US1627997A - Duplex throttle valve - Google Patents

Description

May 10, 1927. 1,627,997

F. N. POIGNAND DUPLEX THROTTLE VALVE Filed April 20, 1926 2 Sheets-Sheet 1 INVENTOR fi'flla 'yreand- BY 9 I S ATTORN EY 1,627,997 y 1927' F. N. POIGNAND DUPLEX THROTTLE VALVE Filed April 20. 1926 2 S heQtS-Sheet 2 INVE-INTOR Pa yraznd 9 BY g ATTORNEY Patented May 10, 1927. I

UNITED STATES 1,527,997- PATENT OFFICE.

runners NESBITT rom'nann, or wEs'rr-IELn, NEW mnsmr, Assionon, BY imam: ASSIGNIENTB, 'ro SUPER-GAS CORPORATION, 01 wILnmc'roN, DELAWARE, A

CORPORATION OF DELAWARE.

' DUPLEX THROTTLE Application and April :0, me. Serial Io. 103,390.

The inain object of the present invention is to providean eflicientand reliable valve device adapted to automatically maintain a desired fluid pressure by admitting fluid from a low pressure source as it is needed and by admitting fluid from a high pressure source when the pressure of the fluid from the low pressure source falls below that which it is required to maintain.

Another objectof the invent-ion is to provide an automatic duplex throttle valve adapted to automatically maintain a flow of steam at a predetermined, low pressure, and to receive steam for this purpose from a low pressure source and from a high pressure source. Under normal conditions the valve isv adapted to admit steam from the low pressure source. If the pressure from thls low pressure source drops below a predeter- 2 mined point the valve is ada ted to automatically admit suflicient high pressure steam to maintain. the desired low pressure flow. The valve is capable of adjustmentfor maintaining different degrees of pressure.

A further object of the invent-ion is to provide a duplex pressure maintaining valve which is adapted to be easily adjusted for maintaining different degrees of fluid pres-" sure.

Other objects of the invention will appear hereinafter.

In the drawings:

Fig. 1 is a sectional view of the valve device showing the arts in a position to admit low pressure fluid v Fig. 2 a sectional ,vievvi'; showing the operation of the valve device ,to shut off the fluid delivery;

Fig. 3 a sectional view vice showing the-parts-in high pressure fluid; and

i i aj a d Fig. 4 a top plan viewofvtheuvalve device. Referring to the varlousl'fparts by n m erals, the valve device com r1's'e's. a-casmg 1,

formed with an inlet cham er '2 and an out; let chamber 3. The casing is formed at one side with'a low pressure inlet 4 which leads into the chamber 2. This inlet is adapted to be connected to a source of steam or other fluid under low pressure. Atits opposite side the casing is formed with an outlet 5 whiclrleads from the chamber 3. The outlet is adapted to be connected with the point he valve de- 19' when t Whenthe valve iskin its lowermost the flanges'17 close the openings in t e walls at which the constant pressure is required. Above the inlet chamber 2 the valve casing is formed with a vertically disposed cylinder 6 and with a passage 7 leadin downwardly from the bottom of said cylinder to the chamber 2. An inlet 0 ening 8 is formed in one side of the cylin er 6 midway the height thereof. nected a supply pipe 9 which leads into the opening 8. This pipe connects with a source of steam or other fluid under high pressure. Above the outlet chamber 3 the valve casing is formed with a vertically disposed cylinder 10 of much less hei ht than the cylinder 6. The lower end of t e cylinder 10 opens directlyinto the chamber 3 and its upper end is closed by an end late 11. The upper end of the larger cylinder 6 is closed by an elongated horizontal plate 12 which is removabl secured at one end to the upper end of t e cylinder 6 by bolts or screws 13, and ad'acent its opposite end is removably secure b bolts 14 to an upstanding bracket 15 fbrmed upon the valve casin y A eed valve 16 is provided for controlling communication between the inlet chamber 2 and the outlet chamber 3. The valve 16 is in the form of a, hollow cylinder 0 en at- -both ends and formed with outwar ly extending peripheral flanges 17 at its ends.

I fiangesand guide them for vertical movementJflj-Formed upon; the valve 16, below.

the aaa es gu are guide ribs 20 adapted to eli'gagein the guide openings of the walls 18 v e valve is moved upwardly to carry, the flanges out of said openings. In

"this positionfof thfiggglve the inlet chamber 2 is platc1411 eon mifnication with the outlet chamber 3; and tlieva'lve issaid to be open.

18 and 19 to shutoff communication between the chambers 2 and 3 and the valve is said to be closed. The valve is centrally formed with webs 21 which support an operating stem 22. The stem extends upwardly To the casing is conosition through an opening in a horizontal wall 23 formed in the casing and spaced above the wall 18. The upper end of the stem has a pin-and-slot pivotal connection with a lever 24 located Within the outlet chamber 3 and fulcrumed upon an car 25 carried by the casing. The opposite end of the lever 24 has a pin-and-slotpivotal connection with an ear 26 which depends from a pressure control piston 27 fitted within the short cylinder 10. The arms of the lever are of equal length.

Within the cylinder 6 is a high pressure control valve 28 formed with spaced piston heads 29 which slidably fit within the cylin der. Between the under side of the valve 28 and the bottom wall of the cylinder is a coiled compression spring 30 which tends to force the valve upwardly against the upper end plate 12 of the cylinder. The valve is so proportioned that in all of its vertical positions the space between its piston heads 29 will be in communication with the high pressure inlet 8. The valve casing l is formed in one side with a passage 31. This passage leads from the cylinder 6, at a point below the inlet 8, downwardly to the space between the horizontal walls 18 and 23, above the valve 16. In the upper position of the valve 28 the upper end of the passage 31 is below the lower piston head of the valve and is uncovered. In the lowermost position of the valve 28 its lower piston head is disposed below the entrance of the passage 31 and said passage is then connected to the inlet passage 8 through the space between the piston heads 28. This is the open position of the valve.

The piston 27 is provided with an operating stem 32 which extends upwardly through an opening in the cylinder end 11 and through a guide opening in the plate 12. The high pressure valve 28 is also provided with an operating stem 33 which extends upwardly through an opening in the plate 12. Formed upon the plate 12, midway between the stems 32 and 33, are two spaced upstanding ears 34 having vertically extending slots 35. A lever 36 is located between the cars 34 and fulcrumed upon a pin 37 extending between the ears and having its ends slidably fitted in the slots 35. The arms of the lever 36mm of equal length and its opposite ends bear respectively upon the stems 32 and 33. A. lever 38 is slidably and pivotally connected to the pin 37. This lever is forked at one end to straddle the two ears 34 and the legs 39 of the fork are formed with longitudinally extendingslots 40 through which the projecting ends of the pin 37 extend. The free ends of the fork arms 39 are pivoted or fulcrumed as at 41 to an adjustable cross head 42. The cross head extends transversely across the upper surface of the plate 12 and its opposite ends are slidably supported by guide rods 43. The rods 43 are rigidly supported slightly elevated above the plate 12 by upstanding ears 44 and by a transversely extending bracket 45 carried by the plate 12. An adjusting screw stem 46 extends inwardly from the bracket 45 parallel to the guide rods 43 and threaded through the cross head 42. The outer end of the adjusting screw is provided with a fork 47 to which an operating member may be connected. The screw is mounted to turn within a bearing opening in the bracket 45 but is held against endwise movement. The free end of the lever 38 extends outwardly from the fork beyond the valve casing and has a weight 47 mounted upon it.

A check valve 49 for closing the low pressure inlet is slidabl mounted upon a stem 50 supported by t 1e casing. This check valve is normally held open by a spring 51, and when closed against the resistance of the spring it is adapted to seat against the end of a bushing 52 fitted within the inlet. The valve casing is enlarged adjacent the inlet to accommodate the check valve and the lower side of said enlarged portion is formed with a drain opening normally closed by a threaded plug 53. Directly beneath the valve 16 the lower wall of the valve casing is formed with an opening through which said valve is inserted. This opening is closed by a removal plate. Tapped into a threaded opening in the casing located just above the plate 54 is a nozzle 55 normally closed by a cap 56. In case of a failure in the supply of fluid through the inlet 4 and 'the pipe 9, a supply may be admitted from another source through this nozzle.

Fig. 1 of the drawings shows the positions of the various parts when the check valve 49 and the feed valve are both open to admit fluid at low pressure through the inlet 4; into the chamber 2, past the feed valve, into the chamber 5 and thence to the point where the fluid is needed. The hollow valve 16, the passages 7 and 31 and the space within the cylinder 6 below the valve 28, all form in effect part of the inlet chamber 2. The high pressure valve 28 is therefore always subject to the pressure in the chamber 2. In Fig. 1, this pressure, combined with .the pressure of the spring 30, is holding the high pressure valve in its-upper or closed position against the resistance of the weight 48. The piston 27 which operates the feed valve is held in its lower position by the weight 48 acting through the levers 38 and 36 and the stem 32, and the feed valve is held open. When sufiicient pressure builds up in the chamber 3 to overcome the resistance of the weight the piston 27 is forced up to rock the lever 24 and move the feed valve 16 down to closed position as shown in Fig. 2. Upon a drop in pressure within the chamber 3 the weight 48 will automatically again move the piston down to reopen the feed valve 16 and re-build the pressure.

iii)

memo? If the pressure su lied through the low pressure inlet 4 shou d drop below the pressure required in chamber 3, the welght 48 will overcome the diminished pressure in the cylinder 6 and the resistance of the spring 30 and force the high pressure valve 28 down to open position as shown in Fig. 3. High pressure fluid then enters the cylinder 6, between the iston heads 29 of the valve, flows through t e passage 31 into the chamber 2 and past the feed valve 16' to the constant pressure chamber 3. lVhen the pressure builds up sufliciently the piston 27 closes the feed valve against the weight resistance and retains the high'pressure in the v chamber 2. When the high pressure fluidfirst enters the chamber 2 it immediately closes the check valve 49 and prevents the fluid from escaping through the low pres sure inlet 4.

The weight 48 and the ad ustment of the lever 38 determine the degree of pressure maintained in the chamber 3. By shifting the cross head 42 inwardly the lever 38 is moved longitudinally and its fulcrum is moved inwardly toward the pin 37, which is the point of load application. The mechanical advantage of the weight is increased by this adjustmentand it will resist a greater fluid pressure upon the valves. To maintain a lower pressure the cross head 42 is moved outwardly to slide the lever over the pin and shift the fulcrum away from the point of load application. The levers are so designed and arranged as to render it extremely easy to make these ad ustments. The adjustment may bemade from a point located a considerable distance from the valve by means of a reach rod or other connection with the adjusting screw 46 of the fulcrum cross head. \Vhat I claim is:

l. A valve casing formed with an inlet chamber and an outlet chamber, the inlet chamber being provided with a low-pressure inlet and with a high-pressure inlet; a feed valve controlling communication between said two chambers; means operating to close the feed valve when a predetermined degreeof fluid pressure is in the outlet chamber; a high-pressure valve controlling communication between the high-pressure inlet and the inlet chamber; and means to impose equal pressures on the feed valve and on the high-pressure valve tendin'gto open said valves, said pressure-imposing means opening the high-pressure valve and the feed valve when" the pressures in the two chambers fall below the valve-opening pressure.

2. A valve casing formed with an inlet chamber and an outlet chamber, the inlet chamber being provided with a low-pressure inlet and wlth a high-pressure inlet; a feed valve controlling communication between said two chambers; means operating to close the feed valve when a predetermined degree the inlet chamber; means to impose equal pressures on the feed valve and on the highpressure valve tending to open said valves,

'srid pressure-imposingmeans opening the high-pressure valve and the feed valve when the pressures in the two chambers fall below the valve-opening pressure; and adjustable 'means for varying the valve-opening pressure.

A valve casing formed with an inlet chamber and an outlet chamber the inlet chamber being provided with a low pressure fluid inlet; a feed valve controlling communication between said two chambers, a high pressure fluid connection; a valve adapted to be opened to supply high pressure fluid from said connection to the outlet chamber; means to automatically close the feed valve when a predetermined fluid pressure is built up in the outlet chamber; weighted means tending to open both of said valves, the opening of the valvesbeing resisted by the fluid pressure in the valve casing; and a check valve adapted to prevent the escape of high pressure fluid through the --lo\v pressure inlet; the said weighted means being adapted to open'the high pressure valve when the pressure in the outlet chamber falls below the pressure at which the feed. valve is opened.

Hill

' 4. A valve casing formed with an inlet chamber and an outlet chamber, the inlet chamber being provided with a low pressure inlet; a normally open feed valve controlling communication between said two chambers; means operated by the fluid pressure in the outlet chamber to automatically close the feed valve when said pressure reaches a certain degree; a high pressure fluid sup ply connection; a high pressure valve controlling communication between said sup ply connection and the inlet chamber; mean's tending constantly to open both of said valves, the opening of the valves being resisted by the fluid pressure in the inlet and outlet chambers and the said valve opening chamber being provided with a low pressure fluid inlet; a feel valve to control communication between said two chambers; means operated by the fluid pressure in the outlet chamber to close the said feed valve when said pressure reaches a certain point;

a high pressure fluid supply connection; a

high pressure. valve adapted tobe opened to supply fluid from said connection to the outlet chamber; a weighted lever havlng a shiftable fulcrum; operative connections be-' tween the lever and the said two valves casing and the lever being adapted to open the high pressure valve when the pressure p in the outlet chamber falls a predetermined degree below the pressure at which the-feed valveis opened; and means adapted to prevent an escape of high the low pressure inlet.

6. A valve casing; two valves within said casing adapted to control the admission of fluid from diflerent sources and provided pressure fluid through with upwardly extending perating stems;

a floating lever of the first class having its opposite ends operatively engaging said valve stems; a fulcrum mounting for the lever adapted to permit vertical shifting of the fulcrum; a valve-opening lever of the second class; a sluftable fulcrum mounting for the valve 0 enin lever a load connection between the valve-opening lever and the fulcrum of the floating lever adapted to permit the valve-opening lever to slide to said fulcrum; free end of the longitudinally relatively a. .weight carried by tie valve opening lever; and adjustment means to shift the fulcrum of the valve opening lever and slide the lever across the fulcrum of the floating lever to vary the mechanical advantage ofthe weight, the said weight tending to depress the two levers against the rdsistance of fluid pressure within: the valve casing and the floatinglever adapting saidvalves to be opened independently of eachiother against the weight resistance.

7. A valve casing formed with an inlet chamber and an outlet cha-mber,the inlet chamber being provided with a low-pressure inlet and with a high-pressure inlet; a feed valve controlling communication be tween said two chambers; means operating to close the feed valve when a predetermined degree of fluid pressure is in the outlet chamber; a high-pressure valve controlling communication between the high-pressure inlet and the inlet chamber; and means toimpose equal on the high-pressure valve tending to open said valves, the pressure tending to open the feed valve be ng o posed by the pres sure in the outlet cham er and the pressure tending to open the high pressure valve being opposed by the pressure in the inlet pressures on the feed valve and chamber, said pressure-imposing means opening the feed valve when the pressure in the outlet chamber is belowthe valveopening pressure and opening the high-pres surevalve when the pressure in' the inlet chamber is below the valve-opening pressure. a

8. A valve casing formed with an inlet controlling communication between the highpres sureinlet and the inlet chamber; and, means to impose pressures on the feed valve and on the high-pressure valve tending to open said valves, the pressure tending to open the feed valve being opposed by the pressure in the outlet chamber and the pressure tending to open the high-pressure valve being opposed by the pressure in the inlet chamber, said pressure-imposing means opening the feed valve when the pressure in the outlet chamber is below the valveopening pressure and opening the high-pressure valve when the pressure in the inlet chamber is below the valve-opening pressure.-

'9. A valve casing formed -with an inlet chamber and an outlet'chamber, the inlet chamber being provided with a low-pressure inlet and with a high-pressure inlet; a feed valve controlling communication between said two chambers; means operating to close the feed valve when a predetermined degree of fluid pressure is in the outlet chamber; a high-pressurevalve controlling communication between the high-pressure inlet and the inlet chamber; means to impose equal pressures on the feed valve andon the high-pressure valve tending to open said valves, the pressure tending to open the feed valve being opposed by the pressure in the outlet chamber and the pressure tending to open the high-pressure valve being opposed by the pressure in the inlet chamber, said pressure-imposing means opening the feed valve whenthe pressure in the outlet chamber is' below the valve-opening pressure and opening the high-pressure valve when the pressure in the'inlet chamber is below the valve-opening pressure; and adjustable means for varying the valveopening pressure.

10. A valve casing formed with an'jnlet chamber and an outlet chamber, the inlet chamber being provided'with a low-pressure inlet and with valve controlling communication between said two chambers; means operating to close the feed valve when a predetermined degree of fluid pressure is in the outlet chamber;

a high-pressure inlet; a feed a high-pressure valve controlling communication between the high pressure inlet and the inlet chamber; means to impose equal pressures on the feed valve and on the highpressure valve tending to open said valves, the pressure tending to open the feed valve being opposed by the pressure in the outlet chamber and the pressure tending to open the high-pressure valve being opposed by the pressure in the inlet chamber, said pressure-imposing means opening the feed valve when the pressure in the outlet chamber is below the valve-opening pressure and opening the high-pressure valve when the pressure in the inlet chamber is below the valve-opening, pressure; and means whereby the valves may move to open and closed positions independently of each other and in response to variations of pressures in the said two chambers.

In testimony whereof I hereunto aflix my signature.

FRANCIS NESBITT POIGNAND.

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