CN114508603A - sealing valve - Google Patents

Abstract

The invention discloses a sealing valve, which comprises a valve body and a valve plate, wherein the valve body comprises a fluid passing port and a sealing surface surrounding the fluid passing port, the valve plate can move between a position for opening and closing the fluid passing port relative to the valve body, and the valve plate is matched with the sealing surface of the valve body through the side surface to realize sealing and block a fluid channel at the position for closing the fluid passing port. The sealing valve further includes an annular expansion bladder provided on the valve body corresponding to the valve body sealing surface or provided on the valve plate at a portion corresponding to the valve body sealing surface when the valve plate is in the position for closing the fluid passage port, the expansion bladder being located between the valve plate side surface and the valve body sealing surface when the valve plate is in the position for closing the fluid passage port, and being capable of charging and discharging fluid to control pressure between the expansion bladder and the valve plate side surface and the sealing surface of the valve body. The sealing valve can be closed and opened, meanwhile, the abrasion caused by direct mechanical extrusion between the sealing surfaces of the valve plate and the valve body can be avoided, the requirement of the sealing surface on the machining precision is reduced, and the machining cost is reduced.

Description

sealing valve

technical field

The invention relates to the petrochemical field, in particular to an improved sealing valve used in the petrochemical field.

Background technique

In the industrial production process of chemical, oil refining, metallurgy and electric power, there are low-pressure medium pipes such as flue gas pipes and ventilation pipes. These pipes are used to input or discharge low-pressure medium such as high-temperature flue gas and air to cooperate with the production process.

In order to open and close these pipelines, metal sealing valves suitable for high temperature are often installed in the pipelines, including the valve body and the valve plate. The sealing surface of the valve body is squeezed through the sealing surface of the valve plate to generate elastic force between them. A certain sealing specific pressure is reached to ensure the sealing of the sealing valve. Therefore, the precision of the sealing surface of the valve body and the valve plate is very high, and the processing is complicated and the cost is high, otherwise it is difficult to ensure the sealing performance. At the same time, in the prior art, during the repeated opening and closing of the sealing valve, the valve plate and the sealing surface of the valve body are rubbed and squeezed for many times, which is prone to mechanical wear, resulting in a decrease in the sealing performance between the two sealing surfaces.

Therefore, an improved sealing valve is needed to solve the above technical problems.

SUMMARY OF THE INVENTION

It is an object of the present invention to at least partially overcome the deficiencies of the prior art by providing a seal.

According to the present invention, a sealing valve is provided, comprising:

a valve body, including a valve body main body, defining a fluid passage; and a sealing surface and a fluid passage port provided in a section of the valve body main body capable of cutting off the fluid passage, the sealing face being disposed around the fluid passage aperture; and

The valve plate can move relative to the valve body between the position of opening the fluid passage port and the position of closing the fluid passage port, and in the position of closing the fluid passage port, the valve plate cooperates with the sealing surface of the valve body through the side to achieve sealing, thereby cutting off the fluid aisle,

Wherein, the sealing valve further includes an annular expansion bag, which is arranged on the valve body corresponding to the sealing surface, or is arranged on the valve plate at a portion of the valve plate that corresponds to the sealing surface when the valve plate is in the position of closing the fluid passage port. When the plate is in the position of closing the fluid passage port, the expansion bag is located between the side of the valve plate and the sealing surface of the valve body, and the expansion bag can fill and discharge fluid to control the sealing of the expansion bag, the side of the valve plate and the valve body pressure between the faces.

Preferably, the inflation bag is controlled to fill the fluid after the valve plate moves to the position of closing the fluid passage port when the fluid passage port needs to be closed, so as to enhance the pressure between the inflation bag, the valve plate and the valve body and form a seal, And before the valve plate is about to leave the position of closing the fluid passage port, the fluid is discharged to reduce the pressure between the inflation bladder and the valve plate and valve body and release the seal.

Preferably, the sealing valve further comprises a spring sheet disposed on the inner and/or outer peripheral sides of the annular shape of the inflation bag relative to the radial direction, so as to protect the inflation bag when the fluid passes through in use.

Preferably, the cross-sectional shape of the spring sheet along the radial direction of the inflation bag is a curved shape that protrudes from the fixing surface of the inflation bag and can protect the inflation bag in the radial direction.

Preferably, the spring plate is made of non-metal or metal.

Preferably, the valve plate moves in translation parallel to the sealing surface of the valve body between the position of opening the fluid passage port and the position of closing the fluid passage port, the expansion bag is arranged on the valve body, and the spring sheet is arranged at the expansion position The inner peripheral side of the annular shape of the bag with respect to the radial direction.

Preferably, the spring plate abuts or contacts the valve plate when the valve plate moves in translation, so as to guide the movement of the valve plate.

Preferably, the valve body includes sealing surfaces arranged in two sections parallel to each other, and the sealing surfaces in the two sections are respectively located on both sides of the valve plate.

Preferably, both the sealing surfaces of the two sections are provided with an inflation bag, or among the sealing surfaces in the two sections, an inflation bag is provided on the sealing surface in one section, and a valve seat is provided on the other. The valve seat abuts against the valve plate to form a seal when the valve plate is in the position of closing the fluid passage port.

Preferably, the valve seat is a metal or non-metal gasket.

Preferably, the main body of the valve body is an annular cross-section pipe, the valve body further comprises an annular recess extending radially outward from the annular cross-section pipe, and two sides of the annular recess parallel to the radial direction are defined at two parallel sides. sealing surface within a section.

Preferably, the inflation bladder is made of elastic material or metal foil.

Preferably, the sealing valve further comprises a fluid charging and discharging device, in fluid communication with the inflation bag through the fluid medium hose, for filling the inflation bag with fluid or discharging the fluid from the inflation bag via the fluid medium hose.

Preferably, the fluid medium hose is a metal hose or a rubber hose.

Preferably, the sealing valve further comprises a valve plate driving mechanism cavity, a valve plate driving device and a connecting device connecting the valve plate driving device and the valve plate, the valve plate driving mechanism cavity along the movement track of the valve plate from the valve body The main body extends outward to accommodate the movement of the valve plate therein, and a part of the connecting device sealingly protrudes into the valve plate driving mechanism cavity from the outside and is connected with the valve plate, and can be driven into and out of the valve plate driving mechanism cavity by the valve plate driving device Therefore, when the fluid passage port needs to be closed from the non-sealed state between the valve plate and the valve body, the drive connecting device enters the valve plate driving mechanism cavity, so as to move the valve plate from the position of opening the fluid passage port to the position of closing the fluid passage port , and when the fluid passage port needs to be opened by the sealing state between the valve plate and the valve body, the drive connecting device moves outward from the valve plate drive mechanism cavity, so as to move the valve plate away from the position of closing the fluid passage port to open the fluid passage mouth.

According to the sealing valve of the present invention, the pressure between the expansion bag and the side surface of the valve plate and the sealing surface of the valve body is controlled by filling and discharging the fluid through the annular expansion bag arranged between the side surface of the valve plate and the sealing surface of the valve body, so as to realize The closing and opening of the sealing valve, while avoiding the wear caused by the direct mechanical extrusion between the valve plate and the sealing surface of the valve body, reducing the requirements for the processing accuracy of the sealing surface and reducing the processing cost.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

1 is a front view of a sealing valve in a closed state according to one embodiment of the present invention;

Fig. 2 is a partial cross-sectional side view of the sealing valve shown in Fig. 1;

Figure 3 is a cross-sectional view taken along section A-A shown in Figure 1;

Figure 4 is a front view of the sealing valve of the embodiment shown in Figure 1 in an open state;

5 is a front view of a sealing valve in a closed state according to another embodiment of the present invention.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the invention are shown in the drawings.

The sealing valve involved in the present invention includes a valve body and a valve plate. The valve body includes a valve body main body defining a fluid passage, a sealing surface and a fluid passage port provided in the section of the valve body main body capable of cutting off the fluid passage, and the sealing surface is arranged around the fluid passage aperture. The valve plate can move relative to the valve body between the position of opening the fluid passage port and the position of closing the fluid passage port, and in the position of closing the fluid passage port, the valve plate cooperates with the sealing surface of the valve body through the side to realize the sealing of the sealing valve, thereby The fluid passage is blocked, and the sides of the valve plate thus serve as the sealing surface of the valve plate.

The section of the valve body main body that can cut off the fluid passage can be arranged perpendicular to the axial direction of the fluid passage, or can be arranged obliquely at an angle to the axial direction of the fluid passage.

The improvement of the sealing valve of the present invention is that it further comprises an annular expansion bag, which is arranged on the valve body corresponding to the sealing surface of the valve body, or is arranged on the valve plate and is in contact with the valve body when the valve plate is in the position of closing the fluid passage port. at the corresponding part of the sealing surface. When the valve plate is in the position of closing the fluid passage port, the expansion bag is located between the side of the valve plate and the sealing surface of the valve body. The expansion bag can fill and discharge fluid to control the relationship between the expansion bag and the side of the valve plate and the sealing surface of the valve body. pressure between.

The expansion bag can fill and discharge fluid. When the expansion bag is filled with fluid, the expansion bag expands, so that a uniform pressing force is generated between the side of the valve plate and the sealing surface of the valve body, and the pressing force reaches a certain sealing specific pressure. When the sealing valve is sealed. When there is no need to seal the valve, the inflation bag can discharge fluid, so that the pressure between the side of the valve plate and the sealing surface of the valve body is reduced, and even the inflation bag is out of contact with the side of the valve plate or the sealing surface of the valve body. This releases the seal between the valve plate and the valve body.

In this way, the sealing of the sealing valve can be achieved without direct mechanical extrusion between the valve plate and the sealing surface of the valve body, thereby reducing the precision requirement of the sealing surface and reducing the processing cost.

The inflation bag can also preferably be controlled to fill the fluid after the valve plate moves to the position of closing the fluid passage port when the fluid passage port needs to be closed, so as to enhance the pressure between the inflation bag and the valve plate and the valve body and form a seal, and Just before the valve plate leaves the position to close the fluid passage port, the fluid is drained to reduce the pressure between the inflation bladder and the valve plate and valve body and to release the seal.

In this way, the relative movement of the valve plate and the sealing surface of the valve body can be further avoided when there is a large pressure therebetween, thereby further avoiding the mechanical wear between the valve plate and the sealing surface of the valve body due to friction under high pressure. .

Various types of sealing valves are suitable for this principle of the present invention, including, for example, gate valves that open and close the valve body by moving the side of the valve plate in parallel with the sealing surface of the valve body, by moving the side of the valve plate away and closer to the sealing surface of the valve body. Butterfly valve or telescopic stem sealing valve that moves to open and close the valve body, and other types of sealing valve that achieve sealing through the cooperation of the side of the valve plate and the sealing surface of the valve body.

When the sealing valve according to the present invention is a gate valve, the valve plate may be a single valve plate or two valve plates in half, and the fluid passage port may be one or more valve plates provided in a section capable of cutting off the fluid passage. When the fluid passes through the port, the valve plate can be sealed with the sealing surface of the valve body by one side, or can be sealed with the sealing surface of the valve body on both sides of the valve plate at the same time by the double side.

When the sealing valve according to the present invention is a butterfly valve or a telescopic rod sealing valve, the fluid passage port may be one or more fluid passage ports provided in a section capable of cutting off the fluid passage, and the valve plate may correspond to the fluid passage port. Set to one or more.

The present invention will be described in more detail below with reference to specific embodiments of gate valves shown in the accompanying drawings.

1 is a front view of a sealing valve in a closed state according to one embodiment of the present invention, FIG. 2 is a partial cross-sectional side view of the sealing valve shown in FIG. 1 ; and FIG. 3 is taken along section A-A shown in FIG. 1 4 is a front view of the sealing valve of the embodiment shown in FIG. 1 in an open state.

Referring to FIGS. 1-4 , the sealing valve is generally designated by reference numeral 1 and includes a valve body 11 and a valve plate 12 . The valve body 11 includes a valve body body 111 defining a fluid passage. It can be seen in conjunction with FIG. 1 and FIG. 2 that the valve body main body 111 is a pipe with an annular section, and the annular section is a rectangular annular section. With further reference to FIG. 3 , it can be seen more clearly that the valve body 11 also includes an annular recess 114 extending radially outwardly from the annular cross-sectional conduit defined by the valve body body 111 , the two annular recesses 114 of which are parallel to the radial direction. The sides define a sealing surface 112 in two parallel sections, and the sealing surface 112 is provided around the fluid passage port 113 . The sealing valve 1 further includes an annular expansion bag 13 , which is disposed on the valve body 11 corresponding to the sealing surface 112 of the valve body 11 . In the position of closing the fluid passage port 113 shown in FIG. 3 , the valve plate 12 achieves sealing through the cooperation of the side via the annular expansion bag 13 with the sealing surface 112 of the valve body 11 , thereby blocking the fluid passage defined by the valve body body 11 .

1 , 2 and 4 , it can be seen that the sealing valve 1 further includes a valve plate driving mechanism cavity 17 , a valve plate driving device 19 and a connecting device 18 connecting the valve plate driving device 19 and the valve plate 12 . The valve plate driving mechanism cavity 17 extends outward from the valve body main body 111 along the movement track of the valve plate 12 to accommodate the valve plate 12 to move therein. A part of the connecting device 18 sealingly protrudes into the valve plate driving mechanism cavity 17 from the outside, and is connected with the valve plate 12, and can be driven in and out of the valve plate driving mechanism cavity 17 by the valve plate driving device 19, thereby driving the valve The plate 12 moves relative to the valve body 11 between a position shown in FIG. 4 to open the fluid passage port 113 and a position shown in FIG. 1 to close the fluid passage port 113 .

When it is necessary to switch from the open state of the sealing valve shown in FIG. 4 , that is, the non-sealing state between the valve plate 12 and the valve body 11 and the opening of the fluid passage port 113 , to the state of the sealing valve 1 shown in FIG. 1 . When the sealing state of the valve plate 12 and the valve body 11 is sealed, the fluid passage port 113 is closed and the fluid passage port 113 is opened, the valve plate driving device 19 drives the connecting device 18 into the valve plate driving mechanism cavity 17, thereby The valve plate 12 is moved in translation parallel to the sealing surface 112 of the valve body 11, and when it is necessary to switch from the sealing state of the sealing valve shown in FIG. 1 to the open state of the sealing valve shown in FIG. 4, The connecting device 18 is driven outwardly from the valve plate driving mechanism cavity 17 by the valve plate driving device 19 to move the valve plate 12 away from the position closing the fluid passage port 113 to open the fluid passage port 113 .

Further referring to FIG. 3 , it can be seen that in this embodiment, the sealing surfaces 112 of the valve body 11 defined in the two cross-sections parallel to each other defined by the annular recess 114 of the valve body 11 are located on both sides of the valve plate 12 respectively, and seal the valve 1. Two annular expansion bladders 13 corresponding to the two sealing surfaces 112 of the valve body 11 are provided, whereby the two side surfaces of the valve body 11 are respectively matched with the corresponding sealing surfaces 112 of the valve body 11 via the corresponding annular expansion bladders 13 to achieve sealing.

Furthermore, as shown in FIG. 3 , the sealing valve 1 further includes a spring piece 14 provided on the inner peripheral side of the annular shape of the inflation bag 13 with respect to the radial direction, so as to protect the inflation bag 13 when the fluid passes through in use. The cross-sectional shape of the spring sheet 14 along the radial direction of the inflation bag 13 is such that it protrudes from the fixing surface of the inflation bag 13 (the sealing surface 112 of the valve body 11 in this embodiment) and can protect the inflation bag 13 from bending in the radial direction. The shape is, for example, the curved arc shape shown in the figure, so as to avoid the influence of the thermal effect of the fluid medium or other chemical effects on the elastic expansion bag 13 when the sealing valve 1 is in use. Preferably, the spring piece 14 abuts against or contacts the valve plate 12 when the valve plate 12 moves in translation. For example, as shown in the figure, the spring piece 14 has a circular arc inflection point at the extended end, and the circular arc inflection point approaches or contacts the valve to the greatest extent. Plate 12, so as to minimize the influence of the thermal effect of the fluid medium or other chemical effects on the elastic expansion bladder 13, and at the same time, the movement of the valve plate 12 can be restricted during the translational movement of the valve plate 12 to open or close the sealing valve 1 track to avoid jamming failure and play a guiding role. 1, the bending direction of the spring sheet 14 is preferably set to bend from the sealing surface 112 of the valve body 11 toward the valve plate 12 along the moving direction of closing the fluid passage port 113, so as to facilitate the receiving of the valve plate 12 on the valve plate 12. Between the two curved spring pieces 14 to guide the movement of the valve plate 12 .

It can also be seen from FIG. 3 and in conjunction with FIGS. 1 , 2 and 4 that the sealing valve 1 further comprises a fluid charging and discharging device 15 , which is in fluid communication with the inflation bladder 13 through the fluid medium hose 16 , for passing through the fluid medium hose 16 . The inflation bladder 13 is filled with fluid or discharged from the inflation bladder 13 . The fluid charging and discharging device 15 can be used to inflate, regulate, maintain, release and evacuate the inflation bladder 13 as required, and can be implemented as a fluid-only device, a fluid-filling device and a gas-extracting device combination, and the like.

The specific embodiments of the sealing valve according to the present invention have been described above with reference to FIGS. 1 to 4 . The sealing valve of the present invention is not limited to those shown in the figures, and can also have the following various deformation forms.

In this embodiment, since the side surface of the valve plate 12 moves in parallel with respect to the sealing surface 112 of the valve body 1 , the expansion bag 13 of the sealing valve 1 is preferably controlled so that when the fluid passage port 113 needs to be closed, the valve plate 12 is driven by the valve plate. After the device 19 is driven to the position where the fluid passage port 113 is closed, the fluid is filled again, so that the inflation bag 13 is axially stretched against the valve plate 12 along the fluid channel, and the sealing between the inflation bag 13 and the side surface of the valve plate 12 and the valve body 11 is enhanced. The pressure between the surfaces 112 and form a seal to achieve the closing or cut-off of the sealing valve 1, and before the valve plate 12 is about to leave the position of closing the fluid passage port 113, the fluid is discharged, and even the fluid is evacuated, so as to reduce the amount of the inflation bladder 13 and the fluid. The pressure between the valve plate 12 and the valve body 11 increases the distance between the expansion bag 13 and the valve plate 12 until they are out of contact, releasing the seal, and then the valve plate driving device 19 outputs the action through the valve plate connecting device 18 to drive the valve plate 12 produces a reverse displacement, so that it leaves the valve body 11 and is located in the cavity 17 of the valve plate driving mechanism to realize the opening of the sealing valve 1, thereby reducing or even avoiding the side of the valve plate 12 and the sealing surface 112 of the valve body 11. Mechanical wear during relative movement.

The inflation bladder 13 in the sealing valve according to the present invention can be made of elastic material such as rubber, or can be made of folded metal foil, which expands and expands when filling with fluid, and folds and contracts when discharging fluid. Inflatable bladders made of metal foil are suitable for higher operating temperatures. The fluid medium hose 16 can also use a metal hose or a rubber hose according to the working temperature, and can realize movements such as deformation and twisting.

In the above embodiment, since the expansion bag 13 is arranged on the sealing surface 112 of the valve body 11 , the spring sheet 14 is arranged on the inner peripheral side of the annular shape of the expansion bag 13 relative to the radial direction to realize the protection of the expansion bag 13 . The arrangement of the inflation bladder 13 and the spring plate 14 of the sealing valve according to the present invention is not limited to this. The inflation bladder 13 may also be provided at a portion of the valve plate 12 corresponding to the sealing surface 112 when the valve plate 12 is in a position where the fluid passage port 13 is closed, and in this case, since the inflation bladder 13 moves with the valve plate 12 , it expands When the fluid passes through the fluid channel, the bladder 13 will be in contact with the fluid in multiple directions, and the spring pieces 14 are preferably arranged on the inner and outer circumferential sides of the annular shape of the inflation bladder 13 relative to the radial direction, so as to protect the inflation bladder 13 . Thus, the leaf spring 14 is positioned according to the type of sealing valve 1 and the relative position of the inflation bladder 13 to the fluid in use. The shape of the spring plate 14 can also be set according to the type of the sealing valve 1 and the relative movement of the valve plate 12 and the valve body 11. The relative movement of the valve plate 14 is approaching or moving away, so the spring sheet 14 only needs to consider the protection function of the inflation bag 13, but does not need to consider the guiding function of the movement of the valve plate 12.

In addition, the sealing surface 112 of the valve body 11 of the sealing valve 1 according to the present invention does not necessarily have to be realized as an annular recess extending radially outward from the annular cross-section pipe shown in FIGS. 1-4 , but can be realized in various ways, such as Implemented as an annular sealing surface extending radially inward from the annular cross-section duct. The annular cross-section pipe is also not limited to the rectangular pipe shown in the figures, and can be pipes of other shapes. The shape of the annular expansion bag is therefore also determined by the shape of the annular sealing surface provided on the annular section pipe.

5 is a front view of a sealing valve in a closed state according to another embodiment of the present invention. Components in Fig. 5 that are the same as or similar to those in Figs. 1-4 are designated with the same reference numerals, and the reference numerals are followed by the symbol "'" for distinction.

The difference between the embodiment shown in FIG. 5 and the embodiment shown in FIGS. 1 to 4 is that only one sealing surface 112 ′ of the annular recess 114 ′ of the valve body 11 ′ is provided with an annular expansion bag 13 ′, and the other sealing A valve seat 10' is provided on the surface of the valve plate. When the valve plate 12' is in the position of closing the fluid passage port 113', the valve seat 10' pushes the valve plate 12', and fills the annular expansion bag 13' with fluid, and the valve plate 10' 12' is provided with the side surface of the inflation bag 13', the sealing surface 112' of the valve body 11' facing the inflation bag 13', and the annular inflation bag 13' therebetween to achieve a certain sealing specific pressure, while the valve plate 12' and The opposite side of the inflation bag 13 ′ and the sealing surface of the annular recess 114 ′ facing the valve seat 10 ′ press against the elastic valve seat 10 ′ to form the sealing of the sealing valve 1 ′. The valve seat 10' is an elastic metallic or non-metallic gasket.

The other structure of the embodiment of the sealing valve shown in FIG. 5 is completely the same as that of the embodiment of the sealing valve shown in FIG. 1 to FIG. 4 , and the description is not repeated here.

The sealing valve 1 and the sealing valve 1' shown in Figures 1-4 and Figure 5 are installed vertically, that is, the valve plate 12 and the valve plate 12' move up and down in the vertical direction to open and close the sealing valve. The sealing valve of the present invention is not limited to the installation shown, but can also be installed horizontally. In the case of vertical installation, the valve plate driving device can be connected to the valve plate through flexible connecting devices, such as wire ropes, chains or hinges, etc., or through rigid connecting devices, such as lead screws, racks, rigid shafts, etc. to drive the valve plate. Moving up and down. In the case of horizontal installation, the valve plate driving device is preferably connected to the valve plate through a rigid connecting device, such as a lead screw, a rack, a rigid shaft, etc., to drive the valve plate to move horizontally.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover the above technical features without departing from the inventive concept. Other technical solutions formed by any combination of its equivalent features. For example, a technical solution is formed by replacing the above-mentioned features with the technical features disclosed in this application (but not limited to) with similar functions.

Claims (15)

1. A sealing valve comprising:

a valve body including a valve body defining a fluid passage; and a sealing surface and a fluid passage opening which are arranged in the cross section of the valve body main body and can cut off the fluid passage, wherein the sealing surface is arranged around the fluid passage opening; and

a valve plate movable relative to the valve body between an open fluid passage port position and a closed fluid passage port position, and in the closed fluid passage port position, the valve plate achieving sealing by side surface engagement with a sealing surface of the valve body to thereby intercept the fluid passage,

the sealing valve also comprises an annular expansion bag which is arranged on the valve body corresponding to the sealing surface or is arranged on the valve plate at a part corresponding to the sealing surface when the valve plate is at the position for closing the fluid passing port, and the expansion bag is positioned between the side surface of the valve plate and the sealing surface of the valve body when the valve plate is at the position for closing the fluid passing port and can be filled with and discharged with fluid so as to control the pressure between the expansion bag and the side surface of the valve plate and the sealing surface of the valve body.

2. The sealing valve according to claim 1, wherein said expansion bladder is controlled to be inflated with fluid after the valve plate is moved to a closed fluid passage port position to increase the pressure between the expansion bladder and the valve plate and valve body and form a seal when it is desired to close the fluid passage port, and to be deflated before the valve plate is about to move away from the closed fluid passage port position to decrease the pressure between the expansion bladder and the valve plate and valve body and release the seal.

3. The sealing valve according to claim 1 or 2, wherein said sealing valve further comprises a leaf spring provided on the inner and/or outer circumferential side, with respect to the radial direction, of the annular shape of the expansion bladder to shield the expansion bladder when the fluid passes through in use.

4. The sealing valve according to claim 3, wherein said spring leaf has a cross-sectional shape in the radial direction of the expansion bladder that is a curved shape protruding from the expansion bladder fixation surface and capable of shielding the expansion bladder in the radial direction.

5. The sealing valve according to claim 3 or 4, wherein said spring plate is made of non-metal or metal.

6. The sealing valve according to any one of claims 3-5, wherein said valve plate is translationally movable parallel to the sealing surface of said valve body between an open fluid passage port position and a closed fluid passage port position, said expansion bladder being provided on the valve body, said spring leaf being provided on the radially inner peripheral side of the annular shape of the expansion bladder.

7. The sealing valve according to claim 6, wherein said spring leaf abuts or contacts the valve plate upon translational movement thereof to guide the valve plate to move.

8. The sealing valve according to claim 6 or 7, wherein said valve body comprises sealing surfaces arranged in two sections parallel to each other, the sealing surfaces in the two sections being located on either side of the valve plate.

9. The sealing valve according to claim 8, wherein the sealing surfaces on both sections are provided with an expansion bladder, or wherein the sealing surface in one of said sections is provided with an expansion bladder and the other is provided with a valve seat which forms a seal against the valve plate in the position in which it is in the closed fluid passage opening.

10. A sealing valve according to claim 9, wherein said valve seat is a metal or non-metal washer.

11. The sealing valve according to any one of claims 8-10, wherein said valve body is an annular section tube, said valve body further comprising an annular recess extending radially outwardly from the annular section tube, two sides of the annular recess parallel to the radial direction defining sealing surfaces in the two parallel sections.

12. The sealing valve according to any one of claims 1-11, wherein said expansion bladder is made of an elastic material or a metal foil.

13. A sealing valve according to any one of claims 1-11, wherein said sealing valve further comprises a fluid charging and discharging device in fluid communication with the inflatable bladder through a fluid medium hose for charging or discharging fluid to or from the inflatable bladder via the fluid medium hose.

14. The sealing valve according to claim 13, wherein said fluid medium hose is a metal hose or a rubber hose.

15. The sealing valve according to any one of claims 6-11, wherein said sealing valve further comprises a valve plate drive mechanism chamber extending outwardly from the valve body along a trajectory of movement of the valve plate to accommodate movement of the valve plate therein, valve plate drive means and connection means connecting the valve plate drive means to the valve plate, a portion of the connection means sealingly protruding into the valve plate drive mechanism chamber from the exterior and being connected to the valve plate, access to the valve plate drive mechanism chamber being drivable by the valve plate drive means, whereby on a need to close the fluid passage port from an unsealed state between the valve plate and the valve body, the connection means is driven into the valve plate drive mechanism chamber to move the valve plate from an open fluid passage port position to a closed fluid passage port position and on a need to open the fluid passage port by the sealed state of the valve plate to the valve body, the drive linkage moves outwardly from the valve plate drive mechanism cavity to move the valve plate away from closing the fluid passage port to open the fluid passage port.

Images