US3561476A

US3561476A - Valve

Info

Publication number: US3561476A
Application number: US768381A
Authority: US
Inventors: Harold Mandroian; Chandler A Phillips; William D Wilkerson
Original assignee: Bertea Corp
Current assignee: Parker Hannifin Corp
Priority date: 1968-10-17
Filing date: 1968-10-17
Publication date: 1971-02-09
Anticipated expiration: 1988-02-09

Abstract

This disclosure describes a valve including a movable jet pipe, a receiver and a pressure responsive member. Fluid is supplied to the discharge end of the jet pipe and through first and second passages in the receiver to the fluid pressure responsive member. The receiver provides first and second outlet passages connected to the first and second passages, respectively, for returning fluid from the pressure responsive member.

Description

United States Patent Inventors Harold Mandroian;

Chandler A. Phillips, La Canada; William D. Wilkerson, Santa Ana, Calif. Appl. No. 768,381 Filed Oct. 17, 1968 Patented Feb. 9, 1971 Assignee Bertea Corporation Irvine, Calif. a corporation of California VALVE 18 Claims, 6 Drawing Figs.

U.S. Cl 137/608, 137/815 Int. Cl F1611 l/00 Field of Search 137/608, 596.12, 596, 81.5; 91/3 References Cited UN lTED STATES PATENTS 2,247,301 6/1941 Lesser 91/3 2,298,267 10/1942 Alderman et: a1. 137/596.12X 2,904,057 9/1959 Callender et a1 9l/3X 3,199,535 8/1965 Baer 137/596 3,225,780 12/1965 Warren et a1, 137/815 3,396,631 8/1968 Woodward 91/3 3,410,291 11/1968 Boothe et al.. 137/596X 3,448,481 6/1969 Jones, Jr.... 91/3X 3,468,220 9/1969 Lazar 91/3 Primary Examiner-Samuel Scott Attorney-Smyth, Roston & Pavitt ABSTRACT: This disclosure describes a valve including a movable jet pipe, a receiver and a pressure responsive member. Fluid is supplied to the discharge end of the jet pipe and through first and second passages in the receiver to the fluid pressure responsive member. The receiver provides first and second outlet passages connected to the first and second passages, respectively, for returning fluid from the pressure responsive member.

PATENTEUFEB SIS?! 35 475 snm 2 OF 2 VALVE BACKGROUND OF THE INVENTION Jet pipe control valves typically include a movable jet pipe in communication with fluid under pressure, a receiver, and an actuating device or fluid pressure responsive member such as a fluid motor or piston-type actuator. The receiver typically defines .two receiver passages which may be connected, respectively, to opposite sides of the fluid responsive member. In operation the jet pipe is moved to supply fluid to one or both of the receiver passages whereupon the receiver causes appropriate quantities of fluid to be conducted to the fluid pressure responsive member to cause the desired movement.

Several general operational conditions of the jet pipe control valve are possible. In the full flow to load condition, all of the fluid under pressure is supplied to the pressure responsive member through one passage of the receiver and all of the fluid returns through the other passage of the receiver. In a part flow to load condition, a portion of the supply fluid is supplied to the pressure responsive member through one receiver passage and the balance or excess of the supply fluid is directed toward the second receiver passage. All return flow occurs through the second receiver passage and impinges against the fluid being supplied to such passage. In the blocked condition, no fluid enters either of the receiver passages and all of the fluid bypasses the receiver or flows out from underneath the nozzle to return. Thus, with prior art valves of this type, the same two passages in the receiver serve as both discharge end of the jet pipe and the receiver rather than on tering the receiver causes a force to be applied to the jet pipe. This is undesirable inthat it may cause movement of the jet pipe and/or the receiver thereby producing an error in the proportioning of the fluid to the two passages of the receiver. Furthermore, when the return fluid impinges against the excess supply fluid, significant forces are applied to the 'jet pipe. This may cause movement or instability of the jet pipe.

It is desirable to size the inlet and outlet of the two receiver passages to obtain optimum flow characteristics. Thus, in sizing the receiver passages for use as supply passages, the end portions thereof adjacent the jet pipe should be sized as inlets and-have a relatively small cross-sectional area. However, in sizing the same passages for use as returns, the end portions thereof adjacent the jet pipe should be sized for an outlet and have a relatively large cross-sectional area which gradually enlarges as it extends toward the jet pipe. Thus, the sizing of these passages must be a compromise and optimum flow conditions are not approached. I

SUMMARY OF THE INVENTION The present invention prevents the return fluid from causing control valve error and instability by providing separate outlet passages in the receiver for the return fluid. The outlet passages conduct the return fluid to locations which are spaced sufficiently from the jet pipe so that fluid discharged from the outlet passages do not materially affect jet pipe position or stability. In addition, the outlet passages conduct at least the greater portion of the excess supply fluid to return to thereby substantially reduce bypassing of the supply fluid beneath the jet pipe.

A receiver constructed in accordance with the teachings of the present invention may include a body having first and second receiver passages extending there through. Each of the first and second receiver passages have an inlet section adjacent the discharge end of the jet pipe for receiving fluid under pressure from the jet pipe and an outlet section for supplying fluid under pressure or velocity to the fluid pressure responsive member. As a practical matter the pressure of the fluid received by the inlet section from the jet pipe will be substantially entirely velocity head. Each of the receiver passages have an intermediate region or intermediate section lying intermediate the inlet section and outlet section.

The body also defines first and second outlet passages which extend, respectively, from the intermediate sections of the first and second receiver passages to locations on the outer surface of the body. Fluid returning from the pressure responsive member returns through the outlet section, the intermediate section and the outlet passage.

To assure that fluid discharged from the outlet passage does not impinge against the jet pipe, each of the outlet passages should conduct the return fluid along a path to avoid interference with the jet pipe. Preferably, the outlet passages terminate at locations on the outer surface of the body which are spaced from the inlet sections and which are spaced sufficiently from the normal positions of the jet pipe so as to avoid interference therewith. By preventing the return fluid from impinging against the jet pipe, control valve error and instability can be eliminated.

It is important to. assure that return flow enters the outlet passage rather than the inlet section and with the present invention, several factors contribute to thisresult. First, the intermediate section should be positioned relative to the outlet passage and the inlet section so that return fluid is substantially entirely caused to flow through the outlet passage rather than through the inlet section. Preferably, the intermediate section forms a nozzle for directing the return fluid into the outlet passage. Preferably the nozzle includes a substantially straight region adjacent the outlet passage for directing return fluid into the outlet passage. The receiver has a first surface which defines one side of the outlet, intermediate and inlet sections, a second surface which defines the opposite side of the inlet section and a third surface which defines one side of the outlet passage. The second and third surfaces intersect at a preselected zone of intersection which lies approximately on a line drawn tangent to the first surface at the intermediate section.

Secondly, the present invention also teaches that it is desirable to maintain the cross-sectional area of the intermediate section at a minimum to thereby increase the velocity and decrease the static pressure of the return fluid. This further assures that the return fluid will not-flow into the inlet section.

To further assure that the return fluid will flow through the outlet passage rather than into the inlet section, the outlet passage can be constructed to afford a lesser resistance to reverse fluid flow than the inlet passage. To this end, the length of the outlet passage may be less than the length of the inlet section and the cross-sectional area of a major portion of the outlet passage is preferably greater than the cross-sectional area of the inlet passage. In addition, the fluid adjacent of the inlet section is at supply pressure and the fluid adjacent the outlet of the outlet passage is at a relatively low return pressure. Thus, there is a greater tendency for the fluid to exit through the outlet passage.

Another advantage of the present invention is that the inlet section can be sized for use solely as an inlet whereas heretofore, the cross-sectional area of the inlet section was a compromise between the desired inlet and outlet sizes. Accordingly, the inlet section of the present invention preferably has a relatively small cross-sectional area to maintain high velocity and low static pressure of the supply fluid. Such conditions are maintained through the intermediate section to the outlet section at which the cross-sectional area increases to recover static pressure and to lower the velocity of the supply fluid.

The concepts of this invention are also applicable to receivers having only a single receiver passage. For example, it is sometimes necessary to supply fluid under pressure to only a single side of an actuator where the opposite side of the piston has a substantially constant pressure acting against it. In this instance only a single receiver passage is required.

To facilitate production, the concepts of the present invention can advantageously be embodied in a receiver including first and second body sections and a divider sandwiched between the body sections. The surfaces of each of the body sections confronting the divider have groove means therein. Each of the groove means cooperate with the divider to define a receiver passage and an outlet passage substantially as described hereinabove. The divider is preferably in the form of a thin platelike element and forms a partition between the confronting surfaces of the body section. With this construction the two inlet sections are preferably located closely adjacent each other and the outlet passages terminate at locations spaced circumferentially from .the associated inlet sections.

The invention, both as to its organization, and method of operation together with further features and advantages thereof may best be understood by reference to the following description taken in connection with the accompanying illustrative drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a partially schematic front elevational view of a valve constructed in accordance with the teachings of this invention.

FIG. 2 is an end elevational view, partially in section of the receiver taken generally along line 2-2 of FIG. 1.

FIG. 3 is an end elevational view taken along line 3-3 of FIG. 1 and illustrating an end face of one of the body sections.

FIG. 3A is a view similar to FIG. 3' with the corresponding receiver passage and outlet passage of the other body section shown in dashed lines.

FIG. 4 is an enlarged fragmentary sectional view taken along line 4-4 of FIG. 3 and illustrating the cross-sectional shape of the inlet section and one of the receiver passages.

FIG. 5 is a fragmentary sectional view taken along line 5-5 of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings and in particular to FIG. 1 thereof reference numeral 11 designates a valve constructed in accordance with the teachings of this invention. Generally, the valve 11 includes a jet pipe 13, a receiver 15, and an actuating device 17 which is shown schematically in FIG. 1. The jet pipe 13 includes a tube 19 having a passage 21 extending therethrough and terminating at one end in a reduced crosssectional area nozzle 23. In the embodiment illustrated, the jet pipe P3 is mounted on a fixed mounting member 25 for pivotal movement about an axis 26 relative to the receiver 15. Although it is necessary that the jet pipe 13 and the receiver 15 be relatively movable, any other suitable means for accomplishing such relative movement may be utilized, if desired. For example, the jet pipe 13 and receiver 15 experience linear relative movement.

The actuating device 17 may be any fluid pressure responsive device such as an actuator, fluid motor, etc. By way of example, the actuating device may include a cylinder 27 having a fluid pressure responsive member or piston 29 slidably mounted therein. The piston 29 may be connected by a rod 30 to an external member (not shown) to perform some useful function such as control function. The

conduits

31 and 33 connect the opposite ends of the cylinder 27 to the receiver 17. By supplying fluid under pressure through, for example, the conduit 31 while allowing fluid to return through the conduit 33, the piston 29 can be moved to the right as shown in FIG. 1.

The receiver 15 supplies fluid under pressure from the jet pipe 13 to the actuating device 17 and also returns fluid from the actuating device 17 to a suitable return system. The jet pipe 13 and the receiver 15 can be suitably mounted in any suitable manner within a case 34 shown schematically in FIG. 1. The

conduits

31 and 33 project through the case 34 and the conduits and case are appropriately sealed to prevent leakage into the case. The jet pipe 13 is spaced from the receiver very slightly (the spacing shown in FIG. 1 being exaggerated) so that the fluid under pressure supplied by the jet pipe can traverse this gap. The jet pipe 13 supplies fluid under pressure, which is substantially all velocity head, to the receiver through a thin layer of fluid intermediate the jet pipe and the receiver.

A suitable conduit 34b provides a connection between the case 34 and a suitable sump (not shown).

and 37 and a divider 39 sandwiched between the body sections. The

body sections

35 and 37 have substantially planar end faces 41 and 43, respectively, in which groove means 45 and 47 (FIG. 3A) are formed. The

body sections

35 and 37 are suitably interconnected with the end faces 41 and 43 in confronting relationship, and with the divider tightly clamped between the end faces. The divider 39 is in the form of a thin disc or partition. The groove means 45 and 47 cooperate with the divider 39 to deflnereceiver

passages

49 and 51, (FIG. 3A) respectively.

The

passages

49 and 51 are preferably mirror images of each other when viewed from the same side and are preferably arranged as shown in FIG. 3A. With reference to FIG. 3, the receiver passage 49 includes an inlet section 53, an outlet section 55 and an intermediate section 57. The inlet section 53 terminates at the outer surface of the body section 35 in an inlet 59 and the outlet section 55 terminates at the outer sur face of the outlet sections 55 in an outlet 61.

The

grooves

45 and 47 also cooperate with the divider 39 to define

outlet passages

63 and 65, (FIG. 3A) respectively. As best seen in FIG. 3, the outlet passage 63 extends from the intermediate section 57 generally radially outwardly and terminates in an outlet 67 in the outer surface of the-body section 35. The cross-sectional area of the outlet passage 63 progressively increases as it extends toward the periphery of the body section. The cross-sectional area of a major portion of the length of the outlet passage 63 is greater than the cross-sectional area of the inlet section 53.

The body section 35 has a relatively large groove 69 projecting radially inwardly and extending'axially therealong. In the embodiment illustrated, the outlet 67 opens into the groove 69 so that fluid returning through the outlet passage 63 enters the groove 69. The groove 69 which does not extend into the divider 39 shortens the outlet passage 63 so that the latter is of lesser length than the inlet section 53. As the length and cross-sectional area of the outlet passage 63 are less than that of the inlet section 53, the outlet passage 63 provides a lesser resistance to fluid flow than does the inlet section.

The inlet section 53 is preferably of relatively small crosssectional area to maintain fluid flowing therein at high velocity and low static pressure. In the embodiment illustrated, the inlet section 53 extends from the inlet 59 generally radially inwardly of the body section 35 and is curved slightly. The intermediate section 57 is substantially straight and is also of relatively smaller cross-sectional area to maintain high velocity and low static pressure. The outlet section 55 extends radially outwardly from the intermediate section and is curved slightly in a direction opposite to the direction of curvature of the inlet section 53. The cross-sectional area of the outlet section 55 progressively increases as it extends radially outwardly to thereby provide for a reduction in fluid velocity and an increase in static pressure. This increase in cross-sectional area of the outlet section 55 is preferably brought about by an increase of groove width as shown in FIGS. 2 and 3 and an increase of groove depth as shown in FIG. 5. A point a is located in FIGS. 3 and 5 for reference purposes.

The outlet passage 63 has the inlet end thereof substantially in alignment with the straight intermediate section 57. Thus. fluid returning from the outlet section 55 through the intermediate section 57 tends to be directed through the outlet passage 63 rather than into the inlet section 53. That is, the fluid traveling through the intermediate section 57 tends to continue moving in the same direction and therefore tends to exit through the outlet passage 63 rather than through the inlet section 63. Furthermore, because the intermediate section 57 is of relatively small cross-sectional area, the fluid flowing therethrough is at a relatively low static pressure and is traveling at high velocity. The high velocity fluid has a lesser tendency to undergo a change of direction. Because of the low static pressure, there is little pressure provided which would tend to change the direction of the fluid stream by urging it into the inlet section 53.

The

passages

49 and 51 are identical except that one is the mirror image of the other when viewed from the same side in FIG. 3A. Portions of the passage 51 corresponding to the passage 49 are designated with corresponding reference characters followed by a letter'a. The outlet passage 65a terminates in a groove 69a in the body section 37. The groove 69a is circumferentially offsetfrom the groove 69 and the 45 and 49 are preferably generally rectangular in cross section throughout the full length thereof.-

As shown in FIG. 3, the surface 75 extends from one end of the passage 49 to the other .and defines one side of the inlet section 53, the intermediate section 57 and the outlet section 55. The surface 73 extends inwardly generally parallel to the surface 75 and terminates along a line b which appears as a point in FIG. 3. Another surface 79 extends continuously along, and forms oneside of, the outlet section 55, the intermediate section 57 and the outlet passage 63. The other side of the outlet passage 63 is defined by a surface 81 which intersects the surface 73 at the line b. Thus the line b defines a zone of intersection.

Preferably the line b is intersected by a tangent line 0. The tangent line c is a line drawn tangent to the surface 75 at the intermediate region 57. Specifically, the line 0 lies along one of the straight sides of the intermediatesection 57. In the specific embodiment illustrated, the line b lies within about .001 inch of the line 0. This relationship is important in assuring that a maximum amount'of the return fluid will flow from the intermediate section 57 into the outlet passage63 rather than into the inlet section'53.

If the zone of intersection b is moved to the left of the tan gent line c, to restrict the cross-sectional area of the intermediate section 57, the return fluid would tend to enter and flow through the inlet section 53. If the zone of intersection b is moved to the right of the tangent line c, it undesirably restricts the cross-sectional area of the inlet section 53. Accordingly, it is preferred to maintain the zone of intersection b as close as possible to the tangent line 0, because to the extent that this relationship is not maintained either pinching off of the inlet section 53 or diversion of 'the return fluid into the inlet passage 53 will occur.

The

body sections

35 and 37 may be secured together in any desired manner. It is important, however, that the

passages

49 and 51 be oriented with the inlets 59 and 59a closely adjacent and preferably axially aligned. To accomplish this alignment pins 83 can be installed in axially extending grooves 85 in the

body sections

35 and 37.

As shown in FIG. 1, the jet pipe 13 is mounted with the and are separated only by the relatively thin divider 39.-The

l jet pipe 39 is connected to a source of fluid under pressure (not shown) and supplies this fluid to the inlets 59 and 59a.

The portion of fluid enteringeach of the inlets 59 and 59a depends upon the position of the jet pipe 13 relative to the inlets. The divider 39 divides the flow between the inlets 59 and 59a. The position of the jet pipe 13 relative to the receiver may be adjusted in any conventional manner.

Assuming that the jet pipe 13 is arranged to direct substantially all of the fluid into the inlet 59, such fluid flows at high velocity through the inlet section 53 and the intermediate section 57 to the outlet section 55 in which the velocity of the fluid is reduced and the static pressure is increased. The fluid is transmitted through the conduit 3ll to the cylinder'27 and acts on the left-hand end of the pist on 29 and to move the piston to the right. Such piston movement may perform any suitable function such as a control function. Movement of the piston 29 to the right expels fluid from the cylinder 27 on the right-hand side of the piston. Thus, fluid travels through the conduit 33 into the outlet section 55a of the passage 51. As the fluid travelsthrough the intermediate section 59a, the velocity is increased and the static pressure isdecreased.

The return fluid travels from the intermediate section 570 into the outlet passage 65. In the specific embodiment illustrated, numerous factors combine to assure that the return fluid returns through the outlet passage 65. Specifically, the orientation of the intermediate section 570 relative to the inlet section 59a and the outlet passage 65and the lesser resistance to fluid flow provided by the outlet passage 65 as compared to the inlet section 53a are operative to cause the return fluid to enter the outlet passage 65. In addition, the fluid pressure adjacent the inlet 59a is at supply pressure whereas the fluid adjacent the outer end of the outlet passage 65 is at return pressure. This pressure differential further assures that the fluid returns through the outlet passage 65.

The return fluid enters the groove 69a and the case 34 and may be permitted to flow to a suitable sump (not shown) via the conduit 34b. The groove 71 which extends through the

body sections

35 and 37 and the divider 39 (FIGS. 1 and 2) provides a passageway for providing communication between the

grooves

69 and 69a.

In the event that the position of the jet pipe 13 were adjusted so that less than full flow was entering the inlet 59, a substantial portion of the balance of the fluid supplied to the jet pipe would enter the inlet 59a and] travel through the inlet section 530 to the intermediate section 57a at which point it would meet the fluid returning from the cylinder 27. In this event, the fluid supplied to the inlet 590 would also exit through the outlet passage 65.

In the blocked condition, the piston 29 undergoes no movement either because equal pressures. are applied to the opposite sides thereof or because the piston is bottomed against one end of the cylinder 27. In the blocked condition, supply fluid enters both of the inlets 59 and 59a and is allowed to return through the

outlet passages

63 and 65.

Although exemplary embodiments of the invention have been shown and described, many changes, modifications and substitutions may be made by one having ordinary skill in the art without necessarily departing from the spirit and scope of this invention.

We claim: I. A receiver for a control valve of the type having movable means for supplying fluid under velocity head (through the discharge end thereof and) to the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising:

a body including first and second body sections, a platelike divider and means for interconnecting said body sections with said divider sandwiched therebetween each of said body sections having a surface confronting said divider and groove means in said surface, said groove means of said first and second body sections cooperating with said divider to define first and second receiver passages, resplectively, and first and second outlet passages, respective y;

each of said first and second receiver passages having an inlet section adjacent the movable means for receiving fluid under velocity head therefrom, an outlet section for supplying fluid under pressure to the pressure responsive member and for receiving return flow of fluid from the pressure responsive member, and an intermediate section intermediate ,said inlet section and said outlet section, said first and second receiver passages terminating at both ends in the outer surfaces of said first and second body sections, respectively; and

said first and second outlet passages extending from the intermediate sections of said first and second passages, respectively, to locations on the outer surfaces of said first and second body sections, respectively, and being spaced from said inlet sections, said outlet passages conducting return fluid from the associated intermediate section to the exterior of said body.

2. A receiver as defined in claim 1 including a groove formed in the exterior surface of said body sections for providing a path of communication on the exterior of said body between said first and second outlet passages.

3. A receiver as defined in claim 1 wherein said first body section defines a first groove in the exterior surface thereof and said first outlet passage terminates in said first groove whereby the length of said first outlet passage is reduced.

4. A receiver as defined in claim 1 wherein said outlet section of said first receiver passage terminates in an outlet at the outer surface of said first body section and the cross-sectional area of said outlet section of said first receiver passage progressively increases as it extends from the intermediate section of the first receiver passage to the outlet of said first receiver passage, said last mentioned outlet being of greater cross-sectional area than the intermediate section of the first receiver passage at the juncture of such intermediate and outlet sections.

5'. A receiver as defined in claim 1 wherein said first receiver passage is generally rectangular in transverse cross section.

6. A receiver for a control valve of the type having movable means for supplying fluid through the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising:

a body having inner surface means defining a receiver passage extending through said body, said body having an outer surface;

said receiver passage having an inlet section adjacent the movable means for receiving fluid therefrom, an outlet section for supplying fluid under pressure to the pressure responsive member and for receiving return flow of fluid from the pressure responsive member, and an intermediate section intermediate said inlet section and said outlet section, said inlet section and said outlet section terminating at said outer surface of said body in an inlet and an outlet, respectively;

said inner surface means for said body defining an outlet passage extending from said intermediate section of said receiver passage to a location on the outer surface of said body spaced from said inlet;

said inlet and intermediate sections of said receiver passage and said outlet passage being oriented so that fluid flowing from said outlet section through the intermediate section tends to flow into the outlet passage rather than into the inlet section; and

the cross-sectional area of said intermediate section of said receiver passage being smaller than the cross-sectional area of said outlet whereby the static pressure at said intermediate section is relatively low.

7. A receiver as defined in claim 6 wherein said inner surface means includes a first surface defining one side of said outlet section, said intermediate section and said inlet section(s), a second surface defining the opposite side of said inlet section and a third surface defining one side of said outlet passage, said second and third surfaces intersecting at a preselected zone, said zone and said first surface being located so that a line drawn tangent to said first surface at said intermediate section at least substantially intersects said zone.

8. A receiver as defined in claim 6 wherein the axis of said intermediate section of said receiver passage is substantially straight and said outlet passage is joined to said intermediate section of said receiver passage adjacent the end thereof which is adjacent said inlet section.

9. A receiver as defined in claim 6 wherein said outlet passage terminates at said location in an outlet, the cross-sectional area of said intermediate section of said receiver passage being less than the cross-sectional area of said last mentioned outlet.

10. A receiver as defined in claim 6 wherein said outlet section progressively increases in cross-sectional area as it extends from said intermediate section to said outlet.

11. A receiver for a control valve of the type having movable means for supplying fluid through the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising:

said inner surface means of said body defining an outlet passage extending from said intermediate section of said receiver passage to the location on the outer surface of said body spaced from said inlet;

the cross-sectional areas of said inlet section and said intermediate section are smaller than the cross-sectional area of a portion of the outletsection adjacent said outlet.

12. A receiver as defined in claim 11 wherein said outlet section progressively increases in cross-sectional area as it extends from said intermediate section to said outlet, said outlet passage terminates at said location in an outlet, the cross-sectional area of said outlet passage progressively increases as the outlet passage extends from the intermediate section to said outlet of the outlet passage.

13. A control valve comprising:

a jet pipe connectable to a supply of fluid under pressure, said jet pipe having a discharge end through which the fluid can be emitted;

a receiver having a receiver passage extending therethrough, said receiver passage having an inlet section adjacent the discharge end of the jet pipe for receiving fluid from the jet pipe, an outlet section, and an intermediate section, intermediate said inlet section and said outlet section;

means for mounting said receiver and said jet pipe for movement relative to each other with the discharge end of the jet pipe lying, closely adjacent said inlet section whereby movement of the jet pipe varies the amount of fluid directed toward the inlet section;

a pressure responsive member;

means for providing a fluid flow path between said outlet section of said receiver passage and one side of said fluid responsive member whereby fluid can be supplied to said member;

said receiver having an outlet passage therein extending from the intermediate section of said receiver passage to a location spaced from said inlet section whereby at least a portion of the fluid returning through said intermediate section of said receiver passage flows through said outlet passage; and

at least a region of said intermediate section contiguous said outlet section being of lesser cross-sectional area than a major portion of said outlet section, said outlet section diverging as it extends away from said region of the intermediate section.

14. A combination as defined in claim 13 wherein said outlet passage is shorter than said inlet section.

I 15. A combination as defined in claim 13 wherein said receiver has a second receiver ,passage extending therethrough, said second receiver passage having an inlet section adjacent the discharge end of the jet'pipe for receiving fluid from the jet pipe, an outlet section, and anintermediate section intermediate said inlet section and said outlet section, said inlet section of said second receiver passage lying closely adjacent the discharge end of the jet pipe:

means for providing a fluid flow path between the outlet section of said second receiver passage and the opposite pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising:

a body having an inner surface defining a receiver passage extending through said body, said body having an outer surface;

said receiver passage having an inlet adjacent the movable member for receiving fluid from the jet pipe and an outlet for supplying the fluid from the jet pipe and an outlet surface; for supplying the fluid to the fluid pressure responsive member, said inlet and outlet being at said outer surface;

said body defining an outlet passage extending from a region of said receiver passage intermediate said inlet and outlet thereof to a location on the outer surface spaced from said inlet and said movable member; r i

said outlet passage and said region of said receiver passage being positioned so that at least a major portion of the fluid flowing from the outlet of said receiver passage .flows through the outlet passage rather than through said inletof said receiver passage; and

said receiver passage being a divergent portion which diverges from'a location adjacent said region toward said outlet, said outlet'having no less than about the same cross-sectional area as said divergent portion of said receiver passage. I

17. A receiver as defined in claim 16 wherein said outlet passage terminates in an outlet and said outlet passage diverges from a location substantially-at said region toward said last-mentioned outlet said last-mentioned outlet having no less than about the same cross-sectional area as other portions of said outlet passage.

18. A receiver for a control valve of the type wherein fluid is directed by a movable member toward the receiver to a fluid pressure responsive member toward the receiver to a fluid pressure responsive member and wherein the fluidcan return through the receiver, said receiver'comprising:

a body having an inner surface defining a receiver passage extending through said body, said body having an outer surface; v

said receiver passage having an inlet'adjacent the movable member for receiving fluid from the jet pipe and an outlet for supplying the fluid to the fluid pressure responsive member, said inlet and outlet being at said outer surface;

said body defining an outlet passage extending from a region of said receiver passage intermediate said inlet and outlet thereof to a location on theouter surface spaced from said inlet and said movable member;

said outlet passage and said region of said receiver passage being positioned so that at least a major portion of the fluid flowing from the outlet of said receiver passage flows through the outlet passage rather than through said inlet of said receiver passage: and

said outlet passage terminating inan outlet, said outlet passage diverging from said region to said outlet thereof.

Claims

1. A receiver for a control valve of the type having movable means for supplying fluid under velocity head (through the discharge end thereof and) to the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising: a body including first and second body sections, a platelike divider and means for interconnecting said body sections with said divider sandwiched therebetween each of said body sections having a surface confronting said divider and groove means in said surface, said groove means of said first and second body sections cooperating with said divider to define first and second receiver passages, respectively, and first and second outlet passages, respectively; each of said first and second receiver passages having an inlet section adjacent the movable means for receiving fluid under velocity head therefrom, an outlet section for supplying fluid under pressure to the pressure responsive member and for receiving return flow of fluid from the pressure responsive member, and an intermediate section intermediate said inlet section and said outlet section, said first and second receiver passages terminating at both ends in the outer surfaces of said first and second body sections, respectively; and said first and second outlet passages extending from the intermediate sections of said first and second passages, respectively, to locations on the outer surfaces of said first and second body sections, respectively, and being spaced from said inlet sections, said outlet passages conducting return fluid from the associated intermediate section to the exterior of said body.

5. A receiver as defined in claim 1 wherein said first receiver passage is generally rectangular in transverse cross section.

6. A receiver for a control valve of the type having movable means for supplying fluid through the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising: a body having inner surface means defining a receiver passage extending through said body, said body having an outer surface; said receiver passage having an inlet section adjacent the movable means for receiving fluid therefrom, an outlet section for supplying fluid under pressure to the pressure responsive member and for receiving return flow of fluid from the pressure responsive member, and an intermediate section intermediate said inlet section and said outlet section, said inlet section and said outlet section terminating at said outer surface of said body in an inlet and an outlet, respectively; said inner surface means for said body defining an outlet passage extending from said intermediate section of said receiver passage to a location on the outer surface of said body spaced from said inlet; said inlet and intermediate sections of said receiver passage and said outlet passage being oriented so that fluid flowing from said outlet section through the intermediate section tends to flow into the outlet passage rather than into the inlet section; and the cross-sectional area of said intermediate section of said receiver passage being smaller than the cross-sectional area of said outlet whereby the static pressure at said intermediate section is relatively low.

11. A receiver for a control valve of the type having movable means for supplying fluid through the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising: a body having inner surface means defining a receiver passage extending through said body, said body having an outer surface; said receiver passage having an inlet section adjacent the movable means for receiving fluid therefrom, an outlet section for supplying fluid under pressure to the pressure responsive member and for receiving return flow of fluid from the pressure responsive member, and an intermediate section intermediate said inlet section and said outlet section, said inlet section and said outlet section terminating at said outer surface of said body in an inlet and an outlet, respectively; said inner surface means of said bodY defining an outlet passage extending from said intermediate section of said receiver passage to the location on the outer surface of said body spaced from said inlet; said inlet and intermediate sections of said receiver passage and said outlet passage being oriented so that fluid flowing from said outlet section through the intermediate section tends to flow into the outlet passage rather than into the inlet section; and the cross-sectional areas of said inlet section and said intermediate section are smaller than the cross-sectional area of a portion of the outlet section adjacent said outlet.

13. A control valve comprising: a jet pipe connectable to a supply of fluid under pressure, said jet pipe having a discharge end through which the fluid can be emitted; a receiver having a receiver passage extending therethrough, said receiver passage having an inlet section adjacent the discharge end of the jet pipe for receiving fluid from the jet pipe, an outlet section, and an intermediate section, intermediate said inlet section and said outlet section; means for mounting said receiver and said jet pipe for movement relative to each other with the discharge end of the jet pipe lying closely adjacent said inlet section whereby movement of the jet pipe varies the amount of fluid directed toward the inlet section; a pressure responsive member; means for providing a fluid flow path between said outlet section of said receiver passage and one side of said fluid responsive member whereby fluid can be supplied to said member; said receiver having an outlet passage therein extending from the intermediate section of said receiver passage to a location spaced from said inlet section whereby at least a portion of the fluid returning through said intermediate section of said receiver passage flows through said outlet passage; and at least a region of said intermediate section contiguous said outlet section being of lesser cross-sectional area than a major portion of said outlet section, said outlet section diverging as it extends away from said region of the intermediate section.

15. A combination as defined in claim 13 wherein said receiver has a second receiver passage extending therethrough, said second receiver passage having an inlet section adjacent the discharge end of the jet pipe for receiving fluid from the jet pipe, an outlet section, and an intermediate section intermediate said inlet section and said outlet section, said inlet section of said second receiver passage lying closely adjacent the discharge end of the jet pipe: means for providing a fluid flow path between the outlet section of said second receiver passage and the opposite side of said fluid responsive member; and said receiver having a second outlet passage therein extending from the intermediate section of said second receiver passage to a location spaced from the inlet section of said second receiver passage whereby at least a portion of the fluid returning through the intermediate section of said second receiver passage flows through said last-mentioned outlet passage.

16. A receiver for a control valve of the type wherein fluid is directed by a movable member toward the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising: a body having an inner surface defining a receiver passage extending through said body, said body having an outer surface; said receiver passage having an inlet adjacent the movable member for receiving fluid from the jet pipe and an outlet for supplying the fluid from the jet pipe and an outlet surface; for supplying the fluid to the fluid pressure responsive member, said inlet and outlet being at said outer surface; said body defining an outlet passage extending from a region of said receiver passage intermediate said inlet and outlet thereof to a location on the outer surface spaced from said inlet and said movable member; said outlet passage and said region of said receiver passage being positioned so that at least a major portion of the fluid flowing from the outlet of said receiver passage flows through the outlet passage rather than through said inlet of said receiver passage; and said receiver passage being a divergent portion which diverges from a location adjacent said region toward said outlet, said outlet having no less than about the same cross-sectional area as said divergent portion of said receiver passage.

17. A receiver as defined in claim 16 wherein said outlet passage terminates in an outlet and said outlet passage diverges from a location substantially at said region toward said last-mentioned outlet, said last-mentioned outlet having no less than about the same cross-sectional area as other portions of said outlet passage.

18. A receiver for a control valve of the type wherein fluid is directed by a movable member toward the receiver to a fluid pressure responsive member toward the receiver to a fluid pressure responsive member and wherein the fluid can return through the receiver, said receiver comprising: a body having an inner surface defining a receiver passage extending through said body, said body having an outer surface; said receiver passage having an inlet adjacent the movable member for receiving fluid from the jet pipe and an outlet for supplying the fluid to the fluid pressure responsive member, said inlet and outlet being at said outer surface; said body defining an outlet passage extending from a region of said receiver passage intermediate said inlet and outlet thereof to a location on the outer surface spaced from said inlet and said movable member; said outlet passage and said region of said receiver passage being positioned so that at least a major portion of the fluid flowing from the outlet of said receiver passage flows through the outlet passage rather than through said inlet of said receiver passage; and said outlet passage terminating in an outlet, said outlet passage diverging from said region to said outlet thereof.