US1843953A - Reduction valve - Google Patents

Description

Feb. 9, 1932. H. E. M KINNEY 3,

REDUCTION VALVE Filed July 12, 1930 j Zf INVENTO 5 W i BY I A TTORNE Y.

'atented Feb. 9, 1932 i UNITED STATES PATENT OFFICE EAR-RY E. McKiNNEY, OF DETROIT, MICHIGAN nnnuc'rron VALVE Application filed. July 12,1980. Serial No. 467,442.

The-invention relates to valves, and particuas shown in Figure 2, the inner sides of arms ally to reduction valves, and has for its Obs. 6 being slightly ofi-set from the inner sides iect to provide a valve of this character conof the valve seats by a bevelled portion which structed to exhaust fluid therefrom at a con: forms an inclined seat for valves 7 and 51 stant predetermined pressure which will not mounted on the upper and lower valve seats, vary regardless of variations in the pressure respectively. The upper valve 7 has intesup lied to said valve. grally formed therewith and centrally de- A further object is to provide a valve of this pending therefrom an open ended cylindrical character having cooperating valve members guide member 8 into which a centrally veradapted to seat on spaced va ve seats and intically extending stem 9 carried by the terconnected in a manner to permit limited lower valve 51 is adapted to telescopically movement of one relative to the other to obfit. Longitudinal registering slots 10 are tain a control between the intake and outlet formed in opposite sides of the cylindrical of said valve responsive to slight variations guide member 8 and are adapted toreceivev in the pressure supplied to the valve and to therein a cross pin 11 carried by stem 9 eliminate special machining and fittingv of whereby stem 9 may have limited vertical said valves on said seats. movement relative to cylindrical guide 8.

A further object is to provide a valve of A spring 12 is coiled about guide 8 and stem this character in which pressure balancing 9 with its ends bearing on said u per and valve members and a diaphragm actuated lower valve members to normally old said member are mounted on the same shaft for valve members in extended or spaced relapositive inter-related movement whereby said tion. A stem 13 depends centrally from the valve members are instantly responsive to lower valve 51 and is received in an aperture variations in the exhaust pressure of said formed in a guide 14 carried by the lower valve. end of the valve casing 1, said stem being With the above and other objects in view, movable relative to said guide. A coil the invention resides in the combination and spring 15 encircles stem 13 and extends bearrangement of parts as hereinafter set forth, tween lower valve 51 and guide 14: and norshown in the drawings, described and claimed, mally projects the lower valve upwardly, said it being understood that changes in the prespring 15 preferably being of about onecise embodiment of the invention may be half the strength of s ring 12. From the made within the scope of what is claimed center of the upper si e of the valve 7 prowithout departing from the spirit of the injects a vertical stem 16 which is fixedly carvention. ried b a cylindrical depending member 17 In the drawings: carrie by a piston 18 mounted for recipro- Figure 1 is a vertical sectional view of the al vertical m ln n in a cylinder 1 rried valve. U by'the upper end of casing 1. Cylinder 19 Figure 2 isa fragmentary perspective view has a central opening 20 1n 1ts bottom to prm of one of the valve seats and valve members. Vide a passage for depending member 1 of Referring to the drawings, which illusthe piston; and piston 18, which is of a subtrate the preferred embodiment of'the instantially' greater area than valves 7 and 51,

vention, the numeral 1 designates a valve is provided with suitable piston rings 21 to casing having an intake'2 and an outlet 3. form an air-tight seal between said piston A cover plate 22 is mounted The valve intake 2 comprises a cylinder 4.- exand cylinder. tending into the casing and having its inner on the upper end of the casing 1 to form an end closed. At vertically aligned opposite air-tight closure for cylinder 19, said plate points of the cylinder land preferably in the having a port 23 therein communicating with center of casing 1 are mounted upper and a d cyhn erds 24: depend from cover lower valve seats 5 having spaced vertically plate 22;to' limit the upward movement of l projecting guide arms 6 at their upper sides, piston 18 in saidcylinder.

Centrall mounted on cover plate 22 is a control va ve casing 25 having chambers 26 and 27 formed therein which are separated by a vertical wall 28. Chamber 27 has communication with the cylinder 19 through a port 29 in casing 25 which registers with port 23 incover plate 22. Chambers 26 and 27 communicate with each other through anopening in wall 28 in which is mounted a valve seat 30 on which a valve 31 mounted on a horizontal rod 32 is adapted to seat. A valve 33 is mounted on rod 32 in spaced relation to valve 31 and is adapted to seat against and close an aperture 34 communicating with casing 1 by means of a conduit .35, said conduit connecting chamber 27 and casing 1. Rod 32 carrying the valves 31 and 33 disposed in chamber 27 extends horizontally throu h valve seat 30, chamber 26, and thence out of casing 25 through bearing 52, and a stg box 36 is carried by casin 25 to form an air-tight seal about rod 32 at aring 52. Chamber 26 has connection through a conduit 37 with the supply line connected to intake 2 of the valve, said conduit being tapped to said supply line (not shown) at a point preferably said valve.

Lugs 38 arecarried by casing 25, and said lugs carry rods 39 having outwardly direct- 10 or 15 feet in advance of ed off-set portions 40, said rods terminating in threaded portions 41 extending parallel to rod 32 in equally spaced relation thereto. A plate 42 is fixedly carried by the outer end of rods 39, and loosely mounted on the threaded portion 41 of said rods between plate 42 and casing 25 is a plate 43 whose position relative to plate 42 is regulated by adjusting nuts 44, plate 43 having a central aperture therein through which rod 32 extends. At the outer side of plate 42 is secured a registering dome member 45 which has connection through a conduit 46 with the low pressure or'outlet side of casing 1, and between dome member 45 and plate 42 is disposed a diaphragm 47. The outer face of plate 42 is recessed to receive flange 48 of a diaphragm actuated member 49 to which the outer end of rod 32issecured, and between member 49 and plate 43 is disposed a coil spring 50 which encircles rod 32? The operation of the valve is as follows:

Spring 50 is compressed to the desired strength byshifting plate 43 on threaded rods 41 by means of adjusting nuts 44, the setting of said spring being made the same as the desired outlet pressure of said valve. The fluid is then passed through said valve from intake 2 through one or both valves 7 and 51, into casing 1, and out through outlet 3. The exhaust pressure in casing 1 acts on diaphragm 47 through conduit 46, and if said pressure is the same as that forwhich the spring 50 is set, said diaphragm and spring will be balanced in substantially the position I illustrated, which will position rod 32 carrying valves 31 and 33 whereby said valves are both open, valve 33 being but slightly open and valve 31 being almost completely open. The open position of valve 31 sage of fluid from the supply line through conduit 37, chamber 26, valve seat 30, chamber 27, ports 29 and 23, into cylinder 19 where it acts upon piston 18. Piston 18, through its fixed connection with the upper valve 7 and the connection between the upper and lower valves 7 and 51, regulates the relative position of said valves in a manner to be more fully set forth. Thus when the position of valves 7 and 51 is such that the pressure passing through outlet 3 and conduit 46, is greater than that for which spring 50 is set, the pressure in dome 45 acting against diaphragm 47 Will shift member 49 and'rod 32 to the right against the action of spring 50 whereby valve 33 will be completely closed and valve 31 completely opened; the entire pressure of the supply line passing through conduit 37 will then pass through valve seat 30 into cylinder 19 and will depress piston 18 whereby valves 7 and 51 will be moved toward closed position by said piston to reduce the pressure of the fluid exhausted from the valve until said pressure is equal to the pressure for which spring 50 has been set. Should the pressure passing through outlet. 3 and conduit 46 be less than the pressure for which spring 50 is set, the spring 50 will shift member 49 and rod 32 to the left against the pressure in dome 45 to move valve 31 toward closed position and to open valve 33; this permits reduction of to balance spring 50. The studs 24 prevent cylinder 18 from contacting the cover plate under the influence of that the full surfaceof said piston may always he acted upon by the pressure of the fluid entering the cylinder through port 23. Thus the valve adjusts itself to variations in the supplied pressure, the change of position of valve members 7 and 51 as so controlled and actuated being substantially instantaneous upon variation of the pressure of the exhaust therefrom.

The operation of the valve members 7 and 51 is as follows: Release of pressure on piston 18 permits spring 12 to move the upper valve 7 upwardly toward open position against the pressure applied thereto by said piston. The lower valve 51 is held in closed position during the opening of valve 7 by spring 12, which is preferably of about twice the strength of spring 15, and the pin and permits passprings 12 and 15, so

;lot connection 10, 11 between the telescp-' tween casing 1 and chamber 26 and conduit ng members 8, 9 carried by said valves per- 37 extends between the supply line and apernits limited movement of the upper valve ture 34, the valve may be made spring clos- L'elative to the lower valve. Upon continued ing instead of spring opening which may upward movement of the upper valve 7 the be of advantage in connection with some of 70 cross pin 11 carried by the stem 9 of the the uses to which the valve may be put;

lower valve 51 engages the bottom of slot 10 The invention having been set forth, what to limit the relative movement of valves 7 isclaim-ed as new and useful is:

and 51 so that the spring 12 can no longer 1. Ina valve having an intake and outlet, hold the valve 51 closed; and from that point spaced valve seats each interposed between 75 the spring 15 will raise both valves against said intake and outlet, valve members cothe pressure applied to piston 18. The aboveoperating with said valve seats, a cylindridescribed, mode of operation is reversed when cal member carried by one valve member and pressure on the piston 18 is increased; that is, extending in the direction of the other valve the piston depresses both valves against the member, a stem carried by the second valve action of springs 12 and 15, valve'iil being member and adapted to be slidably're'ceived first closed against'the action of spring 15 in said cylindrical member, a cross pin carand valve 7 then being closed against the rier by said stem, said cylindrical member action of spring 12. This valve arrangement having a longitudinal slot formed therein to permits of a sensitive valve control responsive receive said cross pin, a coil spring encircling to slight variations of pressure on piston 18, said cylindrical member and stem and bearand it will be obvious that if spring 15 is of ing against said valve members, and a spring but one-half the strength of spring 12, both of less strength than said first named spring valve members 7 and 51 will be raised thereby bearing upon said second valve member and only one-half as fast against the pressure adapted to open said second valve after said applied to the piston as When valve member first valve has been opened by said first 7 alone is actuated by spring 12. The pin named spring.

and slot connection between the stems of valve 2. In a valve having an intake and outlet, members 7 and 51 is such that pin 11 will not spaced valve seats each interposed between normally contact the top of slot 10 when said Said int and Outlet, Valve members ppvalves are both closed, whereby said valves crating with said valve seats, cooperating may both be operatively seated on their valve members carried by said valve members, a seats without close machining and special fitpin and slot connect-ion between said coop,- ting of each individual valve member to its erating members, a sprmg bearing agamst seat, thereby permitting replacement of this said valve members to unseat one of said valve assembly vwith a standard assembly valve members, and a spring of less strength which is not possible where such spaced cothan said first spring bearing against an operating valves are fixedly connected. adapted to unseat the other valve member lVith a valve of the construction described, after the first spring has unseated the first many advantages over conventional valves valve member.

of this type are obtained. Thus the direct 3. In a valve having an intake andoutlet, connection of the pressure balancing valves spaced valve seats each lnterposed between 31 and 33 with the diaphragm actuated memsaid intake and outlet, valve members coopber 49 makes said valves instantaneously recrating with said valve seats, means permitsponsive to changes in the pressure exhausted ting limited relative movement of said valve 9 from the valve members 7 and 51 whereby members, a spring bearing against said valve valves 31 and 33 may immediately shift t members tending to unseat one of said valve alter the amount of Pressure PP Q to P members, and a spring adapted to unseat the ton 18 so that Valveh hand-51 y lmmedl other valve member upon completion oi the s ately Change thell' Posltlon to lessen relative movement of said valve members.

crease the Pressure ,P therethl'ough- 4. In a valve having an intake and outlet,

The Valves 7 and m .combmatloh Wlth pressure influenced means, a valve carried I the Springs 12 and 15; are Sensltive and highly by said pressure influenced means, a second responslve to changes m the pressure apphed valve spaced from said first valve, said valves I. to Plston and Wlth the particular coneach being inserted between said intake and in the supply line to pass therethrough, as

struction of valve seats 6 are ca able of sli ht adjustment to accommodate sni aIl variati ns t t means .connectmg Sald Valves to pertmt in pressuref the valves 7 and 51 when both, lnmtefl t 'i movement thereof Sprmg fully opened permitting the entire pressure engagmg Sald Yalves i adapted to unseat said first valve in opposition to said pressure where the supplied pressure is only equal to influenced means, and a Second p g of less or is less than the desired exhaust pressure. strength t S first p ing dapted to By reversal of the valve seats 6 and valves un eat said second va ve 1n opposltion to 7 and 51, together with. reversal of conduits said pressure influenced means upon comple- 35 and 37 whereby conduit 35 extends betion of the"'movement of the first valve rela:

tive to the-second valve, said valves communicating with said intake and outlet,

5. In a valve having an intake and outlet, spaced valve members each interposed between said intake and outlet, pressure influenced means, means governed by the pressure in said outlet and controlling the pressure applied to said pressure influenced means, means connecting said valve members to permit limited relative movement thereof, a spring bearing against said valve members adapted to unseat one of said valve members against the action of the pressure influenced means, and a second s ring of less strength than said first sprin a apted to unseat the second valve mem er against the action of the pressure influenced means u on completion of the movement of said rst valve member relative to the second valve member.

6. In a valve having an intake and outlet, spaced valve members each interposed between said intalre and outlet, pressure influenced means, means governed by the pressure in said outlet and controlling the pressure applied to saidpressure influenced means, means connecting said valve members to permit limited relative movement thereof, means for unseating one of said valve members against the action of said pressure influenced means, and means for unseating the second valve member against the action of said pressure influenced means upon completion 0 member.

ln'testimony whereof I afix my signature.

HARRY E. MCKINNEY.

aeaaeee the movement of the first valve member relative to the second valve

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