US1696007A - Relief valve for deep-well pumps - Google Patents

Description

E Dec. 18,1928. I 1,696,007

c. B. LEWIS ET AL RELIEF VALVE FOR DEEP WELL PUMPS Filed Sept. 20, 1926 28 IIINVENTORS, C'harlesRLewis m EcggarnRobertson 2' ATTORNEY.

Patented Dec. 18, 1928.

. UNITED STA ES PATENT OFFICE.

CHARLES B. LEWIS AND EDGAR D. ROBERTSON, OF LOS ANGELES, CALIFORNIA.

RELIEF VALVE FOR DEEP-WELL PUMPS.

Application fil ed September 20, 1926. Serial No. 136,516.

; Our invention relates to valves for deep well pumps and more particularly to an improvedrelief valve foroil well pumps.

The main object of our invention is to provide an improved reliefvalve or check valve for use above the plunger in an oil Well pump, for the purpose of relieving the pressure on the plunger thereof during its downward stroke, and also for the purpose of preventing sediment, particularly sand, from settling and packing around the plunger valve.

A further, object is to provide a relief valve, foruse as'descr'ibed, having a freely floating flapper which makes contact with a double seatso as, to insure positive and complete closure of the valve openings and dependable action of the valve at all times. i

' A further object is to provide a valve, of the character described, which readily may be cleared'of sediment, after having been idle for a time, thus facilitating the resumption of pumping operations.

Other objects and'advantages will appear hereinafter and while We show herewith and will describe a preferred form of construction, we desire it to be understood that we'do not confine ourselves to such preferred form but that various changes andadaptations may be made therein without departing from the spirit of our invention as hereinafter claimed.

Referring to the drawings which 'accom-- pany this specification and form a part thereof lower part of an oil Well and of a. pump therein whichis equipped with our improved relief valve.

Fig. 2 is an enlarged sectional view of the relief valve shown in Fig. 1, taken on line 22 of that figure.

I Figs. 3, 1 and 5 are transverse sectional views of the relief valve taken on lines 3-3, 44; and 55, respectively, of Fig.2.

Considered more in detail the drawings show a well casing 10 within which is a pump having the usual standing valve 11, Garbutt attachment 12, plunger 13, working barrel 14, plunger valve 15, pol sh rod 16 and pump tubing 17. A coupling shoe 18, having a slightly tapered seat 19, connects two sections of the pump tubing above working barrel 14, said coupling shoe being especially adapted to receive and support our improved relief valve.

The valve consists of a. tubular standing or Fig. 1 is a vertical sectional view of the fixed part 20, adapted by its slightlytapered lower end to rest in seat 19 of shoe 18, a guide-sleeve 21, having'its lowerend screwed into the upper end of fixed part 20, a limiting nutor stop-nut 22 and a. lock-nut 23 screwed onto said guide-sleeve, in spaced relation to said fixed part 20, and a movable part or flap per 24' which encirclessaid guide-sleeve between said nut 22 and the upper end of fixed part 20. The bore of guide-slceve21 is of'a diameter slightly largerthan that of polish the inhuence of the varying pressures to which it is subjected.

The upper half, or thereabouts, of the fixed part of the valve has a threaded bore 26 adapted to receive the threaded lower end of guide--sleeve 21 and the lower half has an enlarged'borc 27 providing an annular space 28, around the polish rod, through which the upwardly flowing liquidniay pass. Vertical openings or ducts 29, communicating with annular space 28 are cut in the upper end of iii-Led part 20, leaving radial partitions or arms 30 and an inner sleeve 31 whichforin a connecting spider therein between guidesleeve 21 and the outer sleeve 32 thereof, as shown in Figs. 2 and 3, The upper ends of radial arms 30 are cut away, as shown in F ig. 2, so as to leave an annular channel in the upper end of fixed part 20, and the inner edges of the channel walls are slightly beveled, at 3%, thus forming two concentric annular seat faces on'whicli the flapper rests when the valve is closed.

The flapper 24 is made in the form of a short heavy sleeve or ring having an inner diameter Suiiiciently greater than the. outer diameter of guide-sleeve 21 to insure free 'movement of the former on the latter and to the inner side of the ring so as to equalize the pressure on all sides thereo'lf, especially when in contact with stop-nut 22.

The valve, thus made, and placed as shown in 1, serves as a check valve which permit-s an upward flow and prevents a downward low of liquid through the pump. During the upward stroke 01 the plunger 13 the upward pressure of the liqij'iid, as it flows through openings 29 of the .valve, overbalanc-es the downward pressure of the liquid in the upper part of the pump and lifts flapper 24 from its seat 34. As soon as the plunger has reached the limit of its upward stroke, flapper 2% falls bz-ick onto its seat where it rigidly held, during the downward stroke of the plunger, by the downward pressure of the liquid above.

It will be seen that the construction of our valve provides ample clearance for the flapper so that it has exceptional freedom of action. This particular arrangement of the flapper also enables the valve to clear itself of sediment, if nottoo considerable in amount, when operation of the pump resumed after a period of rest. This construction also permits the withdrawal of the plunger from the pump when such withdrawal becomes necessary, the valve being so scatedithat it will pull out with the plunger when the plunger valve comes in contact therewith.

Having thus illustrated and described our invention we claim:

A relief valve for deep-well pumps, com prising a lined tubular member having a seat in its upper end, a central guide extending above said iiXe'd member, said guide being adapted to receive the polish rod of a pump, and a vertically movable ring-flapper directed by said guide, said ring-flapper being adapted to seat on said seat,theupper) end of said ring-flapper being provided with radial grooves, and a nut to limit the upper movement o1 said ringflapper, said radial grooves equalizing the pressure on all sides of

Images