US2599979A

US2599979A - Pressure and vacuum relief valve

Info

Publication number: US2599979A
Application number: US173915A
Authority: US
Inventors: Phillips B Drane
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-07-14
Filing date: 1950-07-14
Publication date: 1952-06-10
Anticipated expiration: 1969-06-10

Description

June 10, 1952 P. BQDRANE 2,599,979

PRESSURE AND VACUUM RELIEF'VALVE Filed Jfily 14, 1950 2 Sl-iEETS-SHEET l Bummer EB zya 77d Gttorneg June 10, 1952 P. B. DRANE 9 PRESSURE AND VACUUM RELIEF VALVE Filed July 14, 1950 ZSHEETS-SHEET 2 I /4 7 I m M 6 ,27 k 2/ 7 a 2d" 30 \I" 2 3X 3/ J- 1 In 9 Inventor Phallpps B. flr'ap 21/ e 75 Gnome Patented June 10, 1 952 UNITED STATES PATENT OFFICE PRESSURE AND VACUUM RELIEF VALVE Phillips B. Drane, Tulsa, Okla.

Application July 14, 1950, Serial No. 173,915

3 Claims. (Cl. 137-53) The invention relates to in line pressure and vacuum relief valves, and has for its object to provide a device of this kind of a diaphragm type and provided with means whereb gas, passing through the valve, at a predetermined pressure, will overcome the expansive action of a regulating spring and raise a valve off of its seat, thereby allowing the gas, under its normal pressure, to pass through the valve. Also to provide means whereby the valve will be closed by the expansion spring when the gas pressure on the intake side drops below a predetermined pressure and remain closed until the gas pressure again builds up to the predetermined set pressure of the device for raising the valve from its seat.

A further object is to provide limited axial movement of the valve through the diaphragm and independent of the diaphragm so the valve will unseat and allow back flow of gas from the discharge side to the intake side in case of the building up of a vacuum on the intake side.

A further object is to provide the disc valve with a sleeve extending upwardly and slidably mounted in a bearing on the axis of the diaphragm and the sleeve with limiting means for limitin the downward movement of the valve and also allowing the diaphragm to lift the valve from its seat when the desired pressure is built up on the intake side.

A further object is to provide the upper side of the diaphragm with a guide sleeve having its upper end slidably mounted in a bearing of the valve body cover, and a flanged plug in the upper end of said diaphragm sleeve cooperating with the upper side of the cover for limiting the downward movement of the diaphragm and sleeve and also forming a seat for the lower end of the expansion spring.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a vertical longitudinal sectional view through the valve showing the valve closed.

Figure 2 is a view similar to Figure 1 but showing the diaphragm controlled valve unseated for allowing the passage of gas after it has reached a predetermined pressure.

Figure 3 is a view similar to Figure 1 but showing the valve unseated for allowing back flow of gas through the valve to the intake side to overcome a vacuum which may be created on the intake side.

Referring to the drawings, the numeral I designates the body of the relief valve, which body has a chamber extending therethrough, 2 the intake side of the body and 3 the discharge.

The intake side 2 and the discharge side 3 are in communication with each other through the central opening 4 surrounded by a valve seat 5. Secured to the upper side of the body I by means of bolts 6 is a cover 1, and clamped between the flange 8 of the cover and the upper sideof the body I is a diaphragm 9.

Bolted by means of bolts 10 to the upper side of the cover I is a vertically elongated hood ll having an expansion spring I2 therein. Expansion spring I2 is interposed between a disc l3 in the upper end of the hood H, and the upper side of the threaded plug I4. Plug M is provided with an annular flange l5, which flange engages the bottom of the chamber l6 and limits the downward movement of the plug l 4. The desired pressure operation is obtained by varying the expansive power of the spring l2, and is accomplished by means of the adjusting screw 17 threaded through the upper end of the hood I l and engaging the upper side of the disc I3, hence it will be seen that the expansive force of the spring I2 can be varied, and the bolt ll locked against rotation by means of the lock nut l8. Flanged plug 14 transmits expansive pressure of the spring to the center of the diaphragm 9 through the medium of a diaphragm sleeve [9, which sleeve is slidably mounted for an upward and downward movement in a bearing 20 in the upper side of the cover 1.

The lower end of the diaphragm sleeve 19 is provided with an annular flange 2 I, which flange engages the upper side of the diaphragm and this flange is anchored to the diaphragm by means of screws 22, which pass downwardly through the diaphragm and thence into the plate 23 engaging the under side of the diaphragm.

Plate 23 is provided with a central bearing 24, through which bearing is slidably mounted the disc valve sleeve 25. Secured on the upper end of the valve sleeve 25 is a limiting washer 26, which washer engages the upper side of the diaphragm and limits the downward movement of the sleeve,. however it allows free upward movement of the valve sleeve 25. Limit washer 26 is held in position by means of a bolt 21 passing therethrough and threaded into the upper end of the sleeve 25.

The lower end of the valve sleeve 25 terminates in a horizontal disc 28 within the opening 4, as shown in Figure l, and clamped between the disc 28 and the upper disc 29 by means of screws 30 is a diaphragm 3 l, the marginal edges of which flex upwardly into the annular channel 32 around the disc 29 to insure a positive seating against gas pressure when the valve is closed. The disc valve is guided by a downwardly extending guide stem 33 slidably'mounted in the aperture 34 of a guide lug 35, therefore it will be seen that the valve will be axially guided in its upward and downward movement.

The operation is as follows. Assuming that the expansion spring 12 has been adjusted for the proper pressure operation, gas enters the intake 2 and acts on the under side of the diaphragm 9. When the set pressure is built up the diaphragm 9 is forced upwardly against the action of the spring 12, and the diaphragm will thenlift the valve from its seat 5, allowing the flow of gas under. proper pressure to the discharge side 3. This open position is shown in Figure 2. It will be noted-that the area of the valve is smaller than the diaphragm, hence the diaphragm will positively raise the valve from its seat. Upon the falling of the pressure on the intake side the expansion spring will move the diaphragm 9 downwardly, however the pressure will still act on theupper side of the valve and insure it seating until the pressure again builds up on the intake side. 1

Referring to Figure 3, the parts are shown in the position where a vacuum has built up on the intake side,- and this vacuum, along with the spring, immediately forcesthe diaphragm 9 downwardly until itis limited by the flange of the flanged plugl4, and then the vacuum acts on the upper side of thediscvalve and pulls the valve upwardly to unseated position and causes the valve sleeve 25 to slide upwardly through the diaphragm 9 while the diaphragm 9 remains stationary.

From the above it will be seen that a pressure and vacuum relief valve is provided which is particularly adaptedfor in line use, and that pressure and vacuum will be immediately taken care of under all workingconditions.

The invention having been set forth what is claimed. as new and useful is:

l. A pressure and vacuum relief valve comprising .a body memberhaving an intake and discharge passage. therethrough, a valve seatbetween said intake and discharge passage and surrounding an opening of communication between said intake and discharge, a hood carried by the upper side of the body, said hood being attached to the upper side of the body by a cover forming the diaphragm chamber, a diaphragm clamped between said cover and body, a guide sleeve carried by the upper side of the diaphragm and slidably mounted through the upper side of the cover and extending into the hood, an expansion spring disposed within the hood and exerting a downward pressure on the diaphragm guide sleeve, a disc valve below the diaphragm and cooperating with the valve seat, an upwardly extending guide sleeve carried by the valve and extending through the diaphragm into the diaphragm sleeve, means carried by the valve sleeve and limiting downward movement of the valve sleeve in relation to the diaphragm sleeve, a guide stem carried by said valve and extending downwardly through guide means and a flangedplug anchored to the upper end of the diaphragm sleeve and-cooperating with the upper side of the cover for limiting downward movement of the diaphragm and diaphragm sleeve.

tending downwardly through the hood and engaging the disc.

3. A device as, set forth in claim 1 wherein the valvecomprises a disc carried by the lower end of the valve sleeve, a gasket carried by the upper "side of the disc and. a clamping disc engaging the upper side of the, gasket, said clamping disc being of greaterv diameter than the first mentioned .disc-so-that. thegasket will register with valve seat, said gasket being of the same diameter as the clampingdisc, the under side of said clamping dischaving an annular channel into which the gasket is flexed.

PHILLIPS B. DRANE.

REFERENGES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,317,923 I Lebo Apr. 27,1943 2,367,260 Beddoes Jan. 16, 1945