US2684631A

US2684631A - Pump and valve assembly

Info

Publication number: US2684631A
Application number: US224853A
Authority: US
Inventors: William C Anthony; Glenn S Park
Original assignee: ANTHONY
Current assignee: ANTHONY
Priority date: 1951-05-07
Filing date: 1951-05-07
Publication date: 1954-07-27
Anticipated expiration: 1971-07-27

Description

y 1954 w. c. ANTHONY EI'AL PUMP AND VALVE ASSEMBLY Filed May 7, 1951 4 Sheets-Sheet l Jfzfarn eyo' July 27, 1954 w. c. ANTHONY ETAL 2,684,631

PUMP AND VALVE ASSEMBLY Filed May 7, 1951 4 Sheets-Sheet 2 7 I T15 16 2 111 a 25 7 14 20 17 J) 29 a I i Q: 18 m Ill/l 4 I I I28 :5 I ix 1/ a 34- 2 7 4f 2/ y .Zfivenfar Zfli/Zzam C. Jnzony Glen Sfar an.

IIXZ arneyJ y 27, 954 w. c. ANTHONY ETAL 2,684,631

PUMP AND VALVE ASSEMBLY Filed May 7, 1951 4 Sheets-Sheet 3 231??? zoi" Zl/i/Zz'aw C. .lizfony 6 (e74 2? 5. Park y 1954 w. c. ANTHONY ETAL ,68

PUMP AND VALVE ASSEMBLY Filed May 7, 1951 4 Sheet s-Sheet 4 59 5? re 7 4 E91] jzevenzars Z'i/Zfam (14 72525023 5 7 5 9 I fiffarneys Patented July 27, 1954 UNITED STATES PATENT OFFICE William 0. Anthony and Glenn S. Park, Streator, 111;; said Park assignor' to said Anthony A plication May 7; 1951, Serial No. 224,853

20' Claims. 1

This invention relates to a pum and has for one object to provide a pump and pump control.

It has for another object to provide controlling means which may be associated with a pump, which controlling means may be readily operated from the outside of the pump.

Another object is to provide a rotating valve in connection with a pump which may be readily operated from a point external from the valve housing.

Another object is to provide a controlling valve in connection with a gear pump and to provide a valveso arranged that it is substantially balanced and may be freely and readily operated.

Other objects will appear from time to time throughout thev specification and claims.

The invention is illustrated more or less diagrammatically in the accompanying. drawings, wherein:

Figure 1 is a sectional view through the pump illustrating parts. in section and parts in elevation;.

Figure 2 is a longitudinal section taken at line 22 of Figure 1;

Figure. 3'is an elevation of thevalve operating member removedfrom the pump housing andassociated parts;

Figure 4 is a transverse sectional view'taken at line 4 iof Figure 1;

Figure 5 is an outside end elevation in" a reduced'scale;

Figure 5 is a. sectional detail taken on line 6-6 of FigureZ;

Figure 7 is a sectional detail taken-at line1--'| of Figure'z Figure 8 is a similar view showing thevalve ina different position of adjustment; and

Figure 9 is a front view of the inner pump hous ing member.

Figure 10 is a sectional View showing a modification of the device in which the valve assembly, although generally similar to that shown in'the earlier figures, is contained in ahousing separate from the pump;

Figure 11 is a section taken at line llll of Figure 10;

Figure 1.2is a transverse section taken'at line 12-42 of Figure 10; and

Figure 13 is a diagrammatic plan view showing the separate valve housing incircuit'in'a system which includes a pump.

Figure 14 is a sectional detail,- one reduced scale, showing a modified form of pump shaft construction.

Like parts are indicated by like characters throughout thespeciflcation and the drawings;

The pump comprises a housing, a pair of meshing gears, a valve assembly and valve operating means. The housing includes generally a central or inner member in which the gears are positioned, and two side plates which close the housing and which, with the central member, form the full pump housing. I is a central or inner pump housing member. and 9, this member is shaped to provide two main

gear retaining cavities

2 and 3. It is shaped also to provide an inlet or low-pressure passage 4 and an outlet or high-pressure passage 5. It may be widened as at 6 to provide a plate-like extension by means of which the pump maybe attached and, if desired, it may be provided, intermediate thatpart which contains the gears and the enlargement 6, with a reduced portion 1 within which the controlling valve is located.

The passage 815 formed between the inlet passage 4 and the outlet passage 5-. One side of the housing I is closed by a cover plate or com;- parable member 9, which may be enlarged at It], and is generally held removably in place upon the member I by screws II or otherwise. The memher 9 is provided with cavities suitable to receive the shafts or other members upon which the gears are supported.

Within the member 1, as above mentioned, is a cavity adapted to receive'and support a combined check and relief valve and the'controls therefor. This valve includesa cage 12 positioned within the upper or discharge outlet of the upper or highpressure passage 5. As shown; the cage is provided with an inwardly bent lower or inner end !3 which forms aseat for a ball M; A spring l5 bears at one end against the ball and at-the other on a' pin l6 which extends across the cage. The spring is biased to hold the ball seated.

Positioned within the passage 8, which extends from the intake or low-pressure side 4 to the 'high-pressure side 5 of thepump housing, is a'valvemember ll. This is a-generally flat member and it is shaped as shown particularly in Figures? and 8 with two perforations or openings i 3, l8'=form'ed through it.

A valve and a valve shifting member are positioned in line withthe spaces or perforations i8 and in line with the-valve member IT. The valve member itself is of butterfly shape, as shown particularly

inFi'gures

6 and 8, and comprises two oppositely placed segmental valve members I'9, l9 which are of equal size and are preferably integral with the valve shifter shaft 29. This shaft is-provided with an enlarged bearing portion 21 positioned'intermediate itsends, and with a reduced: and flattened or cut-away part 22.

As shown in Figures 2 Positioned opposite the part 22 is a raised rounded portion 23 which is concentric with the shaft and with the axis of rotation of the valve portions I9.

As shown in Figure 2, the valve portions is are positioned in contact with the valve member I! and in contact with the surface of the perforation or opening 18. The bearing portion ft of the shaft 26 is received in a bearing 2 fixed in an opening in the housing portion 1,

Suitable sealing members

25 and 26 are positioned to seal the bearing or bushing 26. The member 25 is in contact with the housing I and member 28 is in contact with the bearing portion 2!. Sealing means of any desirable type may be provided exteriorly of the bearing portion 2:. As shown in Figure 2, these means comprise a number of packing glands, washers and the like, designated generally by the numeral 21. The invention is obviously not limited to any particular sealing means in this respect.

An operating lever or handle 28 is positioned upon the outer or free end of the shaft is and may be secured thereto by a pin is or otherwise. A second cover plate 36 is positioned on the opposite side of the pump housing by screws 3! or otherwise, and this cover plate is perforated to permit the passage of a driving shaft.

As Shown in detail in Figure 1, a driving shaft 32 passes through a portion 33 of the cover plate and is fixed to a gear 35. An anti-friction bearing 35 is positioned about shaft 32 with any suitable cavity 36 formed within the cover plate 30. Packing and equivalent means 31 are positioned about the shaft 32 within a cavity 38 formed in line with and exteriorly of the cavity 36. At its opposite end, the shaft 32 is received in a suitable bearing formed in the cover plate 9. This construction is indicated diagrammatically at 38 in Figure 1. The invention is, of course, not limited to the particular details of bearings or bearing supporting means, and any suitable gear construction and gear journalling and driving means may be used without departing from the spirit of the invention.

A second gear at is in mesh with the gear 34 and is carried on a shaft H which, at one end, is supported in a suitable bearing carried by the cover plate 9 and, at the opposite end, is supported in a suitable bearing covered by the cover plate 39.

Preferably integral with the cover plate 35, there is formed a pressure relief assembly. This includes, as shown generally in Figures 1 and 4, a passage 42 in communication with the inlet or suction chamber 4 of the pump housing, and a second passage 43 in communication with the outlet or high-pressure passage 5 of the pump housing. The pump housing member is suitably ported at 64 and 45 to provide communication between the passages 32 and d4, respectively, and the

passages

43 and 55, respectively. The outer or discharge end of the passage 43 is tapered or otherwise shaped as at MS to provide a seat for a ball-check valve 4?.

A piston it is positioned to bear against the ball i! and to control the flow of fluid from the passage d3 into the passage d2. This piston 48 is held in contact with the ball El and the latter is normally held closed by a spring as which bears at one end against the inner face of the bypass piston 48 and, at the other end, bears against the adjustable plug 56. This plug is threaded and is adjustably received in a corresponding threaded opening in the extension 5i, which is 4 preferably integral with the cover plate 30. The bypass valve 58 may be exteriorly grooved or cut away as at 52 and a perforation or passage 53 passes from the cut-away portion 52 to the interior of the valve member 48.

To permit a rearrangement of the relative position of the pump housing and the cover plates to compensate for a difference in the direction of rotation of a power take-off or other drive, certain passages and ducts, additional to those above described and corresponding to them, are present, both in the pump housing I and the cover plate 30. In Figure 4, the

passages

42 and 43 appear in full lines and are connected to passages as and 45, respectively, which are in communication with the low pressure side t and the high-pressure side 5 of the housing. For certain purposes which will be described more fully below, it is desirable to reverse the cover plates from the position shown in Figures 1 and 4. When that reversal is made, the cover plate 9 is positioned on the left side of the pump housing l and the cover plate 30 is positioned on the right side of the pump housing I. The use of the words, right, and left, in the sentence just above applies to the showing of the device as they appear in Figures 2 and 4.

To permit this reversal of cover plates and to insure the proper connection of the pressure relief assembly with the highand low-pressure sides of the pump, a branch 52 is connected to the passage 42 and inclined downwardly. It enters or is in communication with the passage 42 through an opening 42 Similarly an inclined branch 13 is positioned generally below the plane of the passage 53. It is in communication with the passage 43 through the opening 43 Communicating respectively with the highand low-

pressure sides

5 and 5 of the pump housing I are

passages

44 and 45 These members or passages are positioned, as shown in Figure 9, below the corresponding passages M and 45.

When the parts are assembled as shown in Figure 4, the

branch passages

42 and 43 are inactive. They are below the

passages

44 and 45 and are sealed off. When the parts are reversed so that the cover plate 39 is on the right-hand side of the housing I and the cover plate 9 is on the left-hand side of the housing i, the passages id and E5 are sealed by the cover plate 9 and the outer ends of the

passages

42 and 43 are sealed by their contact with an imperforate portion of the pump housing. The branch passages 42 and 453 are then in communication with the passages or

openings

64 and 35 of the pump housing I. Thus, whether the cover plate 30 be on the lefthand side of the pump housing I as shown in Figure 4, or be reversed and attached to the righthand side of the housing I, the passage 42 is always in communication with the low-pressure side l of the housing and the passage 43 is always in communication with the high-pressure side 5 of the pump to permit pressure relief when necessary by movement of the ball 4'1 away from the seat 48 and by movement of the valve 48 out of the position shown in Figure 4, in which it blocks the flow of fluid in the outlet direction from the passage 43 to the passage 32.

Generally speaking, the valve assembly as shown in Figures 10 to 13, inclusive, comprises the same control valve shown in the earlier figures. In the earlier figures, the control valve is mounted in a suitable cavity or chamber formed in the pump housing, and the other valve is also positioned in a cavity formed in the pump housing. In the form of Figures 1-0 to '13, these valves operate as they do in the earlier form. They are, however, merely enclosed in a separate housing which may be any place in the-pump system.

4-9 is a housing provided with a passage 50 through it. This passage is threaded at each end, as at 5| and 52.

Conduits

53 and 54 are positioned, respectively, in the threaded portions 5| and 52; The conduit 54 may be connected to a pump housing 55. The flow of liquid to the pump will be generally in the direction of the arrow shown in the conduits 5'3 and '54. A second conduit- 55 is, connected with the pump 55 and comprises an outlet or high pressure path. The conduit 56 is connected to a threaded opening 51 formed in the valvehousing 49. A conduit 58 is connected to the housing 49 and comprises the outlet conduit or path for high pressure fluid. The direction of flow of the high pressure fluid is indicated by the arrows on the conduits 5B and 58, as shown in Figure 13.

The valve housing 49 thus contains a low pressure chamber or passage 50 and a high pressure chamber or passage 59. Between these chambers is a passage 60' which may be closed. This passage 60' is comparable to the passage 8' as shown in Figure 2 and is closed by a valve which is identi'cal' with the valve [9 of the earlier figures. Since this control valve is identical in both forms of the invention, the same reference numerals are applied to it in both forms and it is not red'escribed herewith. Ordinarily, this valve is interchangeable so that it may be applied to a device as shown in Figure 2 in which the valve is assembled in the same housing as that in which the pump is positioned or-to a device in which the pump is in one housinga'nd'the valve in another, as shown in Figures 10 to 13, inclusive. The valve, the sealing means and the valve operating means are all the samein all forms of the figures. The opening or passage 60 is partially closed by a plate 6'! which is provided with a plurality of perforations or openings 62. The plate corresponds to the plate ll of Figure 2 and the

openings

62, 52 correspond to the openings t8 of Figures 7 and 8, in particular.

Positioned also within the housing 49 is an outlet ball check valve identical with the outlet ball check valve shown in Figure 2. Since the parts are identical and their function is identical, they are interchangeable and the same reference numerals are. applied to the same parts in both figures and they are not redescribed'herewith. The cage i2 is positioned in the outlet or high pressure passage of the housing 49 with which the-conduit 58 is in communication.

Where the control valve is mounted in a separate housing, a pressure relief system may be applied, and it is generally the same as that shown in the earlier figures. It comprises a ball check valve 63 positioned to be seated in a tapered seat 64 which communicates with a passage 55. The passage 65 is in communication with the high pressure chamber 59; The tapered seat 54 comprises an enlargement of the passage 55 and the tapered portion communicates with a cylindrical cavity 56 within which is positioned a pistonlike member 6?. The ba'11,63 bears against the closed end of the member 67, and a spring v68 is positioned within the member 61' and bears at one end against the closed'partof'that' member, and at the other end bears against an adjustably positioned "closing plug 69, which latter is received in a threaded seat 19 formed in'a suit- I able portion or extension of the housing 49. A

peripheral groove '1 I may be formed in the member 51 and may be provided with a perforation 1-2 communicating with the interior of the member 51. A passage 13 communicates with the cylindrical chamber '66 and finally communicates with the low pressure chamber 50. This pressure relief assembly, including the ball check valve 63 and the member 61, is substantially the same as the corresponding members shown in the earlier figures, such as the ball 41, the piston 48 and the passages which lead to the chamber in which the piston is positioned.

Although we have shown an operative formof our invention, it will be recognized that many changes in the form, shape and arrangement of parts can be made without departing from the spirit of the invention, and our showing is therefore to be taken as, in a sense, diagrammatic.

The use and operation of this invention are as follows:

With the parts assembled as shown, the pump will be positioned on a base or support of any suitable construction and will be associated with driving means. Frequently a pump of the type disclosed will be positioned on an automotive vehicl'e where hydraulically actuated equipment is present. This may include tipping or elevating devices actuated by hydraulic piston and cylinder assemblies. If that is the case, the pump will be connected to such a device and will normally be operated by the engine of the vehicle. This type of use and association is mentioned merely as being typical of one use for which the pump of the present invention is adapted.

It is adapted also for many other uses. However used, it will be connected to a mechanism intended to be operated by hydraulic fluid under pressure and the shaft 32 will be driven, With the shaft being driven in the direction of the arrow of Figure 2, the gear 34, of course, rotates with it, and the gear 45 in mesh with the gear 34 rotates in the opposite direction, as indicated by the arrow on the shaft 4|. Fluid is thus carried by the gears from the low-pressure side 4 to the high-pressure side 5. For normal operation, the valve member l9 will be closed in the position of Figure 7. As pressure builds up on the high-pressure side, it will displace the ball l4 against the resistance of the spring I 5 and highpressure fluid will be discharged through the cage l2 and to the point of use. When for any reason pressure on the high pressure side falls sufiiciently, the ball M will be reseated by the spring 15.

Pressure relief means are also provided in the system. One purpose of a pressure relief means is to prevent the development of excessive pressures. The structure illustrated in plan in Figure 4, and shown also in Figure l, is concerned primarily with the pressure relief mechanism. The cover plate 36' contains the

passages

42 and 43. These passages, by means of one or the other of the passages 4t and #35, are connected respectively with the low-pressure chamber or side 4 of the pump and the high-pressure chamber or side 5.,

The plug 59 is adjusted to give the desired pressure to the spring 49. Obviously, springs of various sizes might be used and, in that event, the adjustment is accomplished by selecting the proper spring rather than by adjusting the plug 59. In either event however, the parts are chosen or adjusted to apply,,to the plunger 48, the right degree of resistance'to movement in the outward direction. The plunger in the closed position,

as shown in Figure 4, closes the passage 42 and bears against the ball 47. Upon the occurrence of pressure above a predetermined maximum in the high-pressure side 5, the ball check valve all will be moved outwardly from the seat 15 and will move the plug it against resistance of the spring 49 and, thus, the passage 353 is opened and high-pressure fluid may be bypassed through the passage Q3 and the passage 32 to the lowpressure side i of the pump.

As long as power is thereafter applied to the pump, it may continue to generate the maximum pressure and the bypass may remain open. This operation would be satisfactory for relatively short periods with the ball alone but, should it be necessary to continue pump operation at speeds suiiicient to generate the maximum pressure, excessive heating of the fluid within the pump may develop. For this reason, the plunger type valve G8 is necessary. The plunger or trunk type valve, in addition to the ball valve, comprises a diiferential piston. It is to be understood that the plunger 43 might be omitted and the spring is shaped to bear directly upon the ball 3?. In that case, the pressure relief valve would be a simple or conventional ball check relief valve. The addition to the ball valve of the plunger t8 produces a difierential piston action. The ball comprises a primary valve and is held against its seat by the compression of the spring. The area of the ball exposed to pressure within the passage 33 is considerably less than the cross sectional area of the cavity within the valve 33 is positioned. If the spring be so proportioned that the ball will be lifted from its seat at a predetermined pressure of 12 pounds per square inch, it will be found that, after it has been lifted by this pressure, the pressure flows around the displaced ball and contacts the secondary valve member, the plunger (it. This piston or plunger valve is moved outwardly against the compression of the spring as and, because its exposed area is several times greater than that of the ball on the seat opening, the plunger will be held open by a pressure which is substantially less than that required to open the ball. Thus, the pump may continue to operate and to run at almost idling speed and, after the valve 43 has once been unseated by pressure, the pressure will continue to be relieved without the necessity of high-pressure generation, and the pump may operate at very low pressure.

A main controlling means comprises the valve assembly shown generally in Figure 2, and illustrated in part in Figures 6, 7 and 8. When the valve operating means are in the position of Figure 2, which is the position for delivery of fluid, under pressure, outwardly through the valve cage l2 the projection 23 is out of contact with the ball ill and the position of the projection 23 is thus different from that which it occupies in Figure 6, which is the position for the return of fluid inwardly through the valve cage i2. In Figure 2, the ball, to some degree, projects within the flattened or cut-away portion 22 of the shaft 26. This is the position, also shown in Figure 7, in which the valve parts is wholly cover the ports or openings ES and, thus, completely block the passage 8 and prevent the bypassing of pressure fluid from the high-pressure side to the low-pressure side of the pump.

If now it becomes desirable to permit bypassing of fluid from the high-pressure side to the low-pressure side, the shaft 29 is rotated by the handle 23. A slight movement from the position of Figure 7 will partially open the ports 18 and a considerable movement in the opening direction may occur before the enlargement 23 contacts the ball. Thus, the first movement of the shaft 23 from the position of Figure 2 toward that of Figure 5 will open or uncover the ports hi to some degree without contacting the ball. Ordinarily, the ball itself will be raised from its seat by pressure on the high-pressure side at the time when the valve 19 is to be moved to uncover the ports. The only time when this is not the case is when the pump has stopped operation or not operating at maximum speed and it is desirable to open the ball 54 to permit fluid to return to the pump from a cylinder or other mechanism into which it has been previously forced.

In any event, as the movement of the shaft 20 is continued to bring the projection or raised portion 23 from the downward position of Figure 2 to the upper position of Figure 6, the member 23 presently comes in contact with the ball 14 and raises it from its seat. As shown in Figure 6, the ball is fully raised from its seat. Since the ball contacting surface of the member 23 is arcuate and is concentric with the axis of rotation of the shaft 23, the ball will be fully raised from the seat for many positions of adjustment of the shaft 29. It is possible, by adjusting the shaft, to raise the ball it from its seat fully, as shown in Figure 6, when the ports i8 are closed and, by a different adjustment of the shaft 20, it is possible to raise and hold the ball 14 out of contact with the seat when the ports 83 are wholly or partially uncovered. The member 23, as shown in Figure 6, projects into the cage l2. This is due to the fact that this member is of greater diameter than the shaft portion 26 or the enlarged portion 2 i. It projects outwardly beyond either of these, and, thus, it projects into the cage and accomplishes a greater raising of the ball 24 than would be possible if its diameter were less.

The device includes the pump and the valve assembly. They may be together in a single housing, as shown, or they may be in separate housings, as shown. The control valve and the automatic bypass valve are shown as present in both forms of the device. The automatic bypass valve may, however, be omitted, if desired, from either form of the device. The operation of the control valve is distinct from the operation or presence of the automatic bypass valve.

The operation thus far described applies to the parts when assembled as shown. Since, as above noted, the device finds one important use as a driving means for hydraulic mechanisms carried by trucks or other automotive vehicles, it will frequently be driven through the power take-off of the vehicle engine. Such power take-offs in some mechanism of vehicles rotate in one direction and, in other mechanisms, rotate in the opposite direction, and means are provided in the structure of the present invention to permit operation of the pump by rotation in either direction. The low-pressure side ll of the pump is always the low-pressure side, and the highpressure side 5 of the pump is always the high-pressure side. With the parts as shown, rotation of the driving shaft 32 is in counterclockwise direction, and it may be assumed that the power take-off drive connected to this shaft is in counter-clockwise direction. If the power take-off drive be in clockwise direction, some adjustment must be made to permit the rotation 9 of the gears in proper direction to discharge the fluid under pressure into the high-pressure side 5. This may be accomplished in a number of Ways. The one shown is as follows:

The

cover plates

9 and 30 are removed from the pump and the pump body is rotated through 180 degrees and the cover plates are then reattached to the pump body. This is, in effect, to reverse the cover plates from the positions shown in Figures 1 and 4 so that the cover plate 9 lies on the left-hand side of the pump housing I and the cover plate 36 lies on the righthand side of the housing I. In that position, the

passages

42 and 43 are blocked at their outer ends by the cover plate 9 or the gasket positioned between it and the housing I. This also closes or blocks the

passages

44 and 45. However, the

branch passages

42 and 43 are thus brought into communication, respectively, with the passages M and e5 and this rearrangement of the parts still provides a system of passages through which high-pressure fluid from the high-pressure side 5 reaches the ball valve 4? and, if the pressure is sufiicient to raise that valve and the plunger type valve 48, high-pressure fluid will be bypassed through the branch 43 the valves '4'! and 48, and finally through the branch 4-2 into the low-pressure side 4. Thus, means are provided to permit the relative arrangement of the pump housing and cover plates so that, without the addition or substitution of any parts, that arrangement may be selected which provides a proper adjustment to permit driving of the pump from a power take-01f or other driving means which operates either counter-clockform of Figures 10 to 13, inclusive, is substam tially the same as that shown in the earlier figures in which the valves are positioned Within the pump housing instead of being positioned within a separate valve housing. The rotary valve member, including the portions It to 23, inclusive, are identical in both forms of the invention, and their operation is identical and need not be redescribed. The pressure relief valve system comprising the ball 53 and the piston 61 are the same as those described above in connection with the earlier figures, When pressure on the high-pressure side of the system becomes sufficient, the ball 63 is unseated by that pressure, and when it has been unseated, the closed end of the piston 67 is unseated, and this, having a greater area exposed to the high pressure than would the ball 63, will be held open with a pressure less than that required initially to move the ball 253 to the open posi-- tion. Once the ball 63 and piston El have been opened, pressure is relieved through the passage 65, past the seat 64 and through the cylindrical cavity 56 and finally through the passage 73. So long as the pressure on the high-pressure side of the system remains sur'ficiently high to hold the piston valve e1 open, pressure is re- .lieved .from the high-pressure side to the lowmay bepositioned anywhere in the system which Iii will normally include a pump, a member to be operated by fiuid pressure and the necessary conduits. The member operated by the fluid pressure will frequently comprise a piston and cylinder assembly, and. these are not shown herewith as the invention is not limited to any particular design of piston and cylinder assembly.

In the modified form of Figure 14, both gear shafts 32 and ii extend outwardly from the pump body. To permit this, the cover plate 14 is substituted for the cover plate 39, and two passages are provided through members 15 and it for the shafts 32 and M respectively. The same bearing and packing means, as shown in Figure 1 and described in connection with that figure, are also used in connection with the form of Figure 14. For that reason these parts will not be re-described in connection with that figure. The purpose of the construction of Figure 1%, as pointed out above, is to provide two shafts, each extending outwardly from the pump casing, and each of which may be driven by the power take-off shaft. If one shaft is driven the pump will operate in one direction, and if the other shaft is driven the pump will operate in the opposite direction. Thus, by the use of a selected shaft, the pump may be driven from a previously installed power take-off to operate either clockwise or counterclockwise.

We claim:

1. In combination in a housing member, said housing member shaped to define a low and a high pressure passage, a ball check valve positioned to control the passage of high pressure fiuid outwardly through said high. pressure passage, said housing being shaped to provide a communication between said high and said low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to raise said ball check valve from its seat, and spring means biased to hold said rotary valve member in contact with the member in which said openings are formed.

2. In combination in a housing member, said housing member shaped to define a low and a high pressure passage, a ball check valve positioned to control the passage of high pressure fluid outwardly through said high pressure passage, said housing being shaped to provide a communication between said high and said low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to raise said ball check valve from its seat and to penetrate inwardly beyond its seat, and spring means biased to hold said rotary valve member in contact with the member in which said openings are formed.

3. In combination, a housing member, said housing member shaped to define a low and a high pressure passage, a ball check valve positioned to control the passage of high pressure fiuid outwardly through said high pressure passage, a seat for said check valve, said housing being shaped to provide a communication between said high and low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to extend inwardly beyond said check valve seat and to raise said ball check valve from its seat, means adapted to hold said rotary valve member in contact with the member in which said openings are formed, a passage joining said high and low pressure passages, a plurality of valve member positioned in said passage, said last mentioned valve members comprising a ball, a spring member and a plunger, said plunger being normally in contact with said ball and said spring member being effective to urge said plunger and said ball to passage closing position.

4. In combination, a housing member, a low and a high pressure passage through said housing, a ball check valve positioned in said high pressure passage, a seat therefor, a second passage leading from said high pressure passage to said low pressure passage, a member positioned in said second passage being provided with a plurality of openings, a valve positioned adjacent said member to close said openings, a shaft for rotating said valve to move it to open or closed position, and a part on said shaft adapted, when suitably positioned, to contact said first mentioned ball check valve, to extend inwardly beyond its seat and to move said valve in the opening direction.

5. In combination in a pump, a housing member shaped to provide a pumping chamber and fluid ducts, a pair of meshing gears positioned therein, an inlet and an outlet passage communicating with said pump chamber, a pair of cover plates adapted to be attached to and to close said housing, a bypass valve positioned to bypass fluid from the high pressure side to the low pressure side of said pump, said bypass including a fixed ported member, a rotary shaft, a valve member carried by said shaft in contact with said ported member at all positions of rotation of said shaft, and means for adjusting said shaft to adjust said second valve member into desired position.

6. In combination in a pump, a housing member shaped to provide a pumping chamber and fluid ducts, a pair of meshing gears positioned therein, an inlet and an outlet passage communicating with said pump chamber, a pair of cover plates adapted to be attached to and adapted to close said housing, a bypass positioned to bypass fluid from the high pressure side to the low pressure side of said pump, said bypass including a fixed ported member having a flat face, a rotary shaft, a valve member having a flat face and carried by said shaft in contact with the flat face of said ported member at all positions of rotation of said shaft, and means for adjusting said shaft to adjust said second valve member into desired position.

7. In combination in a pump, a housing member shaped to provide a pumping chamber and fluid ducts, a pair of meshing gears positioned therein, an inlet and an outlet passage communicating with said pump chamber, a pair of cover plates adapted to be attached to and adapted to close said housing, a bypass valve positioned to bypass fluid from the high pressure side to the low pressure side of said pump, said bypass including a fixed ported member, a rotary shaft, a valve member carried by said shaft in contact with said ported member, means for adjusting said shaft to adjust said second valve member into desired position, and a ball check valve positioned on the pressure side of said pump housing, said rotary valve adjusting means provided with a part to contact said ball in a suitable position of adjustment to raise the same.

8. In combination in a pump, a housing member shaped to provide a pumping chamber and fluid ducts, a pair of meshing gears positioned therein, an inlet and an outlet passage communicating with said pump chamber, a pair of cover plates adapted to be attached to and adapted to close said housing, a pressure relief passage formed in one of said closure plates, said pressure relief passage formed in said cover plate being so disposed that it will communicate with the same fluid ducts when fastened to either side of the pump housing, a bypass valve positioned to bypass fluid from the high pressure side to the low pressure side of said pump, said bypass including a Xed ported member, a rotary shaft, a valve member carried by said shaft in contact with said ported member, means for adjusting said shaft to adjust said second valve member into desired position, and a ball check valve positioned on the pressure side of said pump housing, said rotary valve adjusting means provided with a part to contact said ball in a suitable position of adjustment to raise the same.

9. In combination in a pump, a main housing member, said housing member shaped to define a pumping chamber, a low and high pressure passage communicating with said pump chamber, a ball check valve positioned to contro1 the passage of high pressure fluid outwardly through said high pressure passage, said pump housing being shaped to provide a communication between said high and said low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to raise said ball check valve from its seat, closure means for closing said housing member, a pair of meshing gears positioned in said pump chamber, shafts supporting said gears, and spring means biased to hold said rotary valve member in contact with the member in which said openings are formed.

10. In combination in a pump, a main housing member, said housing member shaped to define a pumping chamber, a low and a high pressure passage communicating with said pump chamber, a ball check valve positioned to control the passage of high pressure fluid outwardly through said high pressure passage, a seat for said check valve, said pump housing being shaped to provide a communication between said high and low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to extend inwardly beyond said check valve seat and to raise said ball check valve from its seat, a pair of cover plates adapted to be positioned on said housing member, a pair of meshing gears positioned in said pump chamber, shafts supporting said gears, one of said shafts extending through a cover plate, means biased to hold said rotary valve member in contact with the member in which said openings are formed, a passage joining said high and low pressure passages, a plurality of valve members positioned in said passage, said last mentioned valve members comprising a ball, a spring member and a plunger, said plunger being normally in contact with said ball and said spring member being effective to urge said ball and plunger one toward the other to close said passage.

11. In combination in a pump, a main housing member, a plurality of cover plates adapted removably to be positioned upon said housing member and forming with said housing member a pump chamber, a low and a high pressure passage to and from said chamber, a pair of meshing gears positioned within said pump chamber, a ball check valve positioned in said high pressure passage, a seat therefor, a second passage leading from said high pressure passage to said low pressure passage, a member positioned in said second passage being provided with a plurality of openings, a valve positioned adjacent said member to close said openings, a shaft for rotating said valve to move it to open or closed position, and a part on said shaft adapted, when suitably positioned, to contact said first mentioned ball check valve, to extend inwardly beyond its seat and to move said valve in the opening direction.

12. In combination in a pump, a main housing member, said housing In amber shaped to define a pumping chamber, a low and a high pressure passage communicating with said pump chamber, said pump housing being shaped to provide a communication between said high and low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, closure means closing said housing member, a pair of meshing gears positioned in said pump chamber, shafts supporting said gears, and means biased to hold said rotary valve member in contact with the member in which said openings are formed, a check valve positioned on the discharge side of said pump and comprising a member and a seat therefor, a part on said valve shaft shaped and dimensioned in one position of adjustment to extend inwardly beyond said seat and to raise said valve member.

13. In combination in a housing member, said housing member shaped to define a low and a high pressure passage, a check valve positioned to control the passage of high pressure fluid outwardly through said high pressure passage, said housing being shaped to provide a communication between said high and said low pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to raise said check valve from its seat.

14. In combination in a housing member having a high and low pressure passage therein, a

check valve having a, movable member and posil tioned to control the passage of hi h pressure fluid outwardly through said high passage, said housing being shaped to provide a communication between said high and said low pressure passages, said communication including an opening, a rotary valve member positioned to control said opening, a shaft for said rotary valve member, a check valve-opening member associated with said shaft and adapted on rotation of said shaft to contact said movable check valve member and to open said check valve.

15. In combination in a housing member, said housing member shaped to define a low and high pressure passage, a check valve positioned to control the passage of high pressure fluid outwardly through said high pressure passage, said housing being shaped to provide a communication between said high and said low pressure passages, said communication including an opening, a rotary valve member positioned to control said opening, a shaft for said rotary valve member, a part on 14 said shaft adapted in one position to raise said check valve from its seat and to penetrate inwardly beyond its seat.

16. In combination in a housing member, said housing member shaped to define a low and a high pressure passage, a check valve positioned to control the passage of high pressure fluid outwardly through said high pressure passage, said housing being shaped to provide a communication between said high and said loW pressure passages, said communication including a plurality of openings, a rotary valve member positioned to control said openings, a shaft for said rotary valve member, a part on said shaft adapted in one position to raise said check valve from its seat, and means associated with said housing and with said shaft to hold said rotary valve member in contact with the member in which said openings are formed.

17. In combination in a housing member usable in pumps and the like, said housing being shaped to define a low and a high pressure passage, the combination therewith of additional passage means positioned to place said high and low pressure passages in communication one with the other, a shaft rotatably mounted in said housing, a rotary valve member rotatable with said shaft and having a portion rotatable into position to close said additional passage, and positioning means associated with said housing in said shaft for preventing linear movement of said shaft and rotary member while permitting rotation thereof.

18. In combination in a pump, a main housing member, said housing member being shaped to define a pumping chamber, a low and a high pressure passage communicating with said pump chamber, said pump housing being shaped to provide a communication between said high and said low pressure passages, a rotary valve member positioned for rotation in said housing to control said communication, a shaft for said rotary valve member, positioning means for preventing linear movement of said shaft and valve member during said rotation, closure means for closing said housing member, a pair of meshing gears positioned in said pump chamber, and shafts supporting said gears, said shafts extending through and outwardly beyond the outer face of a closure means.

19. In combination in a pump, a main housing member, said housing member shaped to define a pumping chamber, a low and a high pressure passage communicating with said pump chamber, said pump housing being shaped to provide a communication between said high and said low pressure passages, said communication including a plurality of openings, a rotary valve member mounted in said housing for rotational, nonlinear movement therein, to control said openings, a shaft for said rotary valve member, closure means for closing said housing member, a pair of meshing gears positioned in said pump chamber, a shaft supporting each of said gears, each of said shafts extending through said closure means, and means adapted to hold said rotary valve member in contact with the member in which said openings are formed.

20. In combination, a housing for pumps and the like, said housing being shaped to provide an inlet and an outlet passage, 2. bt -pass positioned to bypass fiuid between said passages, said bypass including a fixed ported member having a face portion surrounding the port therein, a rotary shaft in said housing, a valve member having a face conforming to said face of said ported member and carried by said shaft in con- References Cited: in the file of this patent UNITED STATES PATENTS Name Date Fellows et al. June '7, 1938 Number Number 16 Name Date Tweddell July 12, 1938 Petersen Oct. 4, 1938 Kleeknei' Sept. 23, 1941 Vertson Aug. 4, 1942 Herman Feb. 2, 1943 Gray Dec. 2, 1947 Mefierd Jan. 6, 1948 Lapsley Jan. 6, 1948 Schmiel Dec. 21, 1948 Murphy Sept. 2'7, 1949