JPH0139482B2 - - Google Patents

Description

Claim 1: A pressure regulating valve 10 for use with a pilot operated directional control valve 11 and a compensation valve 84 having a discharge hole 91, comprising a first inlet 39, a second inlet 99, an outlet 34,
and discharge passages 101, 63, which communicate with them.
64, a first inlet 39 connected to a fluid source, a second inlet 99 connected to a discharge hole 91, and an outlet 34 connected to a pilot-operated directional control valve 11; , a hole 33 movably positioned in the valve chamber 25 and in continuous communication with the outlet 34, a radial port 61 communicating with the hole 33, and a second inlet 9.
a valve member 26 having an annular recess 98 communicating with the valve member 9; a connector 4 slidably connected to the valve member 26;
2. a spring 47 positioned between the connector 42 and the valve member 26; and a spring 47 engaged with the connector 42 and selectively movable to initially cause the valve member a manual input element 28 for resiliently moving the radial port 61 to a fluid regulation position, in which the first inlet 39 is connected to the radial port 61;
and said manual input element 2 communicating with said valve chamber 25 at one end of said valve member through said hole 33 and for causing fluid pressure at said outlet 34 to be adjusted as a function of movement of said input element 28.
8, wherein the input element 28 is spaced from the valve member 26 in the fluid regulating position of the valve member 26 and subsequently engages an end of the valve member 26 upon further movement of the input element 28; The second inlet 99 and the discharge hole 91 are connected to the discharge passage 10 through the annular recess 98 in the valve member 26.
1, 63 and 64. A pressure regulating valve having a discharge function, comprising: actively moving the valve member to a discharge position communicating with the valve member 1, 63, and 64.

2. The second inlet 99 is cut off from fluid communication with the discharge passageway 101 in the fluid regulating position of the valve member 26.
A pressure regulating valve with a discharge function as described in 2.

TECHNICAL FIELD The present invention relates to pressure regulating valves and, in particular, to pressure regulating valves for use in fluid systems requiring the discharge of pressure oil from system components.

Background technology L. Field II U.S. Patent No.
No. 3,840,049, which patent is owned by the assignee of the same, discloses a method for preferentially positioning the internal piston to the opposite end of the piston cylinder.
A control system used to control the positioning of the fluid motor is shown including a directional control valve actuated by a pilot valve to selectively supply pressurized fluid. The directional control valve is adapted to automatically open a bypass passage between the fluid motor port and the fluid return passage when required to prevent cavitation of the motor such as would result from an overrun condition due to external load forces. Contains a valve.
The pilot valve is coupled to a float valve having a spool that is displaced by fluid pressure against spring bias pressure during steady-state operation of the system. When desired, the manual pilot valve is moved to the float position.

Joseph Deistler U.S. Patent No. 3766944
A pilot-controlled fluid flow regulating valve is shown in this issue. The regulating valve is moved relative to the neutral position by fluid from the pilot valve. The regulating valve includes a manual handle for controlling the positioning of a piston mounted within the valve body of the pilot valve.

Other background patents related to pressure regulating valves include Franz Foster et al.
No. 3698415; Egon Zuantzer's U.S. Patent No.
No. 3,817,153; U.S. Pat. No. 3,987,703 to Eugene E. Latimer, which is owned by its assignee; and British Patent No. 1,494,400 to Nordei Hydraulics AB, a Swedish corporation. The Zunzur patent shows a pressure reducing pilot valve used in other fluid control applications. The Foster et al. patent discloses a pressure regulating valve in which a control member abuts a valve body via a plurality of springs, and at least one of the springs displaces the control member over a predetermined range. It shows something that only works. The Foster et al. patent shows a regulating pilot valve that is similarly used in a different family of applications.

In the Latimer patent, a pilot-controlled hydraulic system has a load-bearing cylinder with a valving system that operates to automatically provide an emergency pilot pressure source in the event of a failure of the main pilot system. The control means utilized pressurized fluid from the load support motor to pilot the system for emergency reduction of the load.

In the British patent, a regulating pilot valve provides an output under certain conditions to force the other valve into either of two different extreme positions.

The background patents discussed above describe different types of pressure regulating valves for use in load-lifting fluid systems, but their construction is relatively expensive and complex; It does not provide an improved or simplified version of the invention.

DISCLOSURE OF THE INVENTION The present invention is directed to solving one or more of the aforementioned problems and is intended for use in fluid systems requiring both pressure regulation and pressure oil drainage of components in the fluid system. The object of the present invention is to provide a pressure regulating valve having a discharge function.

In one aspect of the invention, the invention includes an improved control means that provides pressure oil drainage as a result of a novel configuration of the pressure regulating pilot valve.

In the present invention, the draining action of the pressure oil is produced by a direct mechanical connection between the connection from the handle and the spool of the pilot valve.

Under normal conditions, the pilot valve spool is
It is biased by a spring to provide the desired pressure regulation effect. However, the valve is configured such that under conditions where it is desired to drain the pressure oil of the control valve of the system, the biasing spring allows for the desired direct connection between the control handle and the spool valve; The operator can actively move the spool valve to the device where the desired pressure oil is to be discharged.

In the illustrated embodiment, the spool valve is provided with an annular groove aligned with the tank opening which is normally closed by a portion of the spool valve during its pressure regulating action. The connection between the annular recess and the tank opening provides communication with other parts of the system to produce the desired pressure oil drainage action.

In the illustrated embodiment, draining the system compensation valve can float the load supported by the fluid motor.

More specifically, the pressure regulating valve with a discharge function according to the present invention includes a pilot operated directional control valve 11 and a compensation valve 84 having a discharge hole 91.
A pressure regulating valve 10 for use with a pressure regulating valve 10 having a first inlet, a second inlet, an outlet, and a discharge passage communicating therewith, the first inlet 39 being connected to a fluid source and the second inlet 39 being connected to a fluid source. 99 is connected to the discharge hole 91 and the outlet 34 is connected to the pilot-operated directional control valve 11; a hole movably positioned in the valve chamber and in continuous communication with the outlet; a valve member having a radial port communicating with the bore and an annular recess communicating with the second inlet; a connector slidably connected to the valve member; a connector positioned between the connector and the valve member; a spring; and a manual input element engaged with the connector and selectively movable to initially cause the spring to resiliently move the valve member to a fluid regulating position; In the adjustment position, the first inlet communicates with the valve chamber at one end of the valve member through the radial port and the bore, and the fluid pressure at the outlet is adjusted as a function of movement of the input element. said manual input element for causing said input element to be spaced apart from said valve member in a fluid regulating position of said valve member and for subsequent movement of said input element to an end of said valve member. engaging and actively moving said valve member to an evacuation position in which said second inlet and evacuation hole 91 communicates with said evacuation passage through said annular recess in said valve member.

The improved valve includes a fluid system having a reciprocating fluid motor and a fluid supply device including a directional control valve for controlling the supply of pressurized fluid to the motor to reciprocate the motor. Advantageously adapted for use in.

In the illustrated embodiment, the pressure regulating valve is a recessed device associated with first and second passage devices located in the wall device and a movable valve member, the valve member being a second preselected member. when the first and second
and a passage device that communicates between the passage devices.

In the illustrated embodiment, the transfer passage device is defined by an annular recess in the movable valve member.

As described above, the pressure regulating valve and system device of the present invention has an extremely simple structure because the pressure regulation to the fluid motor and the pressure oil discharge function can be achieved by continuous operation of the manual input element. As mentioned above, it is not only simple and economical, but also easy to operate and advantageous in use, since floating control in the reciprocating fluid motor is obtained by the above-mentioned pressure oil discharge function. It offers many advantages.

[Brief explanation of drawings]

FIG. 1A is a part of a fluid system having a pressure regulating valve embodying the present invention; FIG. 1B is a part continuing from the part shown in FIG. be.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the invention disclosed in the drawings, a pressure regulating valve, designated generally by 10, is used to supply a fluid motor 12 having a piston 13 reciprocating within a cylinder 14. It is provided for use in conjunction with a directional control valve 11 to control the flow. Pressurized fluid is supplied to the cylinder 14 through a first supply pipe 15 and a second supply pipe 16, as shown in FIG. 1B.
is fed to opposite sides of the It will be appreciated that the fluid motor 12 is shown by way of example only, and that other types of fluid motors, as well as a plurality thereof, may be used interchangeably with the disclosed motor.

Pressurized fluid for operating the fluid motor is normally supplied from a high pressure pump 17, which includes a suitable safety valve coupled between a high pressure outlet conduit 19 therefrom and a tank reservoir 20. The output pressure is regulated by 18 to control the fluid pressure within the system.

The directional control valve 11 is actuated by a pressure regulating valve which effectively defines a pilot valve. The pilot valve is controlled by a hand operated handle 21. As seen in FIG. 1A, the handle therefore presses the first actuating arm 27 against the pilot valve plunger 28 and pushes the second actuating arm 2.
9 can be rotated about the pivot 22 to push the valve against the plunger 30 of the pilot valve. The handle can be pivoted within a housing 23 carried by a wall device 24 defining the valve body.

The valve body 24 has a first valve chamber 25 housing a first movable valve member or spool 26 and a second valve chamber 3 housing a second movable valve member or spool 32.
Define 1.

The spool 26 has a downwardly open axial bore 33 which communicates with a discharge port 34 connected to a transfer conduit 35 . Spool 32 is connected to discharge port 3 to transfer conduit 38.
7 and defines an axial hole 36 similar to that described above.

Valve body 24 further defines a transverse hole constituting a suction passage 39 connected to pump 17 through supply conduit 40 .

As shown in FIG. 1A, spool 26 is provided with a shaft 41 that extends upwardly through connector 42 and into recess 43 at the lower end of plunger 28. As shown in FIG. Similarly, spool 32 is provided with an upwardly extending shaft 44 .
extends through connector 45 into a recess 46 in the lower end of plunger 30. First coil spring 47
between the connector 42 and a shoulder 48 on the spool 26 to resiliently bias the spool downwardly relative to the connector, thereby spacing the upper end of the shaft 41 from the inner wall surface 49 of the recess 43. It extends to make it.
Similarly, a coil spring 50 extends between the connector 45 and a shoulder 51 on the spool 32 to bias the spool downwardly and space the upper end of the shaft 44 from the inner wall surface 52 of the recess 46. There is.

The connector 42 is biased upwardly by a coil spring 53 extending between it and a shoulder 54 on the valve body. Similarly, the second coil spring 55 presses the connector 45 upward;
5 and a shoulder 56 on the valve body. Thus, the connector 42 is normally pressed against the shoulder 57 of the plug 58 which slidably carries the plunger 28, and the connector 45 is pressed against the shoulder 59 of the plug 60 which slidably carries the plunger 30. is being pressed against.

The spool 26 is provided with a radial port 61 open to the axial passage 33;
Spool 32 is provided with a radial port 62 open to passage 36 . As shown in FIG. 1A, ports 61 and 62 are normally separated from suction passage 39. However, when plunger 28 or plunger 30 is pressed down, preferably by manual operation of handle 21, the corresponding coupling 42 or 45 is moved downwardly against the action of spring 53 or spring 55, respectively, and This allows the spool 26 or 32 to be elastically moved downwardly by the action of a spring 47 or 50, respectively. Thus, for example, when the handle 21 is rotated to the left to push down the plunger 28, as seen in FIG.
9 and the radial port 61, thereby directing pressurized fluid from the pump and supply conduit 40 to the passageway 33 of the spool 26, the discharge port 34, and the radial port 61. It leads to the directional control valve 11 through a transfer conduit 35 . Spool 2
The pressure of the fluid in the discharge port 34 acting on the end of the spool 26 against the biased pressure of the spring 47 causes the spool 26 to move to the first position in response to the fluid pressure in the discharge port 34.
at a preselected position. Handle 21
The instantaneous preselected pressure level at the discharge port 34, determined by the magnitude of the input through the pump, remains constant. This is because any change in pressure at the discharge port 34 creates an imbalance of forces acting against the spring 47, thereby opening the port 61.
This is because it causes the movement of the spool 26 to close or close. This maintains a force balance between the spring 47 and the force created by the fluid pressure at the discharge port 34 acting on the end of the spool 26.
This action produces a pressure regulating function of the valve 10.
A similar effect occurs on port 62 of spool 32 as a result of positioning handle 21 in a clockwise direction as viewed in FIG. 1A;
Thereby providing pressure regulated fluid through transfer conduit 38.

Further, as shown in FIG. 1A, the valve body 2
4 is a discharge passageway 63 connected to the tank reservoir 20 through a discharge port 64 and a conduit 65;
further define. In the retracted position of spools 26 and 32, ports 61 and 62 communicate with the drain passages, so conduits 35, 38 are normally drained when handle 21 is in the neutral centered position of FIG. 1A. .

Referring now specifically to FIG. 1B, the directional control valve 11 constitutes a spool valve having a valve body 66 defining a valve chamber 67 within which a spool 68 is reciprocatably mounted. Conduit 35 passes through sealing member 69 and opens at one end of chamber 67, and conduit 38 passes through sealing member 70 and opens at the opposite end of the chamber.

The spool 68 has a first eccentric spring 71 extending between one end thereof and a sealing member 69 and a second eccentric spring 72 extending between the sealing member 70 and the opposite end of the spool. It is centrally located within the valve chamber 67. The high-pressure supply pipe 19 is connected through the valve body 66 to an annular recess 73 in the center of the chamber 67 . A second annular recess 74 is axially spaced from the annular recess 73 in the direction of the sealing member 69 and a third annular recess 75 is axially spaced from said recess 73 in the opposite direction. ing. Recess 74 is connected to fluid supply tube 15 through passage 76 , and recess 75 is connected to fluid supply tube 16 through passage 77 .

Outside the annular recess 74, the valve body is provided with an annular discharge recess 78, and outside the recess 75, the valve body is provided with a second annular discharge recess 79. The discharge recess is connected to the tank reservoir 20 through a discharge passage 80 and a discharge conduit 81.

The spool 68 is a first annular radially outwardly open recess 82 that communicates with the recess 74 when the control valve 11 is centered, as shown in FIG. 1B, and A portion separated from the recess 73 is provided. The spool has a second annular radially outwardly open recess 83 in communication with recess 75 and out of communication with recess 73 when it is in the centered position of FIG. 1B. It is provided.

The directional control valve 11 further includes a pair of compensation valves 84 and 8.
5 respectively. The compensation valve 84 is connected to the valve body 66
defined by a movable valve member 86 housed within a valve chamber 87 within the recess 7;
The valve seat 89 is biased into a seated relationship by a spring 88 against the open valve seat 89 . Valve member 86 defines an axial passageway 90 that communicates with a port 91 in the valve body connected to conduit 92 . Additionally, the valve member has a port 93 that opens to a valve chamber 94 that communicates with the passageway 76.
Define.

Compensation valve 85 is generally similar to compensation valve 84 except that port 91 and conduit 92 are omitted. The compensating valve 85 therefore has a valve member 95 biased against the valve seat 97 by a spring 96 .

During normal operation of the fluid system, pressurized fluid is supplied to motor 12 by selectively supplying pressurized fluid through pilot valve 10 and either control conduit 35 or 38 to the spool of directional control valve 11. 68 suitable movements. Therefore, if it is desired to move the fluid piston 13 of the fluid motor 12 to the right as viewed in FIG. 1B, the preferred manual operation of the pilot valve handle 21 as shown in FIG. 1A is , supplies pressurized fluid to the transfer conduit 35 through the spool passage 33, thereby supplying pressure to the left end of the spool 68 of the directional control valve 11 and to the recess 8.
2 to the right to create communication between recesses 73 and 74, thereby providing pressurized fluid from conduit 19 to supply pipe 15 through the control valve. At the same time, the recess 83 is replaced by the recess 79.
pipe 1, whereby pipe 1
6 provides discharge communication through a directional control valve to a discharge conduit 81 and tank reservoir 20.

Conversely, when it is desired to move piston 13 to the left as seen in FIG. 1B, pilot control handle 21 is moved in a clockwise direction, thereby causing supply passage 39 and spool passage 36 to through port 62, thereby providing pressurized fluid to transfer conduit 38.
positioning the recess 83 so as to provide the right end of the directional control valve 11 through the directional control valve 11, thereby moving the spool 68 to the left and creating communication between the recesses 73 and 75 of the valve body; Thereby, from conduit 19 through passageway 77 transfer conduit 16
provide pressurized fluid to the At the same time, the spool recess 82 is moved into communication with the valve body recesses 78 and 74, thereby providing a discharge passage from the conduit 15 to the discharge conduit 81.

Valve 10 thus functions as a pressure regulating pilot valve for selectively moving spool 68 of directional control valve 11 as a function of movement of pilot valve handle 21. Compensating valves 84 and 85 may be used, for example, when the piston 13 is caused by the force of the load on the fluid motor 12, and when the fluid flow from the pump 17 is
5, 16 is provided to effectively prevent cavitation of the fluid motor 12 when it is moved more rapidly than provided through 5 and 16. If, for example, cylinder 14 were to retract rapidly during the lowering condition as described above, the pressure within tube 15 and passage 76 would decrease. This pressure drop is also sensed in the valve chamber 87 via the valve chamber 94 and port 93. When the pressure in passage 76 drops below the tank pressure in discharge passage 80 and annular recess 78;
The pressure difference acts on the end of the valve member 86 and lifts it from its seat 89, thus causing the tube 1 of the passageway 76 to
5 to provide compensation fluid to the cylinder 14. As a result, fluid from conduit 16 is transferred through discharge passage 80 to recess 78 and, as a result of disengagement of valve member 86 from seat 89, into passage 76, thereby eliminating fluid into conduit 15. The flow rate is increased, thus effectively preventing cavitation of the motor 12.

As briefly discussed above, the improved pressure regulating pilot valve 10 provides an improved means for allowing the system to operate in a floating condition, i.e., in which the piston 13 may float within the cylinder 14. configured. To achieve such float control, pilot valve 10 drains compensation valve 84 and
It is arranged to hold the spool 68 in its transferred position to allow pressurized fluid to pass through the compensation valve and to allow communication between the pump, tank and cylinder conduits.

For this purpose, the spool 26 is formed with an annular radially outwardly opening recess 98 which communicates with a flow passage 99 of the valve body 24 to which a conduit 92 is connected. The valve body defines a radially inwardly opening annular recess 100 spaced from the passageway 99 .
During normal pressure regulating reciprocating motion of spool 26, recess 95 is maintained in a spaced relationship with recess 100.

As shown in FIG. 1A, recess 100 is connected to exhaust passage 63 through passage 101.
When it is desired to drain the compensation valve 84,
The spool 26 has a recess 98 in communication with a recess 100 to connect the conduit 92 to the discharge passage 63 and thus to the tank reservoir 20 through the conduit 65, thereby opening the rear side of the valve member 86. With the flow drained, compensation valve 84 is moved to a position allowing it to open to allow fluid to enter conduit 15.

Movement of recess 98 in communication with recess 100 is effected by a direct mechanical connection between handle arm 27 and spool 26. Direct mechanical coupling is accomplished by moving plunger 28 downwardly to engage plunger face 49 with upper end portion 102 of spool 26. As a result, the downward movement of the arm 27 and the simultaneous downward movement of the plunger causes the spool 26 to move directly downward, thereby forcing the recess 98 into the recess 100 against the upward biasing action of the spring 53. communicate.

As described above, by providing the recess 98 in the spool 26 and communicating the rear side of the compensation valve 84 with this recess via the conduit 92, the discharge recess 100, the passage 101, and the passage 63 of the pilot valve 10 are connected. Selectively draining the valve through provides simple and inexpensive floating control that obviates the need for expensive and complex auxiliary valving and fluid circuitry of conventional systems.

Industrial Applicability The control system of the present invention is advantageously adapted to a wide range of industrial applications. For example, fluid motor 12 may be used in conjunction with a wide variety of devices that require a floating position. As an example, a loader is used that propels a bucket along the ground. On uneven ground, it is desirable to allow the bucket to follow the contours of the ground. Providing the control with a floating function allows the bucket to follow the contours of the terrain more effectively.

The invention uses one of the compensation valves of the directional control valve normally provided for controlling the cavitation of the motor as a means of providing the desired floating condition.

Other aspects, objects, and advantages of the invention can be obtained from a study of the drawings, specification, and claims.
The foregoing disclosure of specific embodiments illustrates the broad inventive concepts encompassed by the present invention.