Hand-operated pile-up valve integrating cut-off reversing and synchronous double-proportion pressure reduction

Abstract

A manual integrated valve integrating cut-off reversing and synchronous double-proportion pressure reduction comprises a synchronous double-proportion pressure reduction valve, a manual cut-off reversing valve, an electromagnetic reversing valve and a manual command valve, the synchronous double-proportion pressure reduction valve and the manual command valve share a main valve body, the manual cut-off reversing valve is installed on the main valve body, and the electromagnetic reversing valve is installed on the synchronous double-proportion pressure reduction valve. And the electromagnetic reversing valve is inserted into the main valve body. By means of high integration, fluid pipelines among all elements are integrated, only external connectors are reserved, leakage points and occupied space are greatly reduced, and reliability is improved; and meanwhile, through integration, the integrated valve has the functions of stopping and reversing, two-stage amplification of control force, synchronous output of two-path proportional decompression pressure and pressure isolation and recovery, and can be suitable for deceleration braking of heavy vehicles.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control devices, in particular to a manual integrated valve integrating stop commutation and synchronous double-proportion decompression. Background Technique

[0002] At present, pressure reducing valves are widely used as pressure control elements in fluid systems. They have a single function and are mostly used at a single stage. Even when used at multiple stages, each component is installed and used in a relatively scattered manner, that is, each component is connected by pipelines. Such pressure reducing valves are simple to manufacture, but the pipelines are complex, the volume is large, there are many leakage points, the reliability is low, and the function is single, which is not suitable for various complex working conditions. Content of the Utility Model

[0003] The technical problem solved by the utility model is to provide a manual integrated valve integrating stop commutation and synchronous double-proportion decompression to solve the problems in the above background technique.

[0004] The technical problem solved by the utility model is realized by adopting the following technical solutions:

[0005] A manual integrated valve integrating stop commutation and synchronous double-proportion decompression includes a synchronous double-proportion pressure reducing valve, a manual stop commutation valve, an electromagnetic commutation valve and a manual command valve. Among them, the synchronous double-proportion pressure reducing valve and the manual command valve share a main valve body. The manual stop commutation valve is installed on the main valve body, and the electromagnetic commutation valve is inserted into the main valve body. The specific structures of each part are as follows:

[0006] The synchronous double-proportion pressure reducing valve includes a synchronous rear end cover, a synchronous small spring, a main valve body, a synchronous first valve core, a synchronous second valve core, a synchronous large spring, a spring shoulder, a rectangular spring, a spring cover, a piston, a plug and a synchronous front end cover. Among them, the synchronous first valve core and the synchronous second valve core are installed in the upper part of the main valve body. The synchronous rear end cover is installed at the rear end of the upper part of the main valve body, and the synchronous front end cover is installed at the front end of the upper part of the main valve body. And a synchronous first feedback cavity is formed between the synchronous rear end cover, the main valve body and the synchronous first valve core, and a synchronous second feedback cavity is formed between the synchronous first valve core, the synchronous second valve core and the main valve body. The synchronous small spring is installed in the synchronous rear end cover. A plug is installed in the synchronous front end cover. The plug is connected with the piston. The piston is connected with the spring cover. The rectangular spring, the spring shoulder and the synchronous large spring are installed in the spring cover. The synchronous small spring is connected with the synchronous first valve core. The synchronous first valve core is connected with the synchronous second valve core. The synchronous second valve core is connected with the synchronous large spring;

[0007] The manual cut-off reversing valve includes a cut-off rear end cover, a cut-off small spring, a cut-off reversing valve spool, a cut-off reversing valve body, a cut-off front end cover, and a cut-off manual operating mechanism. Among them, the cut-off reversing valve spool is arranged inside the cut-off reversing valve body. The cut-off front end cover is installed at the front end of the cut-off reversing valve body, and the cut-off rear end cover is installed at the rear end of the cut-off reversing valve body. The cut-off small spring is installed inside the cut-off rear end cover and is connected to the cut-off reversing valve spool. The cut-off reversing valve spool passes through the cut-off rear end cover and is connected to the cut-off manual operating mechanism. At the same time, a cut-off pressure input port and a cut-off pressure output port are provided on the cut-off reversing valve body.

[0008] The manual command valve includes a main valve body, a spring shoulder, a rectangular spring, a spring cover, a manual operating mechanism, a plunger, a manual front end cover, a manual large spring, a manual spool, a manual small spring, and a manual rear end cover. Among them, the manual spool is arranged at the lower part inside the main valve body. The manual front end cover is installed at the front end of the lower part inside the main valve body, and the manual rear end cover is installed at the rear end of the lower part inside the main valve body. A manual feedback cavity is formed between the manual rear end cover, the main valve body, and the manual spool. The manual small spring is installed inside the manual rear end cover. The spring cover is installed inside the manual front end cover, and the rectangular spring, the manual large spring, and the spring shoulder are installed inside the spring cover. The manual small spring is connected to one end of the manual spool, and the manual large spring is connected to the other end of the manual spool. The manual spool passes through the manual front end cover and is connected to the plunger, and the plunger is connected to the manual operating mechanism.

[0009] A pressure input port, a first pressure reducing output port, a second pressure reducing output port, an oil return port, and a command pressure port are provided on the main valve body for external connection.

[0010] In the present utility model, the manual operating mechanism is connected to the deceleration braking foot pedal through a connecting rod structure, the cut-off manual operating mechanism is connected to the parking handle through a connecting rod mechanism. The first pressure reducing output port and the second pressure reducing output port are connected to the braking system, and the cut-off pressure output port is connected to the parking brake port of the vehicle. The pressure input port and the cut-off pressure input port are connected to the pressure source, and the command pressure port is connected to the pressure gauge.

[0011] In the present utility model, a flow channel for communicating the manual feedback cavity with the command pressure port is provided inside the manual spool.

[0012] In the present utility model, a flow channel for communicating the synchronous first feedback cavity with the first pressure reducing output port and a flow channel for communicating the synchronous second feedback cavity with the second pressure reducing output port are provided inside the synchronous first spool.

[0013] Advantageous effects: Through highly integration, the present utility model integrates the fluid pipelines between various components into one body, leaving only external interfaces, greatly reducing the leakage points and occupied space, and improving the reliability. At the same time, through integration, the integrated valve has the following functions: 1. Cut-off and reversing; 2. Two-stage amplification of control force; 3. Synchronously output two-way proportional pressure reducing pressures; 4. Pressure isolation and restoration, and it can be applied to the deceleration braking of heavy vehicles. Brief Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present utility model.

[0015] Figure 2 It is a schematic structural diagram of a synchronous double-proportion pressure reducing valve and a hand-operated command valve in a preferred embodiment of the present utility model.

[0016] Figure 3 It is a schematic structural diagram of a hand-operated stop and reversing valve in a preferred embodiment of the present utility model.

[0017] Figure 4 It is a three-dimensional view of a preferred embodiment of the present utility model.

[0018] Figure 5 It is a schematic diagram of the principle of a preferred embodiment of the present utility model. Detailed Description of the Preferred Embodiment

[0019] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0020] Refer to Figures 1 to 5 A hand-operated integrated valve that integrates stop and reversing and synchronous double-proportion pressure reduction, including a synchronous double-proportion pressure reducing valve 1, a hand-operated stop and reversing valve 2, an electromagnetic reversing valve 3, a hand-operated command valve 4, a synchronous rear end cover 5, a synchronous small spring 6, a main valve body 7, a synchronous first valve core 8, a synchronous second valve core 9, a synchronous large spring 10, a spring shoulder 11, a rectangular spring 12, a spring cover 13, a piston 14, a plug 15, a synchronous front end cover 16, a hand-operating mechanism 17, a plunger 18, a hand-operated front end cover 19, a hand-operated large spring 20, a hand-operated valve core 21, a hand-operated small spring 22, a hand-operated rear end cover 23, a stop rear end cover 24, a stop small spring 25, a stop and reversing valve core 26, a stop and reversing valve body 27, a stop front end cover 28, a stop hand-operating mechanism 29. Among them, the synchronous double-proportion pressure reducing valve 1 and the hand-operated command valve 4 share a main valve body 7, the hand-operated stop and reversing valve 2 is installed on the main valve body 7, the electromagnetic reversing valve 3 is inserted into the main valve body 7, and the specific structures of each part are as follows:

[0021] The synchronous double proportional pressure reducing valve 1 is used to receive the command pressure and synchronously output two-way pressure reducing outputs proportional to the command pressure. It includes a synchronous rear end cover 5, a synchronous small spring 6, a main valve body 7, a synchronous first valve core 8, a synchronous second valve core 9, a synchronous large spring 10, a spring shoulder 11, a rectangular spring 12, a spring cover 13, a piston 14, a plug 15 and a synchronous front end cover 16. Among them, the synchronous first valve core 8 and the synchronous second valve core 9 are installed in the upper part of the main valve body 7. The synchronous rear end cover 5 is installed at the rear end of the upper part of the main valve body 7, and the synchronous front end cover 16 is installed at the front end of the upper part of the main valve body 7. A synchronous first feedback cavity is formed between the synchronous rear end cover 5, the main valve body 7 and the synchronous first valve core 8, and a synchronous second feedback cavity is formed between the synchronous first valve core 8, the synchronous second valve core 9 and the main valve body 7. A flow channel is provided inside the synchronous first valve core 8 to connect the synchronous first feedback cavity with the first pressure reducing output port 34, and a flow channel is inside the synchronous first valve core 8 to connect the synchronous second feedback cavity with the second pressure reducing output port 35. The synchronous small spring 6 is installed inside the synchronous rear end cover 5. A plug 15 is installed inside the synchronous front end cover 16. The plug 15 is connected to the piston 14, the piston 14 is connected to the spring cover 13, and the rectangular spring 12, the spring shoulder 11 and the synchronous large spring 10 are installed inside the spring cover 13. The synchronous small spring 6 is connected to the synchronous first valve core 8, the synchronous first valve core 8 is connected to the synchronous second valve core 9, and the synchronous second valve core 9 is connected to the synchronous large spring 10.

[0022] The hand-operated stop reversing valve 2 is used for manual control of stopping or reversing and outputs the same pressure as the pressure input port 36. It includes a stop rear end cover 24, a stop small spring 25, a stop reversing valve core 26, a stop reversing valve body 27, a stop front end cover 28 and a stop hand-operating mechanism 29. Among them, the stop reversing valve core 26 is arranged inside the stop reversing valve body 27. The stop front end cover 28 is installed at the front end of the stop reversing valve body 27, and the stop rear end cover 24 is installed at the rear end of the stop reversing valve body 27. The stop small spring 25 is installed inside the stop rear end cover 24. The stop small spring 25 is connected to the stop reversing valve core 26, and the stop reversing valve core 26 passes through the stop rear end cover 24 and is connected to the stop hand-operating mechanism 29. At the same time, a stop pressure input port 32 and a stop pressure output port 36 are provided on the stop reversing valve body 27 for external connection.

[0023] The electromagnetic reversing valve 3 is used to transmit the command pressure for isolation and restoration of the synchronous double proportional pressure reducing valve 1.

[0024] The manual command valve 4 is used to connect with an external mechanism and output a command pressure proportional to the operating force acting on the lever, including a main valve body 7, a spring shoulder 11, a rectangular spring 12, a spring cover 13, a manual operating mechanism 17, a plunger 18, a manual operating front end cover 19, a manual operating large spring 20, a manual operating valve core 21, a manual operating small spring 22, and a manual operating rear end cover 23. Among them, the manual operating valve core 21 is arranged at the lower part inside the main valve body 7. The manual operating front end cover 19 is installed at the front end of the lower part inside the main valve body 7, and the manual operating rear end cover 23 is installed at the rear end of the lower part inside the main valve body 7. A manual operating feedback chamber is formed between the manual operating rear end cover 23, the main valve body 7, and the manual operating valve core 21. The manual operating small spring 22 is installed inside the manual operating rear end cover 23, and the spring cover 13 is installed inside the manual operating front end cover 19. The rectangular spring 12, the manual operating large spring 20, and the spring shoulder 11 are installed inside the spring cover 13. One end of the manual operating small spring 22 is connected to the manual operating valve core 21, and the other end of the manual operating large spring 20 is connected to the manual operating valve core 21. The manual operating valve core 21 passes through the manual operating front end cover 19 and is connected to the plunger 18, and the plunger 18 is connected to the manual operating mechanism 17. There is a flow channel inside the manual operating valve core 21 to connect the manual operating feedback chamber with the command pressure port 33.

[0025] The main valve body 7 is provided with a pressure input port 31, a first pressure reducing output port 34, a second pressure reducing output port 35, an oil return port 30, and a command pressure port 33 for external connection. The main valve body 7 serves as the installation base for each component and has a fluid channel inside to connect each hydraulic component. Its hydraulic principle is as Figure 5 shown.

[0026] In this embodiment, the manual operating mechanism 17 is connected to the deceleration braking foot pedal through a link structure, and the cut-off manual operating mechanism 29 is connected to the parking handle through a link mechanism. The first pressure reducing output port 34 and the second pressure reducing output port 35 are connected to the braking system, and the cut-off pressure output port 36 is connected to the parking brake port of the vehicle; the pressure input port 31 and the cut-off pressure input port 32 are connected to the pressure source, and the command pressure port 33 is connected to the pressure gauge.

[0027] In the initial position, the manual operating mechanism 17 and the cut-off manual operating mechanism 29 are not subject to external forces. Under the action of the manual operating small spring 22, the manual operating valve core 21 isolates the command pressure port 33 from the pressure input port 31, and then connects it to the oil return port 30, and the command pressure is zero.

[0028] Under the action of the synchronous small spring 6, the synchronous first valve core 8 and the synchronous second valve core 9 isolate the first pressure reducing output port 34 from the pressure input port 31, and then connect it to the oil return port 30, and the pressure of the first pressure reducing output port 34 is zero.

[0029] The second pressure reducing output port 35 is isolated from the pressure input port 31 and connected to the oil return port 30, and the pressure of the second pressure reducing output port 35 is zero.

[0030] The cut-off reversing valve spool 26 isolates the cut-off pressure output port 36 from the cut-off pressure input port 32 under the action of the cut-off small spring 25, and then communicates with the oil return port 30. The pressure of the cut-off pressure output port 36 is zero, and the vehicle runs normally.

[0031] When the vehicle needs to decelerate, the driver increases the force applied to the manual operating mechanism 17. The manual operating mechanism 17 moves the plunger 18 and the spring cover 13 to the left, thereby compressing the rectangular spring 12 and the manual operating large spring 20, and synchronously moving the spring flat shoulder 11 and the manual operating spool 21 to the left, thereby isolating the command pressure port 33 from the oil return port 30. When the pressure input port 31 communicates with the command pressure port 33, the command pressure port 33 starts to output pressure and feeds the pressure back to the manual operating feedback chamber. When the pressure in the manual operating feedback chamber reaches the set value, the pressure in the manual operating feedback chamber moves the manual operating spool 21 to the right, isolating the command pressure port 33 from the pressure input port 31 and compressing the rectangular spring 12. At this time, the system is balanced and a stable command pressure is output. The command pressure increases as the force on the manual operating mechanism 17 increases.

[0032] The command pressure reaches the control chamber at the right end of the piston 14 through the internal flow passage of the main valve body 7, pushing the piston 14 and the spring cover 13 to the left, compressing the rectangular spring 12 and the manual operating small spring 22, and moving the cut-off manual operating mechanism 29 and the synchronous first spool 8 to the left, isolating the second pressure reducing output port 35 and the first pressure reducing output port 34 from the oil return port 30. When the pressure input port 31 communicates with the cut-off pressure input port 32, the second pressure reducing output port 35 starts to output pressure and feeds the pressure back to the synchronous second feedback chamber, further pushing the synchronous first spool 8 to the left. When the pressure in the synchronous second feedback chamber reaches the set value, the pressure in the synchronous second feedback chamber moves the synchronous second spool 9 to the right, isolating the second pressure reducing output port 35 from the pressure input port 31 and compressing the rectangular spring 12. At this time, the second pressure reducing output port 35 outputs a stable pressure reducing pressure.

[0033] At the same time, the pressure in the synchronous second feedback chamber pushes the synchronous first spool 8 to the left. When the pressure input port 31 communicates with the second pressure reducing output port 35, the second pressure reducing output port 35 starts to output pressure and feeds the pressure back to the synchronous first feedback chamber. When the pressure in the synchronous first feedback chamber reaches the set value, the pressure in the synchronous first feedback chamber moves the synchronous first spool 8 to the right, isolating the second pressure reducing output port 35 from the pressure input port 31. At this time, the second pressure reducing output port 35 outputs a stable pressure reducing pressure.

[0034] The pressure reducing pressures of the two pressure reducing output ports increase as the command pressure increases. The two pressure reducing output ports output the pressure reducing pressure to the braking system of the vehicle, so that the vehicle can decelerate.

[0035] When the vehicle needs to remove deceleration, the driver reduces the force applied to the manual operating mechanism 17. The pressure in the manual operation feedback chamber pushes the manual operation spool 21, spring shoulder 11, spring cover 13, and plunger 18 to move to the right, and releases the rectangular spring 12 and the manual operation large spring 20. When the command pressure port 33 is connected to the oil return port 30, the command pressure port 33 starts to reduce the output command pressure and feeds the pressure back to the manual operation feedback chamber. When the pressure in the feedback chamber 3 reaches the set value, the rectangular spring 12 releases and pushes the manual operation spool 21 to the left. At this time, the command pressure port 33 is isolated from the oil return port 30, and the system rebalances to output a stable command pressure. At this time, the command pressure decreases with the decrease of the operating force.

[0036] When the command pressure decreases, it reaches the control chamber at the right end of the piston 14 through the internal flow passage in the main valve body 7. The pressure in the synchronization second feedback chamber pushes the synchronization second spool 9, spring shoulder 17, spring cover 13, and piston 14 to move to the right, and releases the rectangular spring 12 and the synchronization large spring 10. When the second pressure reducing output port 35 is connected to the oil return port 30, the second pressure reducing output port 35 starts to reduce the output pressure reducing pressure and feeds the pressure back to the synchronization second feedback chamber. When the pressure in the synchronization second feedback chamber reaches the set value, the rectangular spring 12 releases and pushes the synchronization second spool 9 to the left. At this time, the second pressure reducing output port 35 is isolated from the oil return port 30, and the system rebalances to output a stable pressure reducing pressure. At this time, the pressure reducing pressure decreases with the decrease of the command pressure.

[0037] At the same time, the pressure in the manual operation feedback chamber pushes the synchronization first spool 8 to move to the right. When the oil return port 30 is connected to the first pressure reducing output port 34, the first pressure reducing output port 34 starts to reduce the pressure reducing output pressure and feeds the pressure back to the synchronization first feedback chamber. When the pressure in the synchronization first feedback chamber reaches the set value, the pressure in the synchronization second feedback chamber pushes the synchronization first spool 8 to move to the right, isolating the first pressure reducing output port 34 from the oil return port 30. At this time, a stable pressure reducing pressure is output from the first pressure reducing output port 34, and the pressure reducing pressures output from the two pressure reducing output ports are reduced to the braking system of the vehicle, thereby removing the deceleration of the vehicle.

[0038] In this embodiment, a redundant design with two independent pressure reducing output pressures is set to ensure the reliability of the braking system. When a command pressure failure occurs, the output of the command pressure can be isolated through the electromagnetic directional valve 3 to ensure the normal driving of the vehicle. When the vehicle needs to park, the driver operates the cut-off manual operating mechanism 29 through the parking handle, pushing the cut-off directional valve spool 26 to connect the cut-off pressure input port 32 with the cut-off pressure output port 36, isolating the cut-off pressure input port 32 from the oil return port 30, and the pressure output port 36 outputs the parking pressure to park the vehicle.

[0039] When the vehicle needs to travel, the force on the cut-off manual mechanism 29 is removed, and the cut-off small spring 25 pushes the cut-off reversing valve spool 26 to reset. The cut-off pressure input port 32 is isolated from the cut-off pressure output port 36, and the cut-off pressure input port 32 is communicated with the oil return port 30, and the vehicle resumes traveling.

[0040] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A hand-operated integrated valve with integrated shut-off reversing and synchronous dual-proportional pressure reduction, comprising a synchronous dual-proportional pressure reducing valve, a hand-operated shut-off reversing valve, an electromagnetic reversing valve and a hand-operated command valve, characterized in that: The synchronous dual-proportional pressure reducing valve and the manual command valve share a main valve body. The manual stop reversing valve is installed on the main valve body, and the solenoid reversing valve is inserted in the main valve body. The specific structure of each part is as follows: The synchronous dual-proportional pressure reducing valve comprises a synchronous rear end cover, a synchronous small spring, a main valve body, a synchronous valve core No. 1, a synchronous valve core No. 2, a synchronous large spring, a spring flat shoulder, a rectangular spring, a spring cover, a piston, a plug and a synchronous front end cover, wherein a synchronous valve core No. 1 and a synchronous valve core No. 2 are installed in the upper part of the main valve body, the synchronous rear end cover is installed in the upper rear end of the main valve body, and the synchronous front end cover is installed in the upper front end of the main valve body; and a synchronous feedback chamber No. 1 is formed between the synchronous rear end cover and the main valve body and the synchronous valve core No. 1, and a synchronous feedback chamber No. 2 is formed between the synchronous valve core No. 1 and the synchronous valve core No. 2 and the main valve body; the synchronous small spring is installed in the synchronous rear end cover, and a plug is installed in the synchronous front end cover, the plug is connected to the piston, the piston is connected to the spring cover, and a rectangular spring, a spring flat shoulder and a synchronous large spring are installed in the spring cover, the synchronous small spring is connected to the synchronous valve core No. 1, the synchronous valve core No. 1 is connected to the synchronous valve core No. 2, and the synchronous valve core No. 2 is connected to the synchronous large spring; The hand-operated stop reversing valve comprises a stop rear end cover, a stop small spring, a stop reversing valve core, a stop reversing valve body, a stop front end cover and a stop hand-operated mechanism, wherein a stop reversing valve core is arranged in the stop reversing valve body, a stop front end cover is arranged at the front end of the stop reversing valve body, a stop rear end cover is arranged at the rear end of the stop reversing valve body, a stop small spring is arranged in the stop rear end cover, the stop small spring is connected to the stop reversing valve core, the stop reversing valve core passes through the stop rear end cover and is connected to the stop hand-operated mechanism; at the same time, a stop pressure input port and a stop pressure output port are arranged on the stop reversing valve body; The manual command valve comprises a main valve body, a spring flat shoulder, a rectangular spring, a spring cover, a manual mechanism, a plunger, a manual front end cover, a manual large spring, a manual valve core, a manual small spring and a manual rear end cover, wherein a manual valve core is arranged at the lower part of the main valve body, the manual front end cover is mounted on the lower front end of the main valve body, the manual rear end cover is mounted on the lower rear end of the main valve body, and a manual feedback chamber is formed between the manual rear end cover, the main valve body and the manual valve core, a manual small spring is mounted in the manual rear end cover, a spring cover is mounted in the manual front end cover, a rectangular spring, a manual large spring and a spring flat shoulder are mounted in the spring cover, the manual small spring is connected to one end of the manual valve core, the manual large spring is connected to the other end of the manual valve core, the manual valve core is connected to the plunger through the manual front end cover, and the plunger is connected to the manual mechanism; The main valve body is provided with a pressure input port for external connection, a No. 1 pressure reducing output port, a No. 2 pressure reducing output port, an oil return port and a command pressure port.

2. A hand-operated integrated valve with integrated cut-off reversing and synchronous dual-proportional pressure reduction according to claim 1, characterized in that: A flow channel for connecting the manual feedback chamber with the command pressure port is arranged inside the manual valve core.

3. A hand-operated integrated valve with integrated cut-off reversing and synchronous dual-proportional pressure reduction according to claim 1, characterized in that: A flow channel is provided inside the synchronous valve core No. 1 for connecting the synchronous feedback chamber No. 1 with the pressure reducing output port No.

1.

4. A hand-operated integrated valve with integrated cut-off reversing and synchronous dual-proportional pressure reduction according to claim 1, characterized in that: A flow channel is provided inside the synchronous valve core No. 1 for connecting the synchronous feedback chamber No. 2 with the second pressure reducing output port.

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