Pressure compensating valve

Abstract

The present invention provides a pressure-compensating valve, comprising a valve seat, a valve sleeve, an elastic member, and a valve core assembly. The valve seat is sleeved and fixedly connected to the valve sleeve, the valve seat defines a valve seat cavity, the elastic member sleeves the valve core assembly and is accommodated in the valve seat cavity of the valve seat, the valve core assembly is received in the valve sleeve, one end of the elastic member abuts the valve core assembly, and the other end abuts the valve sleeve. The valve sleeve defines an oil supply port, a priority port, and a bypass port. An induction oil port is formed at an end of the valve sleeve away from the valve seat. The induction oil port and the priority port communicate with the valve seat cavity, and the induction oil port communicates with an external main oil circuit. The valve core assembly reciprocates relative to the valve sleeve under the influence of oil pressure at the priority port and the induction oil port, and regulates the flow between the oil supply port and the priority port, and between the oil supply port and the bypass port. The pressure-compensating valve provided by the present invention, by providing an induction oil port connected to the external main oil circuit, introduces load fluctuations into the adjustment process of the valve core, thereby reducing the impact of load pressure fluctuations on the priority flow.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a pressure compensating valve for fluid control. Background Art

[0002] Pressure-compensating valves provide a stable and constant flow rate to the load connected to the priority port. Oil is supplied to the bypass port only when the oil supply exceeds the load demand at the priority port. This prioritized oil supply characteristic of pressure-compensating valves has led to their widespread application in hydraulic control systems. However, existing pressure-compensating valves cannot eliminate the impact of pressure fluctuations across the load in the main oil circuit on the flow rate at the priority port. Consequently, there is a significant fluctuation between the actual oil supply at the priority port and the theoretical oil supply, which reduces the accuracy of the pressure-compensating valve's regulation. Summary of the Invention

[0003] In view of this, it is necessary to provide an improved pressure compensating valve, which can reduce the impact of load pressure fluctuations on the priority flow and has high regulation accuracy.

[0004] The present invention provides a pressure compensating valve, comprising a valve seat, a valve sleeve, an elastic member, and a valve core assembly. The valve seat is sleeved and fixedly connected to the valve sleeve. A valve seat cavity is defined on the valve seat. The elastic member sleeves the valve core assembly and is accommodated in the valve seat cavity of the valve seat. The valve core assembly is accommodated in the valve sleeve. One end of the elastic member abuts against the valve core assembly, and the other end abuts against the valve sleeve.

[0005] The valve sleeve is provided with an oil supply port, a priority port and a bypass port. An induction oil port is formed at one end of the valve sleeve away from the valve seat. The induction oil port and the priority port are connected to the valve seat cavity. The induction oil port is connected to the external main oil circuit. The valve core assembly reciprocates relative to the valve sleeve under the drive of the oil pressure at the priority port and the induction oil port, and adjusts the flow state between the oil supply port and the priority port and between the oil supply port and the bypass port.

[0006] Furthermore, the valve core assembly includes a valve core, and an oil groove connected to the oil supply port is opened on the valve core, and the oil supply port is connected to the priority port and the bypass port through the oil groove.

[0007] Furthermore, a damping hole is provided on the valve core, and the damping hole is used to buffer the reciprocating sliding of the valve core relative to the valve sleeve.

[0008] Furthermore, the valve core is provided with a valve core cavity extending in the axial direction and communicating with the valve seat cavity. The damping hole includes a first damping hole, and the sensing oil port is communicated with the valve seat cavity through the first damping hole.

[0009] Furthermore, the valve sleeve is provided with an oil through port, the damping hole includes a second damping hole, and the priority port is connected to the valve core cavity through the oil through port and the second damping hole.

[0010] Furthermore, the valve core cavity includes an expansion cavity connected to the valve seat cavity and an extension cavity connected to the sensing oil port, and the valve core assembly includes a mounting seat, which is arranged in the extension cavity;

[0011] The damping hole includes a third damping hole, which is opened on the mounting seat and communicates with the expansion cavity. The sensing oil port is communicated with the valve seat cavity through the third damping hole.

[0012] Furthermore, the mounting seat and the valve core are fixed to each other by at least one of a threaded connection, a key connection, and a pin connection.

[0013] Furthermore, a portion of the oil groove corresponding to the bypass port is configured as a curved surface.

[0014] Furthermore, the valve core assembly further includes a fixing seat, which is sleeved on and fixed to the valve core, and one end of the fixing seat is supported by the elastic member.

[0015] Furthermore, a gasket is provided on one end of the valve sleeve extending into the valve seat, the gasket is sleeved on the valve core and pressed against the valve sleeve by the support of the elastic member; one end of the elastic member abuts the fixed seat, and the other end abuts the gasket.

[0016] The pressure compensating valve provided by the present invention introduces load fluctuations into the adjustment process of the valve core by setting an induction oil port connected to the external main oil circuit, thereby reducing the impact of load pressure fluctuations on the priority flow, thereby improving the accuracy of adjustment and having broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a pressure compensating valve in one embodiment of the present invention;

[0018] Figure 2 for Figure 1 The schematic diagram of the structure of the valve core in the pressure compensation valve shown;

[0019] Figure 3 for Figure 1 An enlarged schematic diagram of the pressure compensating valve at point A is shown.

[0020] Description of main component symbols

[0021]

[0022]

[0023] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that when a component is referred to as being "mounted on" another component, it may be mounted directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] See also Figure 1 , Figure 1 FIG1 is a schematic structural diagram of a pressure compensating valve 100 in one embodiment of the present invention. The pressure compensating valve 100 provided by the present invention is used to provide a stable and constant fluid flow to a target load, thereby providing an appropriate driving flow for the operation of the load.

[0028] The pressure-compensating valve 100 includes a valve sleeve 10, a valve seat 20, a valve core assembly 30, and an elastic member 40. The valve seat 20 is mounted on one end of the valve sleeve 10 and is fixedly connected to the valve sleeve 10. The valve core assembly 30 is housed within the valve sleeve 10. The elastic member 40 is mounted on the end of the valve sleeve 10 that extends into the valve seat 20 and is housed within the valve seat 20. One end of the elastic member 40 abuts the valve core assembly 30, while the other end abuts the valve sleeve 10. The valve sleeve 10 is used to accommodate the valve core assembly 30, the valve seat 20 is used to secure the valve sleeve 10, the valve core assembly 30 is used to control the degree of opening of the pressure-compensating valve 100, and the elastic member 40 is used to provide a preload force to adjust the equilibrium state of the valve core assembly 30.

[0029] Under the support of the valve sleeve 10 and the valve seat 20, the valve core assembly 30 overcomes the preload force provided by the elastic member 40 and changes its position relative to the valve sleeve 10 under the drive of oil pressure, thereby adjusting the opening degree of the pressure compensating valve 100, and then adjusting the oil inlet amount of the load connected to the pressure compensating valve 100 and controlling the operating state of the load.

[0030] Specifically, the valve sleeve 10 is generally hollow cylindrical, with a hollow interior defining a valve sleeve cavity 11 within which the valve core assembly 30 slides. The valve sleeve 10 has two ends: a first end 10a and a second end 10b opposite the first end 10a. The first end 10a of the valve sleeve 10 is mounted on the valve seat 20, thereby achieving a fixed connection between the valve sleeve 10 and the valve seat 20.

[0031] Furthermore, the valve seat 20 is sleeved on the first end 10a of the valve sleeve 10, and the outer side surface of the first end 10a of the valve sleeve 10 is threadedly connected to the inner side surface of the valve seat 20. The threaded connection between the valve sleeve 10 and the valve seat 20 realizes a fixed connection between the valve sleeve 10 and the valve seat 20.

[0032] It is understood that in other embodiments, the valve sleeve 10 and the valve seat 20 may be fixed to each other by other detachable connection methods such as key connection, pin connection, etc.

[0033] The second end 10b of the valve sleeve 10 forms a sensing oil port 12, which is communicated with the valve sleeve cavity 11. The oil pressure at the sensing oil port 12 is equal to the oil pressure required by the load, and it can sense the oil pressure required by the load and drive the valve core assembly 30 to move.

[0034] Furthermore, the valve sleeve 10 is provided with an oil supply port 13, a priority port 14, and a bypass port 15 on its wall. These ports are all connected to the sleeve cavity 11 of the valve sleeve 10, with the oil supply port 13 located between the priority port 14 and the bypass port 15. The oil supply port 13 is used to supply hydraulic oil to the pressure-compensating valve 100, while the priority port 14 and the bypass port 15 are both connected to a load. When the oil supply port 13 is in communication with the priority port 14 or the bypass port 15, the load connected to the corresponding priority port 14 or the bypass port 15 operates under the oil supply from the oil supply port 13, thereby achieving the working process of distributing oil through the pressure-compensating valve 100 and controlling the different operating states of the load.

[0035] Furthermore, the load connected to the priority port 14 has a higher operating priority than the load connected to the bypass port 15. When distributing oil, the pressure compensating valve 100 prioritizes supplying oil to the load connected to the priority port 14, ensuring full power operation of the load connected to the priority port 14. Only when the oil demand of the load connected to the priority port 14 has been met by the supply from the oil supply port 13 will excess oil be supplied to the load connected to the bypass port 15. In other words, the pressure compensating valve 100 will supply oil to the bypass port 15 only after the demand of the priority port 14 has been met.

[0036] It is understood that the number of the oil supply port 13, the priority port 14, and the bypass port 15 can be one or more. In this embodiment, the number of the oil supply port 13, the priority port 14, and the bypass port 15 is multiple. The multiple oil supply ports 13 are spaced one by one along the circumference of the valve sleeve 10 and are centrally symmetrically distributed with respect to the central axis of the valve sleeve 10. Similarly, the multiple priority ports 14 are spaced one by one along the circumference of the valve sleeve 10 and are centrally symmetrically distributed with respect to the central axis of the valve sleeve 10. The multiple bypass ports 15 are also spaced one by one along the circumference of the valve sleeve 10 and are centrally symmetrically distributed with respect to the central axis of the valve sleeve 10.

[0037] Furthermore, a plurality of mounting grooves (unnumbered) are provided on the outer wall of the valve sleeve 10 along the circumferential direction, and a seal 16 and a retaining ring 17 are installed in each mounting groove. The plurality of seals 16 are sleeved on the circumferential wall of the valve sleeve 10 and are spaced apart from each other along the central axis direction of the valve sleeve 10. The seal 16 is used to seal the pressure compensation valve 100 and the external hydraulic component; the retaining ring 17 is adapted to the seal 16, and the retaining ring 17 abuts and fixes the seal 16, thereby limiting the axial movement of the seal 16.

[0038] In this embodiment, the sealing member 16 is an O-ring. It is understood that in other embodiments, the sealing member 16 can also be a V-ring, a sealing filler, or other types of sealing members.

[0039] The valve seat 20 is roughly cylindrical, and a valve seat cavity 21 extending along its axial direction is defined inside the valve seat 20. The valve seat cavity 21 only passes through one end face of the valve seat 20. The valve sleeve 10 is sleeved on the valve seat 20 and is screwed and fixed to the valve sleeve 10. The valve seat 20 is provided for the valve sleeve 10 to be installed.

[0040] The outer side surface of the valve seat 20 is also provided with a plurality of sealing members (not shown), which are used to seal the valve seat 20 and the external hydraulic system.

[0041] Please also refer to Figure 2 , Figure 2 for Figure 1 FIG. 1 is a schematic structural diagram of the valve core 31 in the pressure compensating valve 100 .

[0042] The valve core assembly 30 includes a valve core 31, which is roughly in the shape of a multi-section cylinder. The valve core 31 is housed in the valve sleeve cavity 11 of the valve sleeve 10 and can slide back and forth in the valve sleeve 10. The outer side surface of the valve core 31 is radially recessed and forms an oil groove 311. The oil groove 311 extends roughly in a direction parallel to the axial direction of the valve core 31 and reduces the size of part of the axial section of the valve core 31. The oil groove 311 is connected to the oil supply port 13; when the valve core 31 reaches a position where the oil groove 311 is fully connected to the priority port 14, the bypass port 15 is no longer connected to the oil groove 311. That is, the valve core 31 has a first position, and the oil groove 311 on the valve core 31 in this first position is connected to the priority port 14 and is no longer connected to the bypass port 15.

[0043] After the valve core 31 moves a certain distance toward the oil sensing port 12 of the valve sleeve 10, the position of the oil passage groove 311 changes with the movement of the valve core 31. The oil passage groove 311 continues to communicate with the oil supply port 13. As the valve core 31 moves, the oil passage groove 311 also communicates with the bypass port 15. At this time, the oil passage groove 311 continues to communicate with the priority port 14. In other words, the valve core 31 has a second position. In the second position, the oil passage groove 311 on the valve core 31 communicates with the priority port 14 and the bypass port 15.

[0044] A valve core cavity 312 is formed at the approximate center of the valve core 31. The valve core cavity 312 extends along the axial direction of the valve core 31 and passes through the two end surfaces of the valve core 31. One end of the valve core cavity 312 is connected to the sensing oil port 12, and the other end is connected to the valve seat cavity 21. The valve core cavity 312 is used to guide the oil in the sensing oil port 12 to the valve seat cavity 21, so that the sensing oil port 12 can push the valve core 31 toward the sensing oil port 12 ( Figure 1 Slide in the downward direction.

[0045] Following the same principle, to achieve interconnection between the priority port 14 and the valve seat cavity 21, thereby allowing the fluid pressure at the priority port 14 to be transferred into the valve seat cavity 21 and drive the valve core 31 to move, an oil passage 18 is formed on the peripheral wall of the valve sleeve 10. The oil passage 18 and the priority port 14 are not connected on the valve sleeve 10, but are connected to the same pipeline. In other words, the two are directly connected in the oil circuit but separated on the valve sleeve 10. The oil passage 18 and the valve core cavity 312 are interconnected, allowing the oil at the priority port 14 to reach the valve seat cavity 21 through the oil passage 18 and the valve core cavity 312, thereby transferring the oil pressure to the end face of the valve core 31 to drive the valve core 31 to move.

[0046] In one embodiment of the present invention, in order to buffer the impact of the oil on the wall of the valve core 31 when it flows from the oil supply port 13 to the bypass port 15, the pressure compensation valve 100 provided by the present invention sets the part of the oil groove 311 of the valve core 31 corresponding to the bypass port 15 as a curved surface. The curved surface can be an arc surface, a spherical surface or a curved surface with a complex shape, as long as the curved surface can buffer the hydraulic impact of the oil.

[0047] The outer wall of the valve core 31 is provided with a plurality of pressure equalizing grooves (unnumbered) along the circumferential direction near the bypass port 15. The plurality of pressure equalizing grooves are arranged at intervals along the axial direction of the valve sleeve 10. The function of the pressure equalizing grooves is to reduce the hydraulic clamping phenomenon that occurs during the movement of the valve core 31, thereby ensuring the stability and smoothness of the valve core 31 during the movement.

[0048] Please also refer to Figure 3 , Figure 3 for Figure 1 An enlarged schematic diagram of the pressure compensating valve 100 at point A is shown.

[0049] The valve core assembly 30 includes a fixing seat 32, which is arranged on the outer surface of the valve core 31 and fixedly connected to the valve core 31. The fixing seat 32 is supported by one end of the elastic member 40 so that the elastic force of the elastic member 40 can act on the valve core 31.

[0050] Furthermore, a positioning piece 313 is embedded and fixed on the outer side of the valve core 31, and the positioning piece 313 is sleeved on the valve core 31 and embedded on the valve core 31; the fixing seat 32 is clamped on the positioning piece 313 under the supporting action of the elastic piece 40, thereby realizing the mutual fixation between the fixing seat 32 and the valve core 31.

[0051] One end of the elastic member 40 abuts against the fixed seat 32 of the valve core assembly 30, and the other end abuts against the end surface of the first end 10a of the valve sleeve 10. The elastic member 40 is used to provide a pre-tightening force. When the valve core 31 slides in the valve sleeve 10 toward the first end 10a of the valve sleeve 10 under the drive of the oil in the sensing oil port 12, the movement of the valve core 31 needs to overcome the elastic deformation of the elastic member 40; and when the oil pressure in the sensing oil port 12 drops, the elastic member 40 can drive the valve core 31 to slide toward the second end 10b of the valve sleeve 10.

[0052] Furthermore, in order to prevent the elastic member 40 from directly abutting against the valve sleeve 10 and causing contact wear on the inner wall of the valve sleeve 10, a gasket 19 is provided on the first end 10a of the valve sleeve 10. The gasket 19 is roughly annular and has a portion where the valve core 31 extends into the valve seat 20. One end of the gasket 19 contacts the first end 10a of the valve sleeve 10, and the other end is pressed against the first end 10a of the valve sleeve 10 by the abutment of the elastic member 40.

[0053] The setting of the gasket 19 avoids direct contact between the elastic member 40 and the valve sleeve 10, and can avoid problems such as contact surface crushing of the valve sleeve 10 due to excessive elastic compression force. The replacement cost of the gasket 19 is very low, and it is also beneficial to ensure the reliability and stability of the pressure compensation valve 100 under long-term operation.

[0054] Figure 1 FIG. 1 shows a working state diagram of the pressure compensating valve 100 when it is in an initial state. The working principle of the pressure compensating valve 100 will be briefly explained below based on the above structure.

[0055] When the oil supply port 13 of the pressure compensating valve 100 begins to supply oil, the valve core 31, under the elastic action of the elastic member 40, is at its extreme position, farthest from the sensing oil port 12. At this point, the oil supply port 13 is connected to the priority port 14, while the bypass port 15 is sealed by the valve core 31 and is not connected to the oil groove 311 or the oil supply port 13. When the oil supply port 13 begins to supply oil, all the oil flows out of the pressure compensating valve 100 through the priority port 14, thus establishing the initial priority oil supply from the pressure compensating valve 100 to the load connected to the priority port 14.

[0056] When the oil supply port 13 continues to supply oil to the priority port 14, the oil in the priority port 14 will pass through the oil passage 18 and along the valve core cavity 312 to reach the valve seat cavity 21. The oil pressure in the priority port 14 will push the valve core 31 toward the first end 10a of the valve sleeve 10 while compressing the elastic member 40. The elastic deformation of the elastic member 40 provides a reverse elastic force. At this time, the oil in the sensing oil port 12 compensates for the change in load pressure. That is, the valve core 31 is instantly subjected to the positive oil pressure force of the priority port 14, the reverse oil pressure force of the sensing oil port 12, and the reverse elastic force of the elastic member 40.

[0057] As the oil pressure is further transmitted, the connecting effect of the relatively narrow and long valve core cavity 312 becomes apparent, and the oil pressure in the sensing oil port 12 will be transmitted to the valve seat cavity 21; at this time, the forces provided by the sensing oil port 12, the priority port 14 and the elastic member 40 form a balanced state; in this state, the oil in the oil supply port 13 all flows to the load connected to the priority port 14, thus forming a continuous oil supply from the pressure compensating valve 100 to the load connected to the priority port 14; at this point, the pressure compensating valve 100 forms an oil supply to the load of the priority port 14 in a balanced state.

[0058] When the flow rate required by the load group decreases, that is, the oil pressure of the entire load group sensed at the sensing oil port 12 decreases, the valve core 31 will be pushed by the oil pressure of the priority port 14 to move toward the first end 10a of the valve sleeve 10 until the bypass port 15 is opened, and the excess flow flows through the bypass port 15 to the corresponding connected load and drives the load to operate; at this time, the compression amount of the elastic member 40 changes and a balanced state is re-established with the priority port 14 and the sensing oil port 12; at this point, the pressure compensating valve 100 forms an oil supply to the priority port 14 and the bypass port 15 in a balanced state.

[0059] The present invention provides a sensing oil port 12, which is connected to the load group in the main oil circuit. Therefore, the load oil pressure in the main oil circuit can be transmitted to the sensing oil circuit 12, and the oil pressure at the priority port 14 can gradually change with the load change; that is, when the load demand changes, the valve core 31 will slide with the change of the driving force, thereby changing the effective communication area of the priority port 14, ensuring that the output oil of the priority port 14 remains constant.

[0060] Since the load demand fluctuation will cause the oil pressure at the sensing oil port 12 and the priority port 14 to fluctuate, the oil pressure fluctuation will directly cause the valve core 31 to be in a frequent actuation response process, which will not only greatly increase the slippage of the valve core 31 and increase wear, but also greatly reduce the opening and closing performance of the pressure compensation valve 100, resulting in a significant decrease in the reliability and stability of the pressure compensation valve 100.

[0061] In order to reduce the response sensitivity of the pressure compensating valve 100 to load pressure fluctuations and improve the movement stability of the valve core 31 in the valve sleeve 10, the pressure compensating valve 100 provided by the present invention has a damping hole 50 opened in the valve core assembly 30. The damping hole 50 can buffer the driving effect of the oil pressure on the valve core assembly 30, so that the reciprocating sliding of the valve core assembly 30 under the drive of the oil pressure can be carried out at a relatively slow speed. The sensitivity of the valve core assembly 30 is reduced without affecting the opening and closing of the pressure compensating valve 100, thereby improving the reliability and stability of the pressure compensating valve 100.

[0062] In one embodiment of the present invention, the damping hole 50 includes a first damping hole 51, which is opened on the valve core 31. One end of the first damping hole 51 is connected to the sensing oil port 12, and the other end is connected to the valve core chamber 312. The oil pressure in the sensing oil port 12 reaches the valve seat chamber 21 through the valve core chamber 312. It must pass through the damping effect of the first damping hole 51 before it can be connected to the valve seat chamber 21.

[0063] The aperture of the first damping hole 51 is smaller than the aperture of the valve core cavity 312, so the oil will be damped when passing through the first damping hole 51. The amplitude of the force of the oil is weakened relatively smoothly under the damping effect of the first damping hole 51. Therefore, the oil reaching the valve seat cavity 21 from the sensing oil port 12 is buffered, and the corresponding actuation frequency of the valve core 31 is reduced.

[0064] In one embodiment of the present invention, the damping orifice 50 includes a second damping orifice 52. One end of the second damping orifice 52 communicates with the valve core chamber 312, and the other end communicates with the oil port 18. Communication between the priority port 14 and the valve seat chamber 21 is achieved through the oil port 18, the second damping orifice 52, and the valve core chamber 312. The second damping orifice 52 provides a damping effect on the oil at the priority port 14, buffering the driving frequency of the priority port 14 on the valve core 31, thereby achieving a buffering effect on the valve core 31.

[0065] In one embodiment of the present invention, the valve core assembly 30 includes a mounting seat 33, and the valve core cavity 312 includes an extension cavity 3121 connected to the valve seat cavity 21 and an extension cavity 3122 connected to the sensing oil port 12. The extension length of the extension cavity 3122 is longer than the extension length of the extension cavity 3121. The extension cavity 3122 is used to provide a circulation channel for the oil, and the extension cavity 3121 is used for installing and fixing the mounting seat 33.

[0066] The damping hole 50 includes a third damping hole 53, which is opened on the mounting seat 33. One end of the third damping hole 53 is connected to the valve seat cavity 21, and the other end is connected to the extension cavity 3122. The third damping hole 53 is used to further buffer the effect of the oil flowing into the valve seat cavity 21 from the sensing oil port 12, thereby reducing the driving response of the valve core 31 to the oil.

[0067] The third damping hole 53 is opened on the mounting seat 33 so that the mounting seat 33 can be removed from the valve core 31, so that the size of the third damping hole 53 can be changed as the mounting seat 33 is replaced. The specific size of the third damping hole 53 can be changed by replacing the mounting seat 33 according to the flow requirement.

[0068] Furthermore, the outer side surface of the mounting seat 33 is provided with an external thread, and the inner side surface of the expansion cavity 3121 is provided with an internal thread. The mounting seat 33 is threaded and installed in the expansion cavity 3121, thereby achieving a detachable connection with the valve core 31.

[0069] It is understandable that in other embodiments, the mounting seat 33 and the valve core 31 may be connected by other detachable connection methods such as pin connection, key connection, etc.

[0070] The pressure compensating valve 100 provided by the present invention buffers the reciprocating sliding of the valve core assembly 30 relative to the valve sleeve 10 by opening a damping hole 50 on the valve core assembly 30, appropriately reduces the response sensitivity of the valve core 31, and can avoid frequent jitter of the valve core 31 in the valve sleeve 10, thereby improving its own reliability and stability, and has broad application prospects.

[0071] The pressure compensating valve 100 provided by the present invention introduces load fluctuations into the adjustment process of the valve core 31 by setting an induction oil port 12 connected to the external main oil circuit, thereby reducing the impact of load pressure fluctuations on the priority flow, thereby improving the accuracy of adjustment, and has broad application prospects.

[0072] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. Any appropriate changes and modifications to the above embodiments fall within the scope of the present invention as long as they are within the spirit of the present invention.

Claims

1. A pressure compensating valve, comprising a valve seat, a valve sleeve, an elastic member, and a valve core assembly, wherein the valve seat is sleeved and fixedly connected to the valve sleeve, the valve seat defines a valve seat cavity, the elastic member sleeves the valve core assembly and is accommodated in the valve seat cavity of the valve seat, the valve core assembly is accommodated in the valve sleeve, one end of the elastic member abuts the valve core assembly, and the other end abuts the valve sleeve, characterized in that: The valve sleeve is provided with an oil supply port, a priority port, and a bypass port. An induction oil port is formed at one end of the valve sleeve away from the valve seat. The induction oil port and the priority port are in communication with the valve seat cavity. The induction oil port is in communication with an external main oil circuit. The valve core assembly can reciprocate relative to the valve sleeve under the drive of the oil pressure at the priority port and the induction oil port, and adjust the flow state between the oil supply port and the priority port, and between the oil supply port and the bypass port. A damping hole is provided in the valve core assembly, and the damping hole is used to buffer the reciprocating sliding of the valve core assembly relative to the valve sleeve; The valve core assembly includes a valve core, and an oil groove communicating with the oil supply port is formed on the valve core, and the oil supply port is communicated with the priority port and the bypass port through the oil groove; The outer wall of the valve sleeve is provided with a sealing member.

2. The pressure compensating valve according to claim 1, wherein: The valve core is provided with a valve core cavity extending in the axial direction and communicating with the valve seat cavity. The damping hole includes a first damping hole, and the sensing oil port is communicated with the valve seat cavity through the first damping hole.

3. The pressure compensating valve according to claim 2, wherein: The valve sleeve is provided with an oil passage, the damping hole includes a second damping hole, and the priority port is connected to the valve core cavity through the oil passage and the second damping hole.

4. The pressure compensating valve according to claim 2, wherein: The valve core cavity includes an expansion cavity connected to the valve seat cavity and an extension cavity connected to the sensing oil port, and the valve core assembly includes a mounting seat, which is arranged in the extension cavity; The damping hole includes a third damping hole, which is opened on the mounting seat and communicates with the expansion cavity. The sensing oil port is communicated with the valve seat cavity through the third damping hole.

5. The pressure compensating valve according to claim 4, wherein: The mounting seat and the valve core are fixed to each other by at least one of a threaded connection, a key connection, and a pin connection.

6. The pressure compensating valve according to claim 1, wherein: The portion of the oil passage groove corresponding to the bypass port is configured as a curved surface.

7. The pressure compensating valve according to claim 1, wherein: The valve core assembly further comprises a fixing seat, which is sleeved on and fixed to the valve core, and one end of the fixing seat is supported by the elastic member.

8. The pressure compensating valve according to claim 7, wherein: A gasket is provided on one end of the valve sleeve extending into the valve seat. The gasket is sleeved on the valve core and pressed against the valve sleeve under the support of the elastic member. One end of the elastic member abuts the fixed seat, and the other end abuts the gasket.

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