US1765427A - Pumping apparatus - Google Patents

Description

4 sheets-sheet 1 June 24, 1930.-

l. B. HUMPREYS PUMPING APPARATUS Filed Aug. 19, 1924 l. B. HUMPREYS PUMPING APPARATUS June 24, 1930.

Filed Aug. "19, 1924 4 Sheets-Sheet ghmntoz June 24, 1930. 1. B. HUMPREYS 1,765,427

PUMPING APPARATUS l 1i E sued Aug. 19, 1924 4 sheds-sheet 3 June 24, 1930x B, HUMPREYS I 1,765,427

PUMPING APPARATUS Patented June 24, 1930 UNITED STATES IRA B. BUMPER-EYB, OF DENVER, COORADO Immo lArranyrrns applicati@ mea .iugm 1a, 1924. serial m. 732,988.

This invention relates to improvements in pumping apparatus, and more particularly 4 to an apparatus for pumping wells in which a column of lcomparatively non-compressible 5 :Huid is substituted for the rigid sucker-rod construction now common in the art, and which column of fluid under pressure operates as the motive power to elevate a liquid to the point desired.

This invention is an improvement on that fluid actuated pump for which I made an application for Letters Patent on February 24, 1923, Serial No. 620,913. Like that particular pump, the present pump is doubleacting. yAmong the lparticular advantages of my present pumping apparatus are simplicity in construction and operation and ease of installation and removal for repair.

' It has been found that the use of suckerrod pumps is very unsatisfactory in'deep wells. Particularly is this the case in the fields in Southern California and Texas, where many of the wells are of a depth of over four thousand feet.

Among the diiiculties encountered with the use of the sucker-rod pump in deep wells, are that the rods very quickly wear 1n two, particularly at the joints of the rod section; and likewise wear holes in the well tubing, and in many cases where it is believed there is considerable( oil that might be recovered from the well, these pumps have produced about a pint of oil per stroke, and the number of strokes being limited by the peculiar construction of the walking beam, it will be obvious that very little oil isA produced with such a device.

The principal object of this invention is to produce a iuid operated pumping apparatus to elevate fluid from a source of supply that is simple in construction, with few parts, and which may easily be removed 'from the Well should trouble develop thereon.

Another important object of this invention, like that of` that particular application heretofore referred to, is to produce a pump in which any leak in the pump or in the valves connected therewith will result in the fluid which is actuating the pump passing out the discharge pipe from the pump and not passing into the oil sands.

An object of this invention is to provide a double-acting hydraulic pump for elevating fluids having a single valve of'such a con- 56 struction as to do the work of both the central valve and the working valve employed in that pumping mechanism of my copending application.

A further object of this invention is to pro- 00 vide a valve mechanism operable by differential pressure that it is impossible to stop in a dead-center position.

Another object of this invention is to provide a pump for elevating liquids which is of 05 relatively small diametrical dimensions so that it will be adapted -to be disposed in an oil well or oil well casing of small diameter, and which pump is adapted Ato be actuated from a remote point by fluid under pressure.

Another object of this invention may be to provide a pump of comparatively high efficiency.

Other objects and advantages of this invention will be apparent from the following detailed description of a preferred embodiment thereof, as illustrated in the accompanying drawings. l

In the drawings: A

Fig. 1 is a diagrammatic side elevation of 30 an oil well illustrating the manner of pressure mechanism connected with-a fluid operated pump, embodying this invention.

' Fig. 2 is a side view, partly in section, of a double-acting fluid actuatedr well pump embodying-this invention. f

Fig. 3 is a vertical mid-section of the s upper portion of the pump illustrated in Fig.

2, illustrating a manner of valve construetion therefor.

Fig. 4 is a vertical mid-section of the lower portion of the double-acting hydraulic pump illustrated in Fig. 2.

Fig. 5 is a horizontal section taken on the line 5-5 of Fig. 3. y

Fig. 6 is a horizontal section taken on the line 6-6 of Fig. 3.

Fig. 7 is a horizontal section taken on the line 7 7 of Fig. 4.

Fig. 8 is a central mid-section of the lo double-acting hydraulic pump illustrated in Fig. 2, showing the valve in the central position as moved thereto by the reclprocation of the pistons shown in the upper position.

Fig. 9 is a view similar to Fig. 8, illustrating the valve in the upper position and the pistons in the central position near the end of their downward stroke. y

Fig. 1() is a central, mid-section of the upper end of the hydraulic pump illustrated in Fig. 2, illustrating a modified' form of connection of the pressure inlet and discharge pipes therewith.

Fig. 11 is a horizontal section taken on the line 11-11 of Fig. 10.

Fig. 12 is a horizontal section taken on thel line 1212 of Fig. 10.

' Fig. 13 is a verticalsection of a vhydraulic oil well pump embodying a modified form of valve construction.

Fig. 14 is an enlarged vertical mid-section of the valve construction illustrated in Fig. 13.

Fig. 15 is a horizontal section taken on the line 15-15 of Fig. 14.

Referring to the preferred embodiment of this invention illustrated in the drawings, similar parts are illustrated by like numerals.

A represents a fluid storage tank; B represents a pressure mechanism for imparting pressure to the fluid pumped from the-reservoir A; C represents a well casing; D represents a discharge pipe or casing for the pumping mechanism; E represents a high-pressure inlet pipe; F represents a unit-ary working control valve; G represents the valve housing or casing in vwhich the valve F is actuated; H designates a hollow plunger rod which carries the pump pistons .l and K within the pump cylinder or chamber L.

Attention is called to the fact that the pump mechanism illustrated in Figs. 3 and V4, put together, form a complete pump which is of comparatively short length, approximately 8 feet. It will be apparent from the drawings that the complete pumping mechanism may be assembled above the well in the cylinder L; attached to the valve housing G and lowered into the well within the discharge pipe D, which pipe D may have previously been lowered into the well in any desired manner, until the collar or ring 1 engages the inwardly extending flange 2 of the coupling 3. It will then be apparent that the pumping mechanism, with its attending pipes, is partially supported by the iiange 2 and that in order to raise the pumping mechanism from the well it is only necessary to pull the inner pressure pipe E. The collar 1, is secured into the lower end of the nipple 1() by means of the threaded collar 101.

The valve casing G is screw-threaded to the lower end of the pressure pipe E as at 4, the said valve casing G being closed at its upper end by means of a cap 5. Ports 6 are G as at 9. The pipe or nipple 10 is screwthreaded tothe valve casing as at 11 and is for the purpose of directioning the fluid under pressureto actuate the pump on its upper stroke. The piston K is mounted on the lower end of the hollow lunger rod H and carries at its lower end a all `valve 12, which ball valve 12 is maintained in the valve housing 13 by means of a valve shoe 14 of the Vordinary construction. Packing 15 may be provided for the housing 13 so as to maintain a leak-proof connection wit-h the pump cylinder L. Secured in position at the lower end of the pump cylinder L is a standing valve 16 of the .ordinary construction.

Packing is positioned between the hollow plunger rod H and the cylinder L, preferably above the collar 1, which packing is positioned thereon by the following means. A packing ring 17 is secured to the cylinder L by meansv of a plurality of bolts or set screws 18 and packing 19 is positioned on the ring 17 and is held thereon by means of the packing ring 2O which is yieldingly forced downward by means of a helical spring 21, which helical spring 21 engages the ring 20 at one end and a ring 22, which ring 22 is secured to the cylinder L by means of a plurality of set screws 23. The advantage of having the packing 19 held in position in the manner heretofore described is that any wear thereof will be compensated for by the spring 21.

Packing is positioned between the cylinder L and the pipe 10 to provide a leak-proof joint at the lower end of the pipe 10 and is maintained in position by means of the packing ring 24 which rests on or is an extension of the collar 1.4 Packing 25 of any suitable material is positioned on the ring 24 and is held in position at its upper end by means of a packing ring 26 which packing rings and packing are of the proper size t0 be maintained in position by the heads of the set screws 23 heretofore described.

The pistons` J and K are of any suitable construction and may be maintained in al tight relation with the cylinder L by means of piston rings, or packing 15 may be used in place of the piston rings, if such is desired.

Screw-threaded in the interior of the plunger rod Hradjacent the upper piston J is a plug 28, and screw-threaded to the exterior of the rod H is a member 29, which Cil member 29 is cylindrical in form and bent inward at its upper end to -form the circumferential shoul er 30. A spacin rin 31 is held in osition on the top of t e p ugged hollow p unger rod by any suitable means. A ring 32 rests on the 'spacingring 31 and 1s adapted to engage onevend of a helical sprmg 33, which helical spring is engaged at lts other end by means of a rin 34, which rmg 34 abuts the inwardly exten g shoulder 30.

Passing through the rings 32 and 34 is a valve actuating rod 35 which rod 35 has a head 36 at its lower end and a head'37 at its upper end. The heads 36 and 37 may be nuts screwthreaded thereto. The rod 35 extends up-` 10 of the piston type, having piston rings 42 for packing mounted thereon to maintain a3 ,leak-proof joint with the valve housing G.

One 'of the valve heads 40, is larger in` cross sectional area than the other for the purpose that will hereafter be described.

The valve housing G is of smaller internal diameter at its upper end so as to provide a tight lit with the piston 41, which is of smaller external diameter than the piston 40. The piston 41 of the valve F is of approximately the same width as the port 8, while the piston is likewise 'of approximately the same vlid'th as the horizontal extensions 43 of the port 6. The piston 40 is bevelled at its lower end 44 to closely fit the bevelled valve seat 45.

In the position of the valve illustrated inv through the channel 46 into the nipple 10 then through ports 46a into cylinder L and exerts a pressure against the under side of the piston J elevating the same. The piston is then raised to the position illustrated in Fig. 8, at which time the extension 39' of the valve stem 38 engages the ring 34 and the said valve is caused to move upward to the position illustrated in Fig. 8', which is the top of the stroke of the pistons J und K. The valve is carried above the dead center position illustrated in Fig. 8 ofthe drawings, by inertia and thence on upward to the position illustrated in Fig. 9 by reason of the high pressure fluid acting on the lower face of the piston 40. With the valve in the position illustrated in Fig. 9 the fluid under pressure passes through the port 6, acts against the upper face of the piston J and forces the same downwardly until the head 37 of the rod 35 engages the inward extension 39 of the valve stem 38, and on continued downward motion, the valve F is a ain returned to that osition illustrated in g. 8 and downwar ly past dead center by inertia. The moment the valve is below dead center position it is carried on downwardly, to the position illustrated in Fig..3, by the high pressure fiuid acting on the upper face of piston 40. At this time the high pressure fluid is also acting on the lower face of the piston 41 but due to the larger diameter of the piston 40, the valve is earned downwardly.

During the downward motion of the pistons J and K, the fluid sucked into the pump barrel or cylinder L on the upward stroke is exhausted through the hollow plunger rod ports 47 and the ports 46 and passes upward through the port 7, and, as the valve is in the position illustrated in Fig. 9 during the downward stroke, the pumped fluid passes through the valve out through the port 8 and is discharged through the discharge pipe D. During the upward stroke of the pump, with the valve in the position'illustrated in Fig. 3, the oil above the piston J passes through the ports 48 into the hollow valve stem 38 and hence out through the port 8 into the discharge ipe D. The upward stroke of the piston is the suction stroke, and the standing valve is open so that oil is sucked fromthe well into the pump barrel or cylinder L. Pressure being exerted on the ball valve 12, the same will be closed during the upward stroke. During the downward stroke the ball in the valve 12 is unseated and the oil below the piston K is displaced into the hollow plunger rod H, forcing the oil therein out through the ports 47,

46a and 46 through the valve F and is dis-` charged from the well through pipe D.

The modification of this pump illustrated in Figs. 10, 11 and`12 is entirely similar to that modification described exce t for the connection of the pump with the plpes D and E. This modification of the pump will fit into a smaller casing than that modification heretofore described, but has the disadvantage of not being adapted to be pulled'from the well on the pulling of a single strand of tubing. The inside of the pressure pipe E is screw-threaded to the valve housing G as illustrated at 49, and the discharge pi e D is screw-threaded to the valve housing as at 50, the valve housing G being of slightly different structure than the valve housing G to eliminate direct communication of the pressure pipe E with the discharge pipe D, there being provided the horizontal extension 51, which is not found in the valve housing G; and the ports 8 are communicated with the discharge pipe D by means of the vertical passges 8 cored or drilled in the valve housing The modification of this pump illustrated in Figs. 13, 14 and 15 is entirely similar to that construction illustrated in-Figs. 1 t o 9 inclusive, exce t for vthe valve mechanism embodied therein, which v alve mechanism 1s of the following construction:

The valve casing G* is bored larger thanv f to. Recesses 59* are provided in the pistons 55* and 56 to enable a free grinding of the said ring heads. The rings 57* and 58a may be bevelled as shown, or they may be formed spherical in shape, or they mlght be formed of square cross section; however, applicant believes that the bevelled or conical construction of these valve rings 57a and 58a to be the most practical and provides a better fittin connection with the valve seats; and wit the said conical shape it is easier to grind than if the same were spherical or square.

The operation of this modified form p of valve F* is similar to that described in conoperated through the portion'of its travel by means of motion transmitted thereto by,

the rod 35* and is carried past the dead center by the difference in pressure exerted against the area of the fixed seat 54al minus the area of the sliding seat 52* or 53, depending upon which seat 52* or 53* the valve head 55a is seated with.

Having fully described my invention it is to be understood that I do not wish. to be limited to this preferred embodiment thereof which may obviously be varied in detail without departing from the spirit of the appended claims.

What I claim is:

1. A fluid pressure actuated well pump including an inner pipe and an outer pipe, a pumping mechanism suspended from the end of the innerpipe and embraced within the outer pipe, said pumping mechanism provided with a unitary control and working valve, a pressure mechanism communicating with one of said pipes above said pumping mechanism and providing liquid under pressure for actuating'the pumplng mechanism, and said valve controlling and directing the inlet of fluid pressure to the pumping mechanism and the discharge of the pumped fluid 'from the pumping mechanism, whereby said valve controls the operation of the pumping mechanism.

E?. A fluid pressure actuated well pump including an inner pipe and an outer pipe, a

pumping mechanism suspended from the end of the inner pipe and embraced within the Amfom-tar outer pipe, means for loosely supporting the pumping mechanism within the outer pipe, a pressure mechanism communicating with one of said pipes above said pumping mechanism and providing Huid under pressure for actuating the pumping mechanism, a unitary control and working valve formin a. part of said pumpingmechanism; and sai valve positioned to control the inlettof the fluid pressure for actuating the pumping vmechanism and the discharge of the pumped fluid from the pumping mechanism.

3. A fluid pressure actuated well pump comprising a pressure conveying pipe and a fluid discharge pipe, a fluid pressure supplying mechanism communicating with lsaid pressure conveying pipe, a .unitar working and control valve, a vertical pump arrel suspended from said unitary valve, an upper piston and a lower piston embraced within the said barrel, a hollow plunger rod connecting said pistons and acting on the upward stroke of said pump pistons as a conduit for the liquid pumped from the well, said pump barrel having communication with said pressure pipe and said discharge pipe, and said unitary valve controlling and directing the admission of the fluid pressure to the pumping mechanism and the discharge of the fluid pumped from the well.

4. A fluid pressure actuated well pump comprising a pressure conveying pipe embraced within a fluid discharge pipe, a pumping mechanism suspended from and in communication with both of said pipes, said pumping mechanism including a vertical pump barrel having therein upper and lower pistons connected by a hollow plunger, said plunger having communication with the pump barrel and serving on the upward stroke of said pump pistons as an outlet conduit for the pumped'liquid from the well, a fluid pressure supplying mechanism communicating with the pressure conveying pipe, and means for alternately directing thefluid pressure against the upper and lower sides of one of the pistons for reciprocating the same and causing them to force liquid from the well up the discharge pipe.

5. A fluid pressure actuated well pump comprising a pressure conveying pipe'embraced within a fluid discharge pipe, a pumping mechanism suspended vfrom and in communication with both of said pipes, said pumping mechanism including a vertical pump barrel having therein upper and lower pistons connected by a hollow plunger, said plunger having communication with the pump barrel and serving on the upward stroke of said pump pistons as an outlet conduit for the pumped liquid from the well, a fluid pressure supplying mechanism communicating with the pressure conveying pipe, and a unitary valve for alternately directing the fluid pressure against the upper and lower sides of one of said pistons andfor controlling the path of flow of the pumped fluid from the well, whereby said inner valve controls the operation of the pumping mechanism.

6. A fluid pressure actuated well pump con'uprisingl an inner pipe and an outer pipe,

a pumping mechanism suspended-from onel of said pipes and in communication with both of them, a pressure supplying mechanism communicating with and supplying fluid under pressure to one of said pi es above said pumping mechanism for actuating the pumping mechanism, said pumpin .mechanism 1ncluding a sliding unitary wor ing and control valve for controlling the discharge of pumped liquid from the pumping mechanism and the admission of fluid pressure to the pumping mechanism, a pump cylinder, a pair of pistons within said cylinder, said pistons actuated by said pressure fluid for the purpose of pumping and discharging liquid from the well, and means connecting said piston with said unitary valve for operating the same.

7 A fluid pressure actuated well pump comprising an inner pipe, and an outer pipe, a pumping mechanism suspended f rom one of said pipes andl in communication with yboth of them, a pressure supplying mecha-- nism \\ommunicating with and supplying 'fluid' under pressure yto one of said pipes above said pumping mechanism for actuating the lpumping mechanism, said pumping mechanism including a sliding unitary working and control valve for controlling the discharge of pumped liquid from the pumping mechanism and the admission of fluid pressure to the pumping mechanism, a pump cylinder, a pair of pistons within said cylinder, said pistons actuated by said pressure fluid for the purpose of pumping and discharging liquid from the well, and a lost motion connection between the pistons and said unitaryl valve for moving the valve throughout a portion of its travel.

8. A fluid pressure actuated well pump comprising an inner pipe and an outer pipe, a pumping mechanism suspended from one of said pipes and in communication with both of them, a fluid pressure supplying mechanism communicating with one of the p pipes at a point above the pumping mechamsm and supplying'iiuid pressure for actuating the pumping mechanism, said pumping mechanism provided with upper and lower pistons in separated relation and connected by a hollow plunger rod, said plunger rod acting as a conduit for the outlet passage of liquid pumped from the well on the upward stroke of the pistons, and means within the pipes and forming'apart of the pumping mechanism to alternate y direct the pressure against the upper and lower'sides of one of said pistons to cause a reciprocation thereof for forcing liquid upwardly and outwardly from the well from one of said pipes.

9. A uid pressure actuated well pump including elongated concentrically arrangedy of said pipes and in communication with both of them, a liuid pressure supplying mechanism communicating with one ofosaid pipes at a point above the pumping mechanism and providing Huid under pressure for actuating the pumping mechanism, said pumping mechanism having a vertical pump cylinder with a pair of pistons mounted for reciprocation therein, and a unitary working and control valve forming a part of said pumping mechanism and alternately directing the fluid pressure above and below one of said pistons and simultaneously directing the path of low of the pumped iiuid from the well upwardly through one of said concentrically arranged pipes. l

10. A fluid pressure actuated well pump comprising an inner pipe and an outer pipe, y

a pumping mechanism suspended from the inner pipe, la Huid pressure supplying mechanism communicating with one of said pipes at a point above said pumping mechanism and supplying fluid under pressure for actuating the pumping mechanism, and a unitary valve mechanism within said pumping mechanism for continuously directing the iluid pumped by the umping mechanism upwardly and outwar y through ont of said pipes and simultaneously directin the fluid' supplying mechanism in communication with the innen pipe at a point above said pumpmechanism sus Apended from the inner pipe, a fluid pressure ing mechanism for delivering Huid under y pressure to the pumping mechanism, said pumping mechanism including a unitary working and control valve placed to control the admission of the pressure luidto the pumping mechanism and the discharge of Huid pumped by said pumping mechanism pipe.

12. A deep well pump of the character herein described, including apum barrel having therein a piston, inlet an pipes communicating withl said pumpbarrel, a liquid pressure supplying mechanism communicating with the inlet pipe for actuating said piston, a fluid inlet and a fluid outlet,`

upwardly and outwardly through the outer outlet herein described, including a pump barrel having therein a piston, inlet and outlet pipes communicating with said pump barrel, a

' liquid pressure supplying mechanism communicating with the inlet pipe and supplying liquid pressure to the said pump barrel for actuating said piston, a fluid inlet and a fluid outlet, a valve controlling said Huid inlet and outlet for controlling the operation of the pump, said valve comprising a hollow valve stem having at its ends valve heads of differential diameters, said hollow stem in communication with the pump cylinder and adapted to act as anoutlet therefor during the upward stroke of the piston, and a stationary valve seat for one of the valve heads and a movable valve seat for the other valve head, whereby said valve seats compensate for Wear.

14. A deep well pum of the character herein'described, inclu ing a pump barrel having therein a piston, inlet and outlet pipes communicating with said pump barrel, a liquid pressure supplying mechanism comv.municating with the inlet pipe and supplying liquid pressure thereto for actuating said piston, a valve casing positioned above said pump barrel, said caslng provided with an inlet port and an outlet port communicating adapted for reciprocation and controlling said inlet and said outlet ports for controlling the operation of the pump, a stationary valve seat within the valve casing for one of said heads and a movable valve seat within the casing for the other valve head, whereby said valve seats compensate for wear.

15, A unitary control and working valve for a deep well pump of the character herein described, comprising a valve rod provided with spaced pistons having differential diameters a pressure supplying mechanism for supplying liquid under pressure acting against said pistons, means to reciprocate said pistons, and the differential in pressure upon the diHerential heads serving to `hold said pistons against reciprocation after they have been moved to their respective positions.

16. A fluid ressure actuated well pump including an in et pipe and an outlet pipe, a pumping mechanism having a pump barrel in communication with and forming acontinuation of said inlet pipe, a pump piston in said pump barrel, a pressure mechanism communicating with and delivering fluid under pressure to the inlet pipe for actuating.

said plston, and a unitar valve for said pumping mechanism positloned to alternatemea-ia? ly direct the pressure Huid above and below said piston and to direct the discharge of a pumping mechanism having a pump barrel in communication with and forming a continuation of said inner pipe, a piston in said pump barrel, means carried by the outer pipe for removably supporting the pumping mechanism, a pre sure mechanism communicating with and upplyingfluid under pressure to the innerf pipe for actuating said piston, and a unitairy valve for said pumping mechanism positioned and functioning to alternately direct the pressurev fluid above and below said pistonand to direct the discharge of pumped iiuid up the outer pipe.

18. A fluid pressure actuated well pump including a pressure conveying pipe and a discharge pipe, a pumping mechanism having a pump barrel and a piston therein, said barrel in communication with and forming an extension of said pressure pipe, a pressure l mechanism in communication with and delivering liquid under pressure to said pressure pipe, and a valve positioned to direct the pressure uid to alternately raise and lower said piston and to direct the fluid pumped by said piston up said discharge pipe.

19. A fluid pressure actuated well pump including an inner and an outer pipe, a pump barrel having therein a pair of pistons in spaced relation and connected by a hollow plunger, a unitary working and control valve, a casing for said valve having communication with both of said pipes and the pump` barrel, said hollow plun er communicating with the pump barrel an with the well, one of said pistons adapted to lift fluid from the well into said hollow lunger and pump barrel, the otherof said pistons adapted to pump the fiuid from said pump barrel, a ressure mechanism for supplying liquidun er pressure to said valve casing, and said unitary valve positioned and constructed to direct said pressure liquid to reciprocate said pistons and to direct the discharge of pumped fluid from the pump barrel through one of said pipes.

20. A fluid pressure actuated-well pump including an inner and an outerpipe, a pump barrel having therein a pair of pistons in spaced relation and connectedby a, hollow plunger, a valve casing having communication with both of said pipes and the pump barrel, a unitary working and control valve mounted for reciprocation in said casing, a connection between said valve and said pistons for reciprocating said valve, said hollow plunger communicating with the pump barrel andl with the well, one of said pistons adapted to lift fluid from the well into said hollow plunger and pump barrel, the other of said pistons adapted to pump the fluid from said pump barrel, a pressure Amechanismfor supplying` liquld under pressure to saidl valve casing, and said umtary valve automatically shifted by its connection to the pistons and Huid both of said pipes communicating with 4 the pump barrel, a liquid pressure supplying mechanism communicating with the pressure inlet pipe and supplying liquid under pressure to said pump barrel for actuating said piston, a unitary working and control valve including a valve housing forming a part of the conduits constituting said pressure inlet and fluid outlet pipes, said housing having communication with said pump barrel, a valve mounted for reciprocation in said housing and having a pair of heads of differential diameter in spaced relation, means for reciprocating the valve heads to control and direct the inlet andoutlet of fluid to and from said pump barrel, and said valve being held in position by the differential pressure of the liquid pressure present in the valve housing between the valve heads.

22. A deep well pump of the character herein described, including a pump barrel having therein apiston, a fluid pressure inlet pipe anda pumped fluid outlet pipe both of which communicate with said pump barrel, a liquid pressure supplying mechanism communicating with the inlet pipe and supplying liquid pressure thereto for delivery to the pump barrel for actuating .said piston,`

- fluid from the a unitary working andcontrol valve mounted for reciprocation within a casing, said casing constituting a by-pass of the pressure inlet pipe and a conduit for connecting the outlet pipe with the pumping mechanism, said casing having a port communicating with the inlet pipe, said control valve comprising a stem carrying thereon in spaced relation pistons of differential diameters, means for moving said valve a predetermined distance within said casing to permit one of the valve pistons to open the pressure inlet port above or below said valve piston, whereby the fluid pressure. is permitted to enter the valve casing' above or below the valve operated devices comprising a hollowvalve stem having at its ends two heads of difl'erential diameters, Valve seats for said heads, and movable means in conjunction with said valve seats for compensating for wear.

24. valve mechanism for fluid pressure operated devices comprising a valve casing having an inlet and an outlet port therein, a valve comprising a stem having at its opposite ends heads of differential diameters, said stem and heads reciprocable within said casing and movable valve seats within said casing for one of said valve heads. f

25. A valve mechanism for fluid pressure operated devices comprising a valve casing having mounted therein for reciprocation a rod having thereon two heads, said rod being hollow and passageways through said heads communicating with and forming a continuation of said hollow rod opening, and valve seats in said casing for said heads.

26. A valve mechanism for fluid pressure operated devices comprising a valve casing having mounted therein for reciprocation a hollow rod having thereon two heads of d1fferential diameters, passageways through said heads communicating with and formmg a continuation of said hollow rod, and valve seats in said casing for said heads.l

Signed at Denver, Colorado, this 1st vday I of July, 1924.

IRAy B. HUMPHREYS.

piston to move it further through the difl'erential pressure present between the spaced pistons of the valve, and said valve through its movement automatically diverting the the pressure fluid above and below the pump piston and directing the flow of discharge pump barrel, for the purpose described.

23. A valve mechanism for fluid pressure

Images