dm ) exhibit. Valve ( 1 ) according to claim 1 or 2, characterized in that the two at least radially acting bearing units ( 11.1 . 11.2 ) additionally as sealing units ( 11.P . 11.S ), the first, the cavity ( 4 ) of the hollow body ( 3 ) and at least radially acting bearing unit ( 11.1 ) as a wear-stressed primary seal ( 11.P ) and the second, the cavity ( 4 ) of the hollow body ( 3 ) facing away and at least radially acting bearing unit ( 11.2 ) as a follower secondary seal ( 11.S ) is trained. Valve ( 1 ) according to one of the preceding claims, characterized in that the respective at least radially acting bearing unit ( 11.1 . 11.2 ) at least one elastic outer ring ( 21 ), in particular an O-ring, a quad-ring or the like, which causes the hollow body-side seal, and a hard inner ring ( 22 ), in particular a Stepseal or the like, which causes the valve rod-side seal comprises. Valve ( 1 ) according to one of the preceding claims, characterized in that the two at least radially acting and the valve rod ( 8th ) leading storage units ( 11.1 . 11.2 ) by means of at least one guide device ( 17 ), in particular a cartridge ( 17.1 ) indirectly and at least partially in the hollow body ( 3 ) are stored. Valve ( 1 ) according to claim 5, characterized in that the guide device ( 17 ), in particular the cartridge ( 17.1 ) at least partially by means of a sealing part ( 18 ) between the hollow body ( 3 ) and one on the hollow body ( 3 ) arranged bracket ( 19 ) for the actuating means ( 10 ) is stored and preferably positioned. Valve ( 1 ) according to claim 5 or 6, characterized in that the guide device ( 17 ), in particular the cartridge ( 17.1 ) is executed fully symmetrical or approximately fully symmetrical and that the two at least radially acting and the valve rod ( 8th ) leading storage units ( 11.1 . 11.2 ) in each case in frontally mounted recesses ( 23 ), in particular open grooves are arranged. Valve ( 1 ) according to one of the preceding claims, characterized in that the guide device ( 17 ), in particular the cartridge ( 17.1 ) is designed so that a possibly occurring leakage at the cavity ( 4 ) of the hollow body ( 3 ) and at least radially acting bearing unit ( 11.1 ), in particular the wear-stressed primary seal ( 11.P ) via transverse bores ( 24 ) and / or annular grooves ( 25 ) to the outside, ie to the surface of the valve ( 8th ) is feasible. Valve ( 1 ) according to claim 8, characterized in that the guidance of possibly at the the cavity ( 4 ) of the hollow body ( 3 ) and at least radially acting bearing unit ( 11.1 ), in particular the wear-stressed primary seal ( 11.P ) occurring leakage to the surface of the valve ( 8th ) by means of at least one in the hollow body ( 3 ) and / or in a on the hollow body ( 3 ) arranged bracket ( 19 ) for the actuating means ( 10 ) and preferably closable leakage drain opening ( 20 ), in particular leakage drainage bore ( 20.1 ) he follows. Valve ( 1 ) according to one of the preceding claims, characterized in that between the two at least radially acting bearing units ( 11.1 . 11.2 ) a gap-shaped intermediate space ( 26 ) formed by means ( 27 ), in particular fats, soaps and the like for lubrication and improvement of the sealing function is filled. Valve ( 1 ) according to one of the preceding claims, characterized in that the inlet opening ( 5 ) in the hollow body ( 3 ) is arranged such that its longitudinal axis ( 5.L ) with the Longitudinal axis ( 4.L ) of the cavity ( 4 ) of the hollow body ( 3 ) at an intersection (P). Valve ( 1 ) according to claim 11, characterized in that the two intersecting in the intersection (P) longitudinal axes ( 4.L . 5.L ) have a cutting angle (α) in the range of 60 to 120 °, preferably from 80 to 100 °, in particular from 85 to 95 °. Headbox ( 100 ) for a machine ( 200 ) for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension ( 101 ), characterized in that it comprises at least one valve ( 1 ) according to one of claims 1 to 12. Headbox ( 100 ) according to claim 13, characterized in that it acts as a sectioned dilution water headbox ( 100 ) is formed with a pitch width (T) of N x 25 mm or N x 33.3 mm, where N is preferably a natural number, and that in at least one, preferably in each dilution water line at least one valve ( 1 ) is arranged according to one of claims 1 to 12. Machine ( 200 ) for producing a fibrous web, in particular a paper, board or packaging paper web, from at least one fibrous stock suspension ( 101 ), characterized in that it comprises at least one valve ( 1 ) according to one of claims 1 to 12.

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