CN218760684U

CN218760684U - Pilot-operated proportional pressure reducing valve

Info

Publication number: CN218760684U
Application number: CN202222960830.1U
Authority: CN
Inventors: 宋兆柱
Original assignee: Beijing Hongji Shida Hydraulic Co ltd
Current assignee: Beijing Hongji Shida Hydraulic Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-28
Anticipated expiration: 2032-11-07

Abstract

The application relates to the field of pressure reducing valves, in particular to a pilot type proportional pressure reducing valve which comprises a pressure reducing valve, a pilot valve, an electromagnet and a current stabilizer, wherein the pilot valve is arranged on one side of the pressure reducing valve and used for controlling the pressure reducing valve to work, the electromagnet is arranged at one end, far away from the pressure reducing valve, of the pilot valve and used for controlling the pilot valve to use, and the current stabilizer is arranged between the pressure reducing valve and the pilot valve and used for adjusting pressure; the pressure reducing valve comprises a shell, a valve core and a pressure reducing spring, and a shell cover is arranged at one end, close to the pressure reducing spring, of the pilot shell; the pilot shell is internally provided with four channels T, B, P and A for oil flowing and a U-shaped channel for pressure transformation; the P channel is communicated with the current stabilizer; the flow stabilizer comprises a flow stabilizing shell, a flow stabilizing core arranged in the flow stabilizing shell, a cross-shaped channel is arranged at the center of the flow stabilizing core, and the flow stabilizing core is further arranged far away from a flow stabilizing spring at one end of the P channel. This application has the effect of pressure in the quick balanced valve.

Description

Pilot-operated proportional pressure reducing valve

Technical Field

The application relates to the field of pressure reducing valves, in particular to a pilot type proportional pressure reducing valve.

Background

The pilot-operated type pressure reducing valve is one of pressure reducing valves, is a safety valve, is usually closely matched with a component, generally adopts the opening degree of an opening and closing part in a control valve body cylinder to regulate the flow rate of a medium, reduces the pressure of the medium, simultaneously regulates the opening degree of the opening and closing part under the action of the pressure behind the valve, keeps the pressure behind the valve within a certain range, keeps the outlet pressure within a set range under the condition that the inlet pressure is continuously changed, and protects the subsequent life production appliances; the proportional pressure reducing valve has accurate proportion and stable work, and reduces both the pressure and the static pressure. The pressure behind the valve is changed by utilizing the pressure difference generated by different sectional areas at two ends of a piston in a valve body cylinder, so that the aim of reducing the pressure is fulfilled.

The pilot-operated proportional pressure reducing valve comprises a pressure regulating hand wheel, a spring and a valve cover, wherein the spring comprises a pressure regulating spring and a main valve spring, an adjusting screw is installed on the pressure regulating hand wheel, the adjusting screw is installed on the valve cover, the pressure regulating spring is arranged in the valve cover and connected with one end of the pilot valve, the other end of the pilot valve is fixedly provided with a pilot valve core, the pilot valve core is fixedly arranged on a pilot valve seat, the tail end of the pilot valve seat is provided with a remote control port, the lower end of the pilot valve seat is provided with an oil drainage port, the lower end of the valve cover is fixedly provided with a valve body, the main valve spring is arranged in the valve body, the lower end of the main valve spring is provided with an oil inlet, a main valve core is arranged on the oil inlet, a pressure reducing port is arranged on the main valve core, an oil outlet is arranged on one side of the pressure reducing port, a damping hole is arranged on one side of the lower end of the main valve core, and an end cover is arranged at the bottom of the main valve core.

In view of the above-mentioned related technologies, the inventor believes that the conventional pilot type proportional pressure reducing valve has a large volume and a long oil path, and has the defect that it is difficult to quickly balance the pressure in the valve and may damage components in the oil path.

SUMMERY OF THE UTILITY MODEL

To quickly equalize the pressure within the valve, the present application provides a pilot proportional pressure relief valve.

The application provides a guide's formula proportional pressure reducing valve adopts following technical scheme:

a pilot-operated proportional pressure reducing valve comprises a pressure reducing valve, a pilot valve, an electromagnet and a flow stabilizer, wherein the pilot valve is arranged on one side of the pressure reducing valve and used for controlling the pressure reducing valve to work, the electromagnet is arranged at one end, far away from the pressure reducing valve, of the pilot valve and used for controlling the pilot valve to work, and the flow stabilizer is arranged between the pressure reducing valve and the pilot valve and used for adjusting pressure;

the pressure reducing valve comprises a shell, a main oil duct is arranged in the center of the shell, a valve core which can move in a reciprocating mode along the axis of the length direction of the shell is arranged in the main oil duct, a pressure reducing spring is arranged at one end, far away from the current stabilizer, of the pressure reducing valve core, and a shell cover is arranged at one end, close to the pressure reducing spring, of the shell;

the shell is internally provided with four channels T, B, P and A for oil feeding and a U-shaped channel for pressure transformation, and when the pressure reducing valve core moves, different channels can be communicated according to different pressure transformation requirements; the P channel is communicated with the current stabilizer; the flow stabilizer comprises a flow stabilizing shell, a flow stabilizing valve core and a flow stabilizing spring, wherein the flow stabilizing valve core is arranged in the flow stabilizing shell, a cross-shaped channel is formed in the center of the flow stabilizing valve core, and the flow stabilizing spring is arranged at one end, far away from the P channel, of the flow stabilizing valve core.

By adopting the technical scheme, the system pressure in the A is adjusted by determining a certain set value through the electronic control unit. The electronic control unit controls the electromagnet according to a set value, modulates current by using an oscillation signal to obtain the minimum hysteresis quantity, converts the current into mechanical acting force by the electromagnet, and pre-tightens a main spring in the pilot stage through the armature push rod. The pressure in the valve body is adjusted through the flow stabilizer, and the cross-shaped oil way can enable oil to keep constant in pressure when the oil is used for adjusting the pressure, so that the effect of quickly adjusting the pressure in the valve is achieved.

Preferably, the flow stabilizing shell is of a solid structure, a flow stabilizing channel for the flow stabilizing valve core to reciprocate is formed in the flow stabilizing shell from one end of the flow stabilizing shell to the other end of the flow stabilizing shell, a step for mounting the flow stabilizing spring is arranged on one side, close to the bottom of the flow stabilizing channel, of the flow stabilizing valve core, one end of the flow stabilizing spring is fixedly connected with the flow stabilizing valve core, and one end, far away from the flow stabilizing valve core, of the flow stabilizing spring is fixedly connected with the bottom of the flow stabilizing channel.

By adopting the technical scheme, the steady flow spring can be compressed in the reciprocating movement process of the steady flow valve core, so that the switching state of the cross-shaped channel and other channels can be changed under the action of oil liquid with different pressures, the working conditions under different pressures can be adapted, and the purpose of pressure regulation can be further completed.

Preferably, the cross-shaped channel transverse channel penetrates through the flow stabilizing valve core and is communicated with the outside, the cross-shaped channel longitudinal channel is located at the center of the flow stabilizing valve core in the length direction, the longitudinal channel penetrates through the flow stabilizing valve core, the flow stabilizing shell is provided with an annular oil way communicated with the cross-shaped channel, and a flow stabilizing oil outlet is formed in one side, close to the pilot valve, of the annular oil way.

By adopting the technical scheme, whether the cross-shaped channel is communicated with the annular oil circuit through the steady flow spring is controlled, the principle is that when the pilot oil exerts pressure on the steady flow valve core to cause the steady flow valve core to compress the steady flow spring, the cross-shaped channel is disconnected with the annular oil circuit, and when the steady flow spring is restored, the cross-shaped channel is communicated with the annular oil circuit, and because the cross-shaped channel is positioned in the steady flow valve core, the oil circuit through which oil passes is reduced when pressure is changed, so that the purpose of quickly changing the pressure is achieved.

Preferably, the pilot valve is a cone valve, the pilot valve housing and the junction of electro-magnet has seted up the cavity, the pilot valve sets up in the cavity, the pilot valve include one end with the electro-magnet is connected, the other end is connected with the pilot spring of cone valve head, wherein, the pointed end orientation of cone valve head the current stabilizer, the current stabilizer with be provided with the pilot valve seat between the pilot valve.

Through adopting above-mentioned technical scheme, at the in-process of vary voltage, fluid can flow into the cavity, and the electro-magnet control guide spring to control the cone valve head and remove, the velocity of flow of control fluid, accomplish the vary voltage.

Preferably, a pilot valve flow passage is arranged at the center of the guide valve seat in the length direction, the pilot valve flow passage penetrates through the guide valve seat in the width direction and is communicated with the outside, a pilot oil path communicated with the pilot valve flow passage is formed in the pilot shell and is communicated with the current stabilizer, and the guide valve seat is detachably connected with the pilot shell.

By adopting the technical scheme, when different hydraulic mechanisms are used, the pilot valve seats of different models can be used as required, and initially, oil can flow into the pilot valve oil duct through the duct method flow passage, so that the pressure is applied to the cone valve head, and the oil path is changed.

Preferably, the pressure reducing valve is communicated with the A-T channel at the initial position, the P-A channel is in a closed state at the moment, and when the pressure of the A channel needs to be adjusted, pilot oil introduced from the P channel acts on a valve core of the pressure reducing valve to enable the pressure reducing valve core to be movably communicated with the P-A channel.

By adopting the technical scheme, when the valve is at the initial position, the main valve core closes P-A and communicates A-T under the action of the spring. When the valve works, pilot oil flows through the P port and acts on the right end of the main valve core through the flow stabilizer, the main valve core rapidly moves to the left under the action of the pilot oil, the P-A is communicated, and the A-T is closed. The oil at the A port acts on the left end of the valve core through the throttling hole of the main valve core and balances the acting force of the electromagnet pushing the pilot cone valve with the spring, so that the preset pressure is obtained. When the pressure of the port A continuously increases and exceeds the preset pressure, the valve core moves to the right to be communicated with the port A-T, and overvoltage protection is realized.

Preferably, the reducing valve, the pilot valve, the electromagnet and the joints between the pilot valve seat and all the internal oil passages are provided with sealing rings.

Through adopting above-mentioned technical scheme, the effect of sealing washer is the leakage of avoiding fluid.

Preferably, an exhaust port is arranged at one end, far away from the pilot valve, of the electromagnet.

Through adopting above-mentioned technical scheme, be full of hydraulic oil when the inner chamber of electro-magnet to when connecting through T, can exhaust through the spiral stopper.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the system pressure in a is adjusted by the electronic control unit determining a certain set point. The electronic control unit controls the electromagnet according to a set value, modulates current by using an oscillation signal to obtain the minimum hysteresis quantity, converts the current into mechanical acting force by the electromagnet, and pre-tightens a main spring in the pilot stage through the armature push rod. The pressure in the valve body is adjusted through the flow stabilizer, and the cross-shaped oil way can enable oil to keep constant in pressure when the oil is used for adjusting the pressure, so that the effect of quickly adjusting the pressure in the valve is achieved.

2. The cross-shaped channel is controlled to be communicated with the annular oil circuit through the flow stabilizing spring, and the principle is that when the pilot oil exerts pressure on the flow stabilizing valve core to cause the flow stabilizing valve core to compress the flow stabilizing spring, the cross-shaped channel is disconnected with the annular oil circuit, and when the flow stabilizing spring is restored, the cross-shaped channel is communicated with the annular oil circuit, so that the oil circuit through which oil passes is reduced when pressure is changed due to the fact that the cross-shaped channel is located in the flow stabilizing valve core, and the purpose of rapid pressure change is achieved.

3. When the valve is at the initial position, the main valve core closes P-A and communicates A-T under the action of the spring. When the valve works, pilot oil flows through the P port and acts on the right end of the main valve core through the flow stabilizer, the main valve core rapidly moves to the left under the action of the pilot oil, the P-A is communicated, and the A-T is closed. The oil of the port A acts on the left end of the valve core through the throttling hole of the main valve core, and balances the acting force of the electromagnet for pushing the pilot cone valve together with the spring, so that the preset pressure is obtained. When the pressure of the port A continuously increases and exceeds the preset pressure, the valve core moves to the right to be communicated with the port A-T, and overvoltage protection is realized.

Drawings

FIG. 1 is a schematic cross-sectional view of a pilot-operated proportional pressure reducing valve according to an embodiment of the present disclosure;

fig. 2 is a partially enlarged schematic view showing a part a of the structure.

Description of reference numerals: 1. a pressure reducing valve; 11. a housing; 12. a shell cover; 13. a pressure reducing valve core; 14. a U-shaped channel; 15. a first return channel; 16. a second return channel; 17. a relief spring; 2. a pilot valve; 21. a pilot housing; 22. a conical valve head; 23. a pilot valve oil passage; 24. a pilot oil path; 25. a pilot spring; 3. a current stabilizer; 31. a flow stabilizing shell; 32. a flow stabilizing valve core; 33. a steady flow spring; 34. a steady flow oil inlet channel; 35. a steady flow oil outlet channel; 36. a flow stabilizing channel; 37. a transverse channel; 38. a longitudinal channel; 39. an annular oil passage; 4. an electromagnet; 41. an exhaust port; 5. a guide valve seat; 51. a pilot valve flow passage; 6. and (5) sealing rings.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a pilot-operated proportional pressure reducing valve. Referring to fig. 1, the pilot type proportional pressure reducing valve includes a pressure reducing valve 1, a pilot valve 2 provided at one side of the pressure reducing valve 1 for controlling the operation of the pressure reducing valve 1, an electromagnet 4 provided at one side of the pilot valve 2 remote from the pressure reducing valve 1 for controlling the operation of the pilot valve 2, and a current stabilizer 3 installed between the pressure reducing valve 1 and the pilot valve 2.

Referring to fig. 1, the pressure reducing valve 1 includes a solid housing 11, a housing cover 12 provided on an end of the housing 11 away from the pilot valve 2, and a pressure reducing valve spool 13 provided at the center inside the housing 11 along the length direction of the housing 11. The main oil duct is arranged at the center of the inside of the shell 11 along the length direction of the shell 11, the pressure reducing valve core 13 reciprocates in the main oil duct, the main oil duct penetrates through the whole pressure reducing valve core 13, two sides of the width direction of the main oil duct in the shell 11 are respectively provided with a U-shaped channel 14 and four channels T, B, P and A used for oil running, wherein the U-shaped channel 14 is provided with a first return channel 15 communicated with the pilot valve 2, and the P-shaped channel is provided with a second return channel 16 communicated with the flow stabilizer 3.

Referring to fig. 1, when the pressure relief valve is used, no matter the A-T channel is communicated or the P-A channel is communicated, the middle of the pressure relief valve needs to be communicated by means of the U-shaped channel 14, when the oil liquid reaches the flow stabilizer 3 through the P-shaped channel and the second return channel 16 at the initial position, the A-T channel is communicated, when the oil liquid reaches the pilot valve 2, the pressure relief valve core 13 is controlled to move leftwards, the pressure relief valve core 13 closes the A-T channel and is communicated with the P-A channel, and when the pressure of the A channel continuously increases and exceeds the preset pressure, the pressure relief valve core 13 moves rightwards to communicate the A-T channel, and overpressure protection is achieved. One end of the pressure reducing valve core 13 close to the shell cover 12 is provided with a pressure reducing spring 17, one end of the pressure reducing spring 17 is fixedly connected with the pressure reducing valve core 13, one end of the pressure reducing spring 17 far away from the pressure reducing valve core 13 is connected with the bottom of the shell cover 12, and a space for installing the pressure reducing spring 17 is arranged between the shell 11 and the shell cover 12.

Referring to fig. 2, the flow stabilizer 3 includes a flow stabilizer case 31, a flow stabilizer core disposed in the flow stabilizer case 31, and a flow stabilizer spring 33 disposed at one end of the flow stabilizer core. The steady flow shell 31 is of a solid structure, one end of the steady flow shell 31 is provided with a steady flow oil inlet channel 34 which is coaxial and communicated with the second return channel 16, one end, far away from the second return channel 16, of the steady flow oil inlet channel 34 is communicated with a steady flow valve core, a steady flow oil outlet channel 35 is arranged at a position parallel to the steady flow oil inlet channel 34, one end of the steady flow oil outlet channel 35 is communicated with the steady flow oil inlet channel 34 through the steady flow valve core, and one end, far away from the steady flow oil inlet channel 34, of the steady flow oil outlet channel 35 is communicated with the pilot valve 2.

Referring to fig. 2, a steady flow channel 36 for the steady flow valve core to reciprocate is formed in the center of the steady flow valve core along the length direction of the steady flow valve core, the steady flow channel 36 is communicated with a steady flow oil inlet channel 34, a step for mounting a steady flow spring 33 is arranged at one end of the steady flow valve core far away from the steady flow oil inlet channel 34, one end of the steady flow spring 33 is fixedly connected with the steady flow valve core, one end of the steady flow spring 33 far away from the steady flow valve core is fixedly connected with the bottom of the steady flow channel 36, a cross-shaped channel is formed in the center of the steady flow valve core, the cross-shaped channel is formed by a transverse channel 37 and a longitudinal channel 38, the longitudinal channel is formed along the length direction of the steady flow valve core, the transverse channel 37 is perpendicular to the longitudinal channel, and the steady flow oil inlet channel 34 is communicated with the steady flow oil outlet channel 35 through the transverse channel 37.

Referring to fig. 2, an annular oil path 39 is formed in the flow stabilizing housing 31, when the flow stabilizing spring 33 is in the original state, the annular oil path 39 is communicated with the transverse channel 37, and a flow stabilizing oil outlet is formed in one side, close to the flow stabilizing oil outlet channel 35, of the annular channel, so that oil in the flow stabilizing valve core can flow through the annular oil path 39, and rapid pressure reduction is achieved by shortening the oil path.

Referring to fig. 1, the pilot valve 2 includes a pilot housing 21 and a cone valve head 22, the pilot housing 21 is a solid structure, a main flow passage communicated with the main oil passage, a pilot oil passage 23 communicating the main flow passage with the first return flow passage 15, and a pilot oil passage 24 communicating the steady flow oil passage 35 with the main flow passage are formed in the center of the pilot housing 21. The connection part of the pilot housing 21 and the electromagnet 4 is provided with a cavity, the cone valve head 22 is installed in the cavity, the bottom of the cone valve head 22 is provided with a pilot spring 25, one end of the pilot spring is connected with the bottom of the cone valve head 22, the other end of the pilot spring is fixedly connected with the electromagnet 4, the tip end of the cone valve head 22 faces the current stabilizer 3, and a pilot valve seat 5 is arranged between the current stabilizer 3 and the cone valve head 22.

Referring to fig. 1, a pilot valve flow passage 51 is disposed at the center of a pilot valve seat 5 in the length direction, the pilot valve flow passage 51 penetrates through the width direction of the pilot valve seat 5 to be communicated with a pilot oil passage 24, the pilot valve seat 5 and a pilot housing 21 are detachably connected, when different hydraulic mechanisms are used, different types of pilot valve seats 5 can be used as required, and initially, oil can flow into the pilot valve flow passage 51 through a channel method flow passage, so that a cone valve head 22 is pressed, and an oil path is changed.

Referring to fig. 1, an exhaust port 41 is provided at an end of the electromagnet 4 away from the pilot valve 2, and when the inner cavity of the electromagnet 4 is filled with hydraulic oil and connected through T, exhaust can be performed through a screw plug. In the pilot type proportional pressure reducing valve 1, a sealing ring 6 is arranged at the joint of each oil path.

The implementation principle of the embodiment of the application is as follows: the system pressure in a is adjusted by the electronic control unit determining a certain set point. The electronic control unit controls the electromagnet 4 according to a set value, modulates the current by using an oscillation signal to obtain the minimum hysteresis quantity, converts the current into mechanical acting force by the electromagnet 4, and pre-tensions a main spring in a pilot stage through an armature push rod. The pressure in the valve body is adjusted through the flow stabilizer 3, and the cross-shaped oil way can enable oil to keep the pressure constant while the oil way is shortest when the pressure is adjusted by the oil, so that the effect of quickly adjusting the pressure in the valve is achieved.

When the valve is in the initial position, the pressure reducing valve core 13 closes P-A and communicates A-T under the action of the pressure reducing spring 17. When the pilot-operated valve works, pilot oil flows through the P port and the flow stabilizer 3 to act on the right end of the pilot valve 2 core and the conical valve head 22 opposite to the seat of the pilot valve 2 respectively. At the moment, the pressure reducing valve core 13 moves left rapidly under the action of pilot oil, and is communicated with P-A and closed from A-T. The oil from port A passes through the pressure reducing valve core 13, and the left end of the pressure reducing valve core 13 balances the acting force of the electromagnet 4 pushing the conical valve head 22 together with the pressure reducing spring 17, so that the preset pressure is obtained. When the pressure of the port A continuously increases and exceeds the preset pressure, the pressure reducing valve core 13 moves rightwards to be communicated with the port A-T. And overvoltage protection is realized. If a fault occurs in the electronic control unit, overvoltage protection is achieved mainly by the maximum spring force of the springs, such as the pressure-reducing spring 17, the flow-stabilizing spring 33, the pilot spring 25, etc.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A pilot-operated proportional pressure reducing valve, characterized by: the pressure-reducing valve comprises a pressure-reducing valve (1), a pilot valve (2) arranged on one side of the pressure-reducing valve (1) and used for controlling the pressure-reducing valve (1) to work, an electromagnet (4) arranged at one end, far away from the pressure-reducing valve (1), of the pilot valve (2) and used for controlling the pilot valve (2) to use, and a current stabilizer (3) arranged between the pressure-reducing valve (1) and the pilot valve (2) and used for adjusting pressure;

the pressure reducing valve (1) comprises a shell (11), a main oil duct is arranged in the center of the shell (11), a pressure reducing valve core (13) which moves in a reciprocating mode along the axis of the length direction of the shell (11) is arranged in the main oil duct, a pressure reducing spring (17) is arranged at one end, far away from the current stabilizer (3), of the pressure reducing valve core (13), and a shell cover (12) is arranged at one end, close to the pressure reducing spring (17), of the shell (11);

four channels for oil to flow and a U-shaped channel (14) for pressure change are arranged in the shell (11), and when the pressure reducing valve core (13) moves, different channels can be communicated according to different pressure change requirements; the P channel is communicated with the current stabilizer (3); the flow stabilizer (3) comprises a flow stabilizing shell (31), a flow stabilizing valve core (32) arranged in the flow stabilizing shell (31), a cross-shaped channel is arranged at the center of the flow stabilizing valve core (32), and the flow stabilizer further comprises a flow stabilizing spring (33), wherein the flow stabilizing spring (33) is arranged at one end, far away from the P channel, of the flow stabilizing valve core (32).

2. The pilot-operated proportional pressure reducing valve as defined in claim 1, wherein: the flow stabilizing device is characterized in that the flow stabilizing shell (31) is of a solid structure, a flow stabilizing channel (36) capable of supplying reciprocating motion of the flow stabilizing valve core (32) is arranged in the flow stabilizing shell (31) from one end of the flow stabilizing shell (31) to the other end, one side, close to the bottom of the flow stabilizing valve core (32), of the flow stabilizing valve core (32) is provided with a step capable of being provided with the flow stabilizing spring (33), one end of the flow stabilizing spring (33) is fixedly connected with the flow stabilizing valve core (32), and one end, far away from the flow stabilizing valve core (32), of the flow stabilizing spring (33) is fixedly connected with the bottom of the flow stabilizing channel (36).

3. The pilot-operated proportional pressure reducing valve as claimed in claim 2, wherein: cross-shaped channel's cross passageway (37) run through current-stabilizing valve core (32) and outside intercommunication, cross-shaped channel's longitudinal channel (38) are located current-stabilizing valve core (32)'s length direction's center department, just longitudinal channel runs through current-stabilizing valve core (32), seted up on stationary flow shell (31) with annular oil circuit (39) of cross-shaped channel (37) intercommunication, annular oil circuit (39) are close to the stationary flow oil-out has been seted up to one side of pilot valve (2).

4. The pilot operated proportional pressure reducing valve according to claim 1, wherein: the pilot valve (2) includes pilot operated shell (21) and awl valve head (22), pilot operated shell (21) with the cavity has been seted up to the junction of electro-magnet (4), pilot operated valve (2) set up in the cavity, pilot operated valve (2) include one end with electro-magnet (4) are connected, the other end is connected with pilot spring (25) of awl valve head (22), wherein, the pointed end orientation of awl valve head (22) current stabilizer (3), current stabilizer (3) with be provided with between pilot operated valve (2) and lead valve seat (5).

5. The pilot-operated proportional pressure reducing valve as claimed in claim 4, wherein: the center of the length direction of the guide valve seat (5) is provided with a guide valve flow passage (51), the guide valve flow passage (51) penetrates through the width direction of the guide valve seat (5) and is communicated with the outside, a guide oil path (24) communicated with the guide valve flow passage (51) is formed in the guide shell (21), the guide oil path (24) is communicated with the current stabilizer (3), and the guide valve seat (5) is detachably connected with the guide shell (21).

6. The pilot-operated proportional pressure reducing valve as defined in claim 1, wherein: when the pressure of the channel A needs to be adjusted, pilot oil introduced from the channel P acts on a valve core of the pressure reducing valve (1) to enable a pressure reducing valve core (13) to movably communicate with the channel P-A.

7. The pilot-operated proportional pressure reducing valve as defined in claim 5, wherein: and sealing rings (6) are arranged at the joints of the reducing valve (1), the pilot valve (2), the electromagnet (4) and all the internal oil ways between the pilot valve seats (5).

8. The pilot operated proportional pressure reducing valve according to claim 1, wherein: and an exhaust port (41) is formed in one end, far away from the pilot valve (2), of the electromagnet (4).