CN218118182U - Pressure compensation valve and multi-way reversing valve - Google Patents

Abstract

The utility model relates to a hydrovalve technical field, concretely relates to pressure compensating valve and multichannel conversion valve. The method comprises the following steps: the valve body is internally provided with a first oil duct, a second oil duct and an LS oil duct; the first valve core is assembled in the valve body in a sliding mode and controls the oil in the first oil duct to flow to the second oil duct in a one-way mode in a sliding mode; the second valve core is assembled in the valve body in a sliding mode and controls the connection and disconnection between the second oil duct and the LS oil duct in a sliding mode; the elastic piece acts on the second valve core; the first valve core and the second valve core are arranged adjacently along the axial direction, in an initial state, under the action of the elastic part, the second valve core pushes the first valve core to be tightly abutted against the limiting position of the valve body, and the first oil duct, the second oil duct and the LS oil duct are not communicated; when pressure is taken, oil in the second oil duct flows between the first valve core and the second valve core firstly, and then enters the LS oil duct through the second valve core. The pressure compensating valve in the prior art is used for taking pressure from the oil inlet containing cavity and solves the technical problem that the pressure taking is unstable.

Description

Pressure compensation valve and multi-way reversing valve

Technical Field

The utility model relates to a hydrovalve technical field, concretely relates to pressure compensating valve and multichannel conversion valve.

Background

The pressure compensation valve is widely applied in the field of engineering machinery, taking an excavator as an example, which includes basic motions such as a boom, an arm, a bucket, a dozer, a swing, a complete machine walking and the like, but in an actual working condition, in order to improve working efficiency, composite operation of the above basic motions is often required, high-pressure oil is provided to a plurality of execution elements through a hydraulic reversing valve by the flow provided by a hydraulic pump, when the maximum flow provided by the hydraulic pump is smaller than the total flow required by a system, the hydraulic oil preferentially flows to the execution element with lower load pressure, and the execution element with higher load pressure reduces speed or stops running.

As disclosed in document CN201721304183.1, a pressure compensation valve is disclosed, and specifically discloses: a pressure compensation valve comprises a valve body and a valve sleeve arranged on the valve body, wherein the valve body is provided with an oil inlet cavity and an oil outlet cavity, the oil inlet cavity is communicated with an LS flow channel, a compensation valve core is movably arranged in the valve sleeve, the lower end of the compensation valve core is provided with a valve core, the compensation valve core moves up and down to enable the oil inlet cavity and the LS flow channel to be communicated or disconnected, and the valve core is opened or closed to enable the oil inlet cavity and the oil outlet cavity to be communicated or disconnected; in addition, the cross sectional area of the upper end surface of the compensation valve core is not equal to that of the lower end surface of the valve core; the compensation valve core moves up and down to enable the oil inlet containing cavity to be communicated with or disconnected from the LS flow passage for obtaining the highest load pressure, and the effect of the shuttle valve is equivalent.

The pressure compensation valve in the above document can play a role in pressure compensation, but LS pressure taking is performed from the oil inlet containing cavity, the oil inlet containing cavity is located in the axial direction of the compensation valve core, oil can directly impact the pressure taking port, and pressure taking is unstable.

SUMMERY OF THE UTILITY MODEL

In order to solve the pressure compensating valve among the prior art and hold the chamber from the oil feed and get the pressure, get the unstable technical problem of pressure, the utility model provides a pressure compensating valve and multichannel switching-over valve have solved above-mentioned technical problem. The technical scheme of the utility model as follows:

a pressure compensating valve comprising:

the valve comprises a valve body, wherein a first oil duct, a second oil duct and an LS oil duct are formed in the valve body;

the first valve core is assembled in the valve body in a sliding mode and controls the oil in the first oil duct to flow to the second oil duct in a one-way mode in a sliding mode;

the second valve core is assembled in the valve body in a sliding mode and controls the connection and disconnection between the second oil channel and the LS oil channel in a sliding mode;

the elastic piece acts on the second valve core;

the first valve core and the second valve core are arranged adjacently along the axial direction, in an initial state, under the action of the elastic part, the second valve core pushes the first valve core to be tightly propped against the limiting position of the valve body, and the first oil duct, the second oil duct and the LS oil duct are not communicated with each other; when pressure is taken, oil in the second oil duct flows between the first valve core and the second valve core firstly, and then enters the LS oil duct through the second valve core.

The utility model discloses a pressure compensating valve is provided with two spools, the one-way circulation between first oil duct of first spool control and the second oil duct, and second spool control LS oil duct is followed the second oil duct and is got pressure. When the pressure compensation valve is used in a multi-way reversing valve, the first oil duct is communicated with the pressure oil duct, and the second oil duct is communicated with the working oil duct, so that compared with the prior art that pressure is taken from the first oil duct, the pressure taking port is impacted by a large oil flow speed, and the pressure taking pressure is fluctuated greatly; in this application, the LS oil duct is got the pressure from the second oil duct, and this department fluid can not direct impact get the pressure mouth, and it is stable to get pressure.

According to the utility model discloses an embodiment, under the initial condition, the elastic component acts on the first end of second case, the second end terminal surface of second case supports and leans on the first end terminal surface of first case, the second end terminal surface of second case is greater than the first end terminal surface of first case.

According to the utility model discloses an embodiment, fluid in the first oil duct acts on the second end terminal surface of first case, fluid in the first oil duct promotes first case slides and opens, so that fluid one-way circulation in the first oil duct extremely the second oil duct.

According to the utility model discloses an embodiment, the second end of first case is formed with first passageway, fluid warp in the first oil duct the first passageway enters into the second oil duct, the one end of first passageway extends to the first end terminal surface of first case, the other end of first passageway extends to the outer peripheral face of the first end of first case.

According to the utility model discloses an embodiment, fluid in the second oil duct acts on first case with the second case, fluid in the second oil duct does first case with the second valve core provides the axial effort that the direction was carried on the back mutually.

According to the utility model discloses an embodiment, the second end of second case is formed with the second passageway, fluid in the second oil duct passes through the second passageway communicates with the LS oil duct, the one end of second passageway extends to the first end terminal surface of second case, the other end of second passageway extends to the outer peripheral face of second case.

According to the utility model discloses an embodiment, the first end department of second case is formed with and holds the chamber, hold the chamber with LS oil duct intercommunication, second case sliding control the second passageway with hold the break-make between the chamber.

According to the utility model discloses an embodiment, the first end of first case is formed with the third passageway, the fluid of second oil duct passes through the third passageway enters into first case with between the second valve core.

According to the utility model discloses an embodiment, be formed with the bellying on the middle part outer peripheral face of first case, the bellying with conical surface sealing fit between the valve body.

A multiple directional control valve comprising:

the pressure compensation valve is characterized in that a pressure oil duct, a working oil duct and an oil return duct are formed in the valve body;

the main valve core is assembled in the valve body in a sliding mode, and the main valve core controls the on-off of the pressure oil channel and the first oil channel and the on-off of the working oil channel, the second oil channel and the oil return channel in a sliding mode.

Based on the technical scheme, the utility model discloses the technological effect that can realize does:

1. the utility model discloses a pressure compensating valve is provided with two spools, the one-way circulation between first oil duct of first spool control and the second oil duct, and second spool control LS oil duct is followed the second oil duct and is got pressure. When the pressure compensation valve is used in the multi-way reversing valve, the first oil duct is communicated with the pressure oil duct, and the second oil duct is communicated with the working oil duct, so that compared with the prior art in which pressure is taken from the first oil duct, the pressure of oil is changed by the hydrostatic pressure and pressure of the oil under the influence of the flow speed of the oil flowing into the first oil duct after the oil passes through the main valve core throttling groove, and LS pressure taking pressure fluctuates; in the application, the LS oil passage performs pressure tapping from the second oil passage, oil liquid at the position cannot directly impact a pressure tapping opening, and the pressure tapping pressure is stable;

2. the first valve core and the second valve core of the pressure compensation valve of the utility model are arranged adjacently in the axial direction, and the second end face of the second valve core is larger than the first end face of the first valve core, so that the end faces of the first valve core and the second valve core can be abutted against synchronous motion under the action of the oil pressure of the first oil duct and the elastic part, and can also move in a reverse direction under the action of the oil pressure of the second oil duct, thereby facilitating pressure taking; in addition, the action surface of the oil of the second oil duct acting on the first valve core is a circular surface, the resetting force is large, and the first valve core is quickly reset;

3. the utility model discloses a pressure compensating valve sets up the third passageway at the first end of first case, can realize under any state, the second oil duct all can with the second passageway intercommunication in the second valve core, the break-make between second oil duct and the LS oil duct can be controlled in the slip of second valve core.

Drawings

Fig. 1 is a schematic structural diagram of a pressure compensating valve of the present invention;

FIG. 2 is a schematic structural view of a first valve spool;

FIG. 3 is a schematic structural view of a second valve spool;

fig. 4 is a schematic structural view of the multi-way reversing valve of the present invention in an initial state;

FIGS. 5-6 are views illustrating the state of the main spool of the multi-way reversing valve reversing left;

FIG. 7 is an enlarged view of section C of FIG. 6;

in the figure: 1-a valve body; 11-a first oil passage; 12-a second oil passage; 13-pressure oil ducts; 14-working oil ducts; 15-oil return duct; 2-a first valve core; 21-a first channel; 211-first axial bore; 212-a first radial hole; 22-a third channel; 221-a third axial bore; 222-a third radial hole; 23-a boss; 231-a conical surface; 3-a second valve core; 31-a second channel; 311-second axial bore; 312-a second radial hole; 4-an elastic member; 5-valve sleeve; 51-a containment chamber; 6-main valve core.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the directional terms such as "front, back, upper, lower, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and in the case of not making a contrary explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1 to 7, the present embodiment provides a pressure compensation valve, which includes a valve body 1, a first oil passage 11, a second oil passage 12, and an LS oil passage are formed in the valve body 1, a first valve element 2 and a second valve element 3 are slidably assembled in the valve body 1, the first valve element 2 slidably controls the connection and disconnection between the first oil passage 11 and the second oil passage 12, and the second valve element 3 slidably controls the connection and disconnection between the second oil passage 12 and the LS oil passage. An elastic part 4 is further arranged, and in an initial state, under the action of the elastic part 4, the second valve core 3 can push the first valve core 2 to abut against the limiting position of the valve body 1.

The valve body 1 is blocky, is formed with the axially extended mounting hole in the valve body 1, and first oil duct 11, second oil duct 12 and LS oil duct all extend to and communicate with the mounting hole, and the second oil duct 12 is located between the first oil duct 11, the LS oil duct and the intercommunication mouth of mounting hole with the intercommunication mouth of mounting hole. The first valve spool 2 and the second valve spool 3 are arranged axially adjacent in the mounting bore.

As a preferred solution of this embodiment, in order to facilitate the assembly of the two valve spools, the mounting hole may extend to the outer surface of the valve body 1, and the first valve spool 2 and the second valve spool 3 may be sequentially installed, and the valve sleeve 5 may be assembled, such that the first valve spool 2 and the second valve spool 3 are slidably assembled in the valve body 1.

The outer surface of the middle part of the first valve core 2 is provided with a convex part 23, the convex part 23 is used as a boundary, the first end of the first valve core 2 is positioned on one axial side of the convex part 23, and the second end of the first valve core 2 is positioned on the other axial side of the convex part 23. In an initial state, a first end of the protrusion 23 close to the first valve element 2 abuts against the second valve element 3, the protrusion 23 of the first valve element 2 abuts against an inner wall of the valve body 1, and a second end of the first valve element 2 extends into the first oil passage 11.

The pressure oil in the first oil passage 11 acts on the second end face of the first valve core 2, a first passage 21 is formed at the second end of the first valve core 2, and the oil in the first oil passage 11 enters the second oil passage 12 through the first passage 21. One end of the first passage 21 extends to the second end face of the first spool 2, and the other end of the first passage 21 extends to the second end outer peripheral face of the first spool 2.

As a preferable technical solution of the present embodiment, an end surface of the protrusion 23 abutting against the valve body 1 is a conical surface, and the protrusion 23 can be in sealing fit with the conical surface between the limit positions of the valve body 1 to block the first oil passage 11 and the second oil passage 12.

As a preferable mode of the present embodiment, the first passage 21 includes a first axial hole 211 and a first radial hole 212, one end of the first axial hole 211 extends to the second end surface of the first spool 2, the other end of the first axial hole 211 communicates with one end of the first radial hole 212, and the other end of the first radial hole 212 extends to the outer peripheral surface of the second end of the first spool 2. In the initial state, the opening of the first radial hole 212 extending to the second end outer circumferential surface is blocked by the inner wall of the valve body 1, so that the first oil passage 11 and the second oil passage 12 are not communicated with each other. Preferably, the first radial hole 212 may be a plurality of first radial holes 212, and the plurality of first radial holes 212 are uniformly arranged along the circumferential direction and communicate with the first axial hole 211.

In order to realize pressure tapping from the second oil passage 12, the first end of the first valve core 2 is further formed with a third channel 22, the third channel 22 includes a third axial hole 221 and a third radial hole 222, one end of the third axial hole 221 extends to the first end face of the first valve core 2, the other end of the third axial hole 221 is communicated with one end of the third radial hole 222, and the other end of the third radial hole 222 extends to the outer peripheral surface of the first end of the first valve core 2. Preferably, the third radial holes 222 may be plural, and the plural third radial holes 222 are uniformly arranged in the circumferential direction and communicate with the third axial hole 221.

The second spool 3 is slidably fitted in a valve housing 5, the valve housing 5 is fixed to the valve body 1, and the elastic member 4 is fitted in the valve housing 5, the elastic member 4 acts on a first end of the second spool 3, and a second end of the second spool 3 is adjacent to a first end of the first spool 2. In the initial state, the second end surface of the second valve core 3 abuts against the first end surface of the first valve core 2 under the action of the elastic element 4. The elastic member 4 may be selected from, but not limited to, a spring.

As a preferable aspect of the present embodiment, the second end surface of the second spool 3 is larger than the first end surface of the first spool 2, so that the oil in the second oil passage 12 can simultaneously act on the first spool 2 and the second spool 3 even in the case where the first spool 2 and the second spool 3 abut together. Specifically, the oil in the second oil duct 12 can act on the protruding portion 23 to push the first valve element 2 to be pressed on the inner wall of the valve body 1; the oil in the second gallery 12 may push the second spool 3 by acting on the second end face of the first spool 2.

As a preferable mode of the present embodiment, in order to realize that the second spool 3 controls the second oil passage 12 to communicate with the LS oil passage, the second end of the second spool 3 is formed with a second passage 31, one end of the second passage 31 extends to the second end face of the second spool 3, and the other end of the second passage 31 extends to the second end outer peripheral surface of the second spool 3. Specifically, the second passage 31 includes a second axial hole 311 and a second radial hole 312, one end of the second axial hole 311 extends to the second end surface of the second spool 3, the other end of the second axial hole 311 communicates with one end of the second radial hole 312, and the other end of the second radial hole 312 extends to the second end outer peripheral surface of the second spool 3. Preferably, the second radial holes 312 may be plural, and the plural second radial holes 312 are uniformly arranged in the circumferential direction and communicate with the second axial hole 311.

As a preferable technical solution of this embodiment, an outer diameter of the first end of the second valve core 3 is reduced to form a stepped surface, the elastic member 4 can be sleeved on the first end of the second valve core 3, one end of the elastic member 4 abuts against the valve sleeve 5, and the other end abuts against the stepped surface of the second valve core 3.

An accommodating cavity 51 is formed in the valve sleeve 5, an oil hole is formed in the valve sleeve 5, and the accommodating cavity 51 is communicated with the LS oil passage through the oil hole. When the second spool 3 slides against the urging force of the elastic member 4 until the second passage 31 communicates with the accommodating chamber 51, the second oil passage 12 can communicate with the LS oil passage.

The embodiment further provides a multi-way reversing valve, which includes the pressure compensation valve, an assembly hole is further formed in the valve body 1, the main valve element 6 is slidably assembled in the assembly hole, a pressure oil duct 13, a working oil duct 14 and an oil return duct 15 are further arranged in the valve body 1, the first oil duct 11, the second oil duct 12, the pressure oil duct 13, the working oil duct 14 and the oil return duct 15 are all communicated with the assembly hole, and the main valve element 6 controls the communication between the working oil duct 14 and the pressure oil duct 13 as well as between the working oil duct 14 and the oil return duct 15 in a sliding manner. Preferably, under the control of main spool 6, oil in pressure oil passage 13 must pass through first oil passage 11, pressure compensating valve and second oil passage 12 in sequence before entering working oil passage 14.

As a preferred technical solution of the present embodiment, the second oil passages 12 are symmetrically arranged, and two ends of the second oil passages 12 respectively extend to be communicated with the assembly holes; the number of the working oil passages 14 is two, the two working oil passages 14 are respectively connected with a working oil port A and a working oil port B, and the two working oil passages 14 are symmetrically arranged; the oil return ducts 15 are symmetrically arranged, and two ends of the oil return ducts 15 extend to be communicated with the assembly holes respectively. Along the axial direction of main valve element 6, pressure oil duct 13 and first oil duct 11 are located between two ends of second oil duct 12, second oil duct 12 is located between two working oil ducts 14, and two ends of oil return duct 15 are located on two axial sides of two working oil ducts 14.

Based on the structure, the working principle of the multi-way reversing valve of the embodiment is as follows:

in an initial state, as shown in fig. 4, the main valve element 6 is in a middle position, the second valve element 3 pushes the first valve element 2 to abut against a limit position on the inner wall of the valve body 1 under the action of the elastic element 4 of the pressure compensation valve, and at this time, all oil ducts are not communicated.

When the main valve element 6 is reversed to the left, as shown in fig. 5, the load pressure of the working oil port a is fed back to the LS oil passage through the pressure compensation valve, so that the output pressure of the main pump is always higher than the pressure of the LS oil passage. Specifically, at this time, the main valve element 6 controls a working oil duct 14 communicated with a working oil port a to be communicated with a second oil duct 12, oil at the working oil port a enters the second oil duct 12, the oil in the second oil duct 12 acts on the first valve element 2 and the second valve element 3, the oil in the second oil duct 12 presses the first valve element 2 to the limiting position of the valve body 1, and the first oil duct 11 is not communicated with the second oil duct 12; meanwhile, the oil in the second oil passage 12 pushes the second valve core 3 to slide against the acting force of the elastic element 4 until the second passage 31 is communicated with the LS oil passage, and the LS oil passage takes pressure from the second oil passage 12.

When main valve element 6 is reversed to the left, as shown in fig. 6-7, main valve element 6 controls pressure oil duct 13 to be communicated with first oil duct 11, when the oil pressure in first oil duct 11 is greater than the oil pressure in second oil duct 12, first valve element 2 slides to open, oil in first oil duct 11 can flow to second oil duct 12, then enters working oil port a through main valve element 6 and working oil duct 14, working oil port B is communicated with oil return oil duct 15, oil is fed from working oil port a, and oil is returned from working oil port B. At this time, a gap D exists between the boss 23 of the first valve spool 2 and the opening of the valve sleeve 5, and the oil in the second oil passage 12 can enter the LS oil passage through the gap D, the third passage 22, and the second passage 31.

When main spool 6 reverses direction to the right, the same principle as described above.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. A pressure compensating valve, comprising:

the oil-saving valve comprises a valve body (1), wherein a first oil duct (11), a second oil duct (12) and an LS oil duct are formed in the valve body (1);

the first valve core (2) is assembled in the valve body (1) in a sliding mode, and the first valve core (2) controls oil in the first oil duct (11) to flow to the second oil duct (12) in a one-way mode in a sliding mode;

the second valve spool (3) is assembled in the valve body (1) in a sliding mode, and the second valve spool (3) controls the connection and disconnection between the second oil channel (12) and the LS oil channel in a sliding mode;

an elastic member (4), the elastic member (4) acting on the second spool (3);

the first valve core (2) and the second valve core (3) are arranged adjacently along the axial direction, in an initial state, under the action of the elastic part (4), the second valve core (3) pushes the first valve core (2) to be tightly abutted against the limiting position of the valve body (1), and the first oil duct (11), the second oil duct (12) and the LS oil duct are not communicated; when pressure is taken, oil in the second oil duct (12) flows between the first valve core (2) and the second valve core (3) firstly, and then enters the LS oil duct through the second valve core (3).

2. A pressure compensating valve according to claim 1, characterised in that in an initial state the resilient member (4) acts on a first end of the second valve spool (3), a second end surface of the second valve spool (3) abutting against a first end surface of the first valve spool (2), the second end surface of the second valve spool (3) being larger than the first end surface of the first valve spool (2).

3. A pressure compensating valve according to claim 2, characterized in that the oil in the first oil passage (11) acts on the second end face of the first valve element (2), and the oil in the first oil passage (11) pushes the first valve element (2) to slide open, so that the oil in the first oil passage (11) flows to the second oil passage (12) in one way.

4. A pressure compensating valve according to claim 3, wherein a first passage (21) is formed at the second end of the first valve element (2), oil in the first oil passage (11) enters the second oil passage (12) through the first passage (21), one end of the first passage (21) extends to the first end face of the first valve element (2), and the other end of the first passage (21) extends to the outer peripheral surface of the first end of the first valve element (2).

5. A pressure compensating valve according to claim 3, characterised in that the oil in the second oil channel (12) acts on the first spool (2) and the second spool (3), and that the oil in the second oil channel (12) provides axial forces on the first spool (2) and the second spool (3) in opposite directions.

6. A pressure compensating valve as claimed in claim 5, characterised in that the second end of the second valve spool (3) is formed with a second passage (31), the oil in the second oil passage (12) communicating with the LS oil passage via the second passage (31), one end of the second passage (31) extending to the first end face of the second valve spool (3), the other end of the second passage (31) extending to the outer peripheral face of the second valve spool (3).

7. A pressure compensating valve as claimed in claim 6, characterised in that a receiving chamber is formed at a first end of the second spool (3), the receiving chamber communicating with the LS oil passage, the second spool (3) slidingly controlling the connection and disconnection between the second passage (31) and the receiving chamber.

8. A pressure compensating valve according to any of claims 3-7, characterised in that the first end of the first spool (2) is formed with a third channel (22), and that oil from the second oil channel (12) is led through the third channel (22) to between the first spool (2) and the second spool (3).

9. A pressure compensating valve as claimed in claim 1, wherein the first valve element (2) has a raised portion (23) formed on the outer peripheral surface of the middle portion thereof, and the raised portion (23) is in conical surface sealing engagement with the valve body (1).

10. A multiple directional control valve, comprising:

the pressure compensating valve according to any one of claims 1 to 9, wherein a pressure oil passage (13), a working oil passage (14), and an oil return passage (15) are formed in the valve body (1);

main valve core (6), main valve core (6) slip assembly is in valve body (1), main valve core (6) slip control pressure oil duct (13) with break-make between first oil duct (11) to and break-make between work oil duct (14) and second oil duct (12), oil return oil duct (15).

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