US1737428A - Pressure valve - Google Patents

Description

Nov. 26, 1929; N. MERCUR 1,737,428

; PRESSURE VALVE Filed April 4, 1928 78 I I 9 4 f 4- WITNE5$E5 INVENTOR 1- We 5 P3 W 1. mm

' 35 \IM'QW Patented Nov. 26, 1329 UNIT'D ric NATHAN L. MERC'UB, OlE MCKEESPORT, PENNSYLVANIA, ASSIGINOR TO 0. HOWARD HOOK, OF PITTSBURGH, PENNSYLVANIA r @RESSURE VALVE Application fliefl'iapril 4,

This invention relates to pressure regulating valves and more especially to a combination pressure regulating and pressure relief valve.

It is common practice today to employ a reducing or regulating valve for controlling the flow of fluid under pressure from one system to another and a second valve for relieving the pressure in either of the systems in case it exceeds a predetermined limit.

It is the object of this invention generally stated to provide in a single unit for regulating the flow of fluid from one system to another and for relieving the pressure in the second system in case it exceeds a predetermined limit.

Another object of the invention is to provide means in a valve of the above described character for operating devices exterior to the valve itself.

Further objects of the invention will become apparent and a more complete understanding thereof will be had when the following description is read in conjunction with the accompanying drawing wherein the single figure illustrates a preferred embodiment of the invention.

In this form of the invention the valve comprises a main casing 1, having inlet and outlet ports as indicated by the arrows leading respectively into an inlet chamber 2 and out of an outlet chamber 3. The casing has a vertical bore 4 in which is seated a sleeve 5 which itself has a vertical bore '6 through which any fluid passing through the casing must go, and in order to facilitate the flow of fluid therethrough a fluting 8 is out around the outside of the sleeve 5 where the inlet chamber 2 connects with the vertical bore 4. The passage through the bore 6 is controlled by a vertically reciprocable valve 9, mounted upon a valve stem 11. The valve 9 has annular grooves 12 disposed near its two ends to provide fluid seal contact with the sleeve 5.

A diaphragm 13 extends across the top of the casing 1 and the end of the stem 11 1s fitted into a supporting member 14 mounted in the center of the diaphragm 13. A cap housing 15 is adapted to fit over the lower 1928. Serial No. 267,231.

casing 1 and may be clamped thereto in any suitable manner to maintain the diaphragm 13 in place. A coil spring 16 is disposed inslde of the cap 15 and adapted to bear upon the support member 14 to exert a pressure on the center of the diaphragm 13. A disk 17 is fitted inthe top of the cap 15, and adapted to engage the upper end of the spring 16. In order to adjust the pressurein the spring 16 a set screw 18 bearing'on the top of the disk 17 is disposed in thetop of the cap 15. Hence, the pressure that spring 16 exerts upon the diaphragm 13 can be regulated by movement of the adjusting screw 18.

An annular groove is provided in the valve stem support member 14 for receiving the inner end of a regulating or control lever 19 which is inserted through an opening 20 in the cap 15. An upwardly extending projection 21 is provided on the exterior of the casing 15 to form a fulcrum about which the lever 19 is pivoted.

In the base of the casing -1 is a. vertical bore 22 into which is fitted a sleeve 23 which itself has a verticalbore 24. At right angles to the bore 22 isan overflow or exhaust outlet 25 through which fluid released from the outlet chamber 3 may pass. Disposed inside of the bore 24 is a sleeve valve 26 which has an annular fluted portion 27 which cooperates with an annular-fluted portion 30 and openings in the sleeve 23. From the lower portion of the valve stem 11 there extends a threaded stem 31 which engages a cooperating threaded sleeve member 32 which has in its lower section a non-circular bore 33 adapted to be engaged by a non-circular adjusting member 34 which has an exterior noncircular portion 35. The sleeve member 32 is in turn disposed inside the sleeve valve 26 and a coil spring-36 is interposed between relief port The operation of the device is as follows:

The pressure in the main spring 16 is first adj usted. by the regulating screw 18 to exert the desired pressure upon the diaphragm 13, as for example sufficient to maintain the valve 9 open until 10 pounds of fluid pressure is present in the outlet chamber. Assuming that there is no pressure at all on the outlet side of the valve, the spring 16 will depress the diaphragm 13 and consequently the valve 9 so that a clear passage is made from the inlet chamber 2 of the main valve through the opening in the sleeve 5, and thence through the outlet chamber 3 to the outlet port. When suflicient fluid has passed into the system leading from the outlet chamber 3 to build up a pressure slightly in excess of 10 pounds, the diaphragm 13 will be forced upward against the spring 16 until the valve 9 shuts off the lateral ports in the sleeve 5. In other words, the valve will move to the closed position shown in thedrawing. The lever 19 actuated by this movement of the main valve may be employed to shut ofi'the gas of a heating system or operate any desired control device or regulator.

It is often desired. to maintain the pressure in the system leading from the outlet side of the valve within a predetermined limit, and in order to relieve the pressure in the outletsystem in case it. for any reason rises above. the predeterminedvalue, the valve mechanism in the base of the outlet chamber is provided. Assuming the main valve 9 to be closed as shown in the drawing, an assuming that the pressure on the outlet side or in the outlet chamber 3 is greater than that desired, for example greater than 10 pounds, the diaphragm 13 will be forced upward depending in' distance upon the pressure in the outlet chamber. When it has moved upwardly far enough valve sleeve 26- will raise the fluted lower portion 27- above the upper edge of the sleeve 23, whereupon fluid will pass downward around the fluted skirt of the sleeve valve 26 and out the escape port 25. This drainage will continue until the pressure in the outlet chamber is reduced sufficiently to allow the spring 16 to force the diaphragm 13 downward, far enough tomove the sleeve-valve 26 to the closed position as illustrated in the drawing.

In case it is desired to maintain the pressure in the outlet system at some otherlimit than 10 pounds, the adjusting member 34 may be actuated to move the sleeve member 32 up or down on the threaded portion 31 of the stem 11. When the sleeve valve 26 is lowered greater pressure will be required inside of the outlet chamber 3 to raise the sleeve valve sufficiently to allow the enclosed fluid to escape through the outlet port as it will be necessary to distort the diaphragm .13 to a greater extent 1 stem to which said to raise valve 26 to its pressure-releasing position. It will also be readily seen that by raising the sleeve valve 26 the release can be effected when a smaller pressure is present in the outlet chamber.

According to the provisions of the patent statutes, I have explained the principle and mode of operation of my invention and have illustrated what I now consider to be its preferred embodiment. However, I desire to have it understood that, within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

I elaim:

1. A fluid pressure regulator comprising a valve casing having an inlet and an outlet chamber, an opening connecting said chambers, a sleeve disposed in said opening, a reciprocable valve fitted into said sleeve, a relief opening in said outlet chamber, a sleeve disposed in said last named opening, a reciprocable valve fitted in-said last-named sleeve, a valve stem connectingsaid valves, a diaphragm connected to'and adapted to move said valve stem, said diaphragm being adapted to be moved by pressure in the outlet chamben' 2. A fluid pressure regulator comprising a valve casing having an inlet and an outlet chamber, an opening connecting said chambers, a reciprocable valve disposed in said opening, a relief opening in said outlet chamber, a sleeve valve disposed in said relief open- .ing, a single valve stem for moving both a thread cut on the lower end of said sleeve valve is connected, a .threaded member engaging said sleeve valve threaded onto said valve stem, a spring interposed between a shoulder on said valve stem and said sleeve valve for maintaining said sleeve valve in engagement with said valves,

threaded member, means disposed in the base of said casing for turning said threaded member to'adjust said sleeve valve.

3. A fluid pressure regulator comprising a valve casing having an inlet and an outlet chamber, an opening connecting said chambers,a sleeve disposed in said opening, a reciprocable valve fitted in said sleeve, a relief opening in said outlet chamber, a sleeve disposed in said relief opening, a sleeve valve 7 fitted in said sleeve, :1 single valve stem on which said first mentioned valve is mounted said stem having a thread cut on its lower end for attaching said sleeve valve thereto, a valve adjusting ,member engaging said sleeve valve provided with an inside thread for connecting said sleeve valve to said stem, an adjusting member fitted in the base ofvsaid relief openin sleeve for adjusting said sleeve valve, a diap ragxm disposed to be moved b the pressure in t e outlet chamber, to whic said valve stem is attached, a spring adapted to bear upon said diaphragm, a threaded screw engaging the top end of the spring for adjusting the pressure therein to predetermine the movement of the diaphragm in response to the pressure in the outlet chamber, and a lever Operably disposed to be actuated by said diaphragm.

In testimony whereof, I- sign my name.

NATHAN L. MERCUR.

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