A single-oil-path bidirectional differential pressure control valve and control method

Abstract

The present application relates to a kind of single oil path bidirectional pressure difference control valve and control method, including valve pipeline body, left and right sides are connected with left oil pipe, right oil pipe respectively, its two sides are arranged in pairs middle body, spring, valve core and sealing cover, left oil pipe, right oil pipe outside is equipped with jack, bidirectional pressure difference control valve can realize three kinds of working conditions;When in complete communication state, two sides oil pipe is communicated, two jacks can provide same support force;When in complete isolation state, two sides oil pipe is independent of each other, the support reaction provided by two jacks has no connection;When in pressure difference control, when the pressure difference in two sides oil pipe is in controllable range, oil path is not communicated;When the pressure difference in two sides oil pipe breaks through set value, oil path is communicated, hydraulic oil flows to the side of smaller pressure, two sides pressure difference is controlled, until the pressure difference drops to below set value, valve is automatically closed.

Description

Technical Field

[0001] This invention belongs to the field of mechanical construction technology, and specifically relates to a single-oil-circuit bidirectional differential pressure control valve and control method. Background Technology

[0002] Multi-point support systems are a common support method for handling large loads, such as temporary supports during the construction of buildings and bridges. Multi-point support disperses the load application points, effectively reducing the local strength requirements of individual support points and ensuring the safety of the supported structure. However, due to the unpredictable deformation of the supported structure or changes in other boundary conditions, the forces acting on each support point in a multi-point support system are often unequal. Under unfavorable conditions, this can lead to the successive collapse of the multi-point support system, resulting in safety accidents. The traditional method of controlling the reaction force at each support point to be equal is to use a multi-point support system with controllable eccentric loads, ensuring that the hydraulic pressure or reaction force at each support point is the same. However, because the boss in this system can only move in one direction, it requires assembly with two one-way valves, resulting in a large size and high on-site application costs.

[0003] Therefore, how to provide a single-oil-circuit bidirectional differential pressure control valve and control method is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention provides a single-circuit bidirectional differential pressure control valve and control method, addressing the problem that existing bidirectional differential pressure control valves require the use of two check valves in different directions, resulting in a large size. To solve the above technical problems, this invention includes the following technical solution:

[0005] A single-circuit bidirectional differential pressure control valve, comprising:

[0006] The valve pipe body is connected to the left oil pipe and the right oil pipe on its left and right sides respectively, without distinguishing between upstream and downstream. The valve pipe body is provided with a middle body, spring, valve core and sealing cap on both sides.

[0007] Two symmetrical notches are made in the middle of the valve pipe body. Reinforcing ribs are set around the notches. The two ends of the notches are arc segments, and the middle of the notches is a straight segment, resulting in the notch diameter being larger at both ends and smaller in the middle. A third cavity is also set between the two notches. The upper and lower ends of the third cavity are connected to the two notches respectively. The third cavity is directly connected to the first cavity, and the third cavity is separated from the second cavity by a transverse partition and is not directly connected.

[0008] The valve core consists of, from the outside to the inside, a first nut, a rigid end plate, a first washer, a diaphragm, a second nut, a second washer, a sealing ring, and a valve core rod, all coaxially mounted on the screw. Except for the valve core rod, all other components are symmetrically arranged at both ends of the valve core rod. The valve core rod has an "I"-shaped block in the middle, with a screw rod having continuous external threads at both its upper and lower ends. The first washer, the second washer, and the screw rod are detachably connected by threads. The valve core is coaxially mounted with the notch and the third cavity, and the center distance between the two sealing rings in the valve core is the same as the center distance between the two notches.

[0009] Furthermore, the bidirectional differential pressure control valve can achieve three operating states: fully connected state, fully isolated state, and differential pressure control state;

[0010] When the bidirectional differential pressure control valve is in the fully connected state, the left oil pipe is connected to the right oil pipe, resulting in the same pressure on the left and right sides. The two jacks can provide the same supporting force, thus achieving uniform force distribution on the two support points. When the bidirectional differential pressure control valve is in the fully isolated state, the left oil pipe is independent of the right oil pipe, resulting in the pressure on both sides being unrelated. The supporting reaction forces provided by the two jacks are unrelated, thus achieving independent operation of the two support points. At this time, the rigidity of the support system is at its maximum.

[0011] When the two-way differential pressure control valve is under differential pressure control, the oil circuit is not connected when the pressure difference between the left and right oil pipes is within a controllable range, and the two fulcrums are in an independent working state. When the pressure difference between the two oil pipes exceeds the set value, the oil circuit is connected, the hydraulic oil flows to the side with lower pressure, and the pressure difference between the two sides is controlled until the pressure difference drops below the set value, at which point the valve automatically closes.

[0012] Furthermore, the valve pipe body is provided with connectors at both ends, which are respectively connected to the left oil pipe and the right oil pipe, and a first cavity and a second cavity are respectively provided at the adjacent positions of the connectors.

[0013] Furthermore, a raised ring is provided on the surface of the valve pipe body. The raised ring is coaxially arranged with two notches, and from the outside to the inside, they are the first protrusion, the first groove, and the second protrusion.

[0014] Furthermore, in the first cavity portion, a first connecting hole is provided in the pipe wall region between the notch and the protrusion; in the second cavity portion, a second connecting hole is provided in the pipe wall region between the notch and the protrusion; the first connecting hole and the second connecting hole are not adjacent to the same notch.

[0015] Furthermore, when the bidirectional differential pressure control valve is in its initial state, the two sealing rings are located at the center of the two notches respectively; the outer diameter of the sealing ring is larger than the maximum diameter of the arc segments at both ends of the notch but smaller than the diameter of the straight segment in the middle. Thus, when the sealing ring is located in the straight segment in the middle of the notch, the oil circuit can be blocked, and when it is located in the arc segment of the notch, the oil circuit can be connected.

[0016] Furthermore, the outer edge of the diaphragm has an outwardly bent edge, which is placed in the first groove. The intermediate body is screwed into the first protrusion to press the bent edge tightly into the first groove, thereby achieving oil circuit sealing.

[0017] This invention also provides a method for controlling a single-oil-circuit bidirectional differential pressure control valve, comprising:

[0018] Step S1: Provide the single-oil-circuit bidirectional differential pressure control valve;

[0019] Step S2: When both sealing caps are symmetrically screwed in to a reasonable degree, in the initial state, the sealing ring is located in the straight section in the middle of the notch, and the valve is in the closed state. When the oil pressure in the left oil pipe is greater than the oil pressure in the right oil pipe, the oil pressure in the left oil pipe is transmitted to the adjacent diaphragm through the first connecting hole, and the oil pressure in the right oil pipe is transmitted to the adjacent diaphragm through the second connecting hole. Since the pressure on the two diaphragms is unequal, the diaphragm drives the valve core to move towards the first connecting hole side, the valve opens, and the hydraulic oil flows from the left oil pipe through the second connecting hole to the right oil pipe, and the pressure difference between the left oil pipe and the right oil pipe decreases. As the pressure difference decreases, the valve core gradually returns to the equilibrium position, and the valve closes. When the oil pressure in the right oil pipe is greater than that in the left oil pipe, the oil pressure in the left oil pipe is transmitted to the adjacent diaphragm through the first connecting hole, and the oil pressure in the right oil pipe is transmitted to the adjacent diaphragm through the second connecting hole. Due to the unequal pressure on the two diaphragms, the diaphragms drive the valve core to move towards the second connecting hole, and the valve opens. Hydraulic oil flows from the right oil pipe through the second connecting hole to the left oil pipe, and the pressure difference between the left and right oil pipes decreases. As the pressure difference decreases, the valve core gradually returns to the equilibrium position, and the valve closes.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention provides a single-circuit bidirectional differential pressure control valve and control method. The differential pressure control valve adopts a symmetrical structure, achieving bidirectional hydraulic differential pressure regulation within a single oil circuit. The bidirectional differential pressure control valve includes three operating states: fully connected, fully isolated, and differential pressure control. These allow the oil circuits on both sides of the valve to meet different relative relationships. Especially in the fully connected and differential pressure control states, it enables the coordinated operation of two hydraulic devices without requiring any power input during application. This solves the problem of existing bidirectional differential pressure control valves requiring two check valves in different directions, resulting in a larger overall size. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the single-oil-circuit bidirectional differential pressure control valve in Example 1;

[0023] Figure 2 This is a disassembly diagram of the single-oil-circuit bidirectional differential pressure control valve in Example 1;

[0024] Figure 3 This is a schematic diagram of a partial structure of the valve pipeline in the single-oil-circuit bidirectional differential pressure control valve in Example 1;

[0025] Figure 4 This is a schematic diagram of the valve core assembly in the single-oil-circuit bidirectional differential pressure control valve of Example 1;

[0026] Figure 5 This is a schematic diagram of the valve core rod in the single-oil-circuit bidirectional differential pressure control valve in Example 1;

[0027] Figure 6 This is one of the schematic diagrams showing the working mode of the single-oil-circuit bidirectional differential pressure control valve in Example 1;

[0028] Figure 7 This is the second schematic diagram of the working mode of the single-oil-circuit bidirectional differential pressure control valve in Example 1.

[0029] In the picture,

[0030] 1-Left side oil pipe; 2-Right side oil pipe; 3-Valve pipe body; 301 Connector; 302-Reinforcing rib; 3021-Circular arc segment; 3022-Straight line segment. 303-convex ring, 3031-first protrusion, 3032-first groove, 3033-third protrusion, 304-notch, 305-second connecting hole, 306-first connecting hole, 307-first cavity, 308-second cavity, 309-third cavity, 310-diaphragm; 4-intermediate body, 401-first external thread, 402-second external thread; 5-sealing cap, 501-open cavity, 502-internal thread; 6-valve core, 601-first nut, 602-rigid end plate, 603-first pad, 604-diaphragm, 605-bent edge, 606-second nut, 607-second pad, 608-sealing ring, 609-valve core rod, 610-screw; 7-spring; 8-jack. Detailed Implementation

[0031] The following detailed description, in conjunction with specific embodiments, provides a further detailed explanation of the single-oil-circuit bidirectional differential pressure control valve and control method provided by the present invention. The advantages and features of the present invention will become clearer from the following description.

[0032] The following is combined Figures 1 to 7 The structural composition of the single-oil-circuit bidirectional differential pressure control valve of the present invention is described in detail.

[0033] Example 1

[0034] This embodiment uses a multi-point support system commonly used in the construction industry as an application example. Of course, the single-circuit bidirectional differential pressure control valve in this embodiment can also be used in other situations requiring multiple hydraulic supports and potentially subject to uneven loads, to eliminate the effects of uneven loads. A multi-point support system may contain several jacks; taking two of them as an example... Figure 1 As shown, the two jacks 8 are connected to the left oil pipe 1 and the right oil pipe 2 respectively. The left oil pipe 1 and the right oil pipe 2 are connected through the single oil circuit bidirectional differential pressure control valve.

[0035] Please refer to Figures 1 to 4 A bidirectional differential pressure control valve includes a valve pipe body 3, an intermediate body 4, a sealing cap 5, a spring 7, and a valve core 6. The valve pipe body 3 is connected to the left oil pipe 1 and the right oil pipe 2 on its left and right sides, respectively, without distinguishing between upstream and downstream. Each bidirectional differential pressure control valve has two intermediate bodies 4, sealing caps 5, and springs 7, which are located on opposite sides of the valve pipe body 3.

[0036] The bidirectional differential pressure control valve is connected to the left oil pipe 1 and the right oil pipe 2, enabling relative pressure control of the two jacks 8 without requiring additional power input. The valve operates in three states: fully connected, fully isolated, and differential pressure control. When fully connected, the left oil pipe 1 and right oil pipe 2 are connected, resulting in equal pressure on both sides. This allows the two jacks 8 to provide the same supporting force, achieving uniform force distribution at the two support points. When fully isolated, the left oil pipe 1 and right oil pipe 2 are independent, resulting in uncorrelated pressures on both sides. The supporting reaction forces provided by the two jacks 8 are unrelated, allowing the two support points to operate independently. In this state, the rigidity of the support system is maximized. When the two-way differential pressure control valve is under differential pressure control, the oil circuit is not connected when the pressure difference between the left oil pipe 1 and the right oil pipe 2 is within the controllable range. At this time, the two fulcrums are in an independent working state. When the pressure difference between the two oil pipes exceeds the set value, the oil circuit is connected, the hydraulic oil flows to the side with lower pressure, and the pressure difference between the two sides is controlled until the pressure difference drops below the set value, at which point the valve automatically closes.

[0037] In this embodiment, more preferably, the valve pipe body 3 has oil pipe connectors 301 at both ends, which are connected to the left oil pipe 1 and the right oil pipe 2. The first cavity 307 and the second cavity 308 are located adjacent to the oil pipe connectors 301, respectively.

[0038] In this embodiment, more preferably, two notches 304 are symmetrically opened in the middle of the valve pipe body, and reinforcing ribs 302 are provided around the notches. The shape of the notches is that the two ends are arc segments 3021 and the middle is a straight segment 3022, resulting in the notch diameter being larger at both ends and smaller in the middle. A third cavity 309 is also provided between the two notches 304. The upper and lower ends of the third cavity 309 are respectively connected to the two notches 304. The third cavity 309 is also directly connected to the first cavity 307, and is separated from the second cavity 308 by a transverse partition 310 and is not directly connected.

[0039] In this embodiment, more preferably, a raised ring 303 is provided on the surface of the valve pipe body. The raised ring 303 is coaxially arranged with two notches 304, and from the outside to the inside, they are a first protrusion 3031, a first groove 3032, and a second protrusion 3033.

[0040] In this embodiment, more preferably, in the first cavity 307 portion, a first connecting hole 306 is provided on the pipe wall region between the notch 304 and the protrusion 303; in the second cavity 308 portion, a second connecting hole 305 is provided on the pipe wall region between the notch 304 and the protrusion 303; the first connecting hole 306 and the second connecting hole 305 are not adjacent to the same notch 304.

[0041] In this embodiment, more preferably, one end of the intermediate body 4 is slightly larger, forming a large channel 403, and the other end is slightly smaller, forming a small channel 404. Both ends are provided with a first external thread 401 and a second external thread 402, and the two ends are respectively threaded to the valve pipe body 3 and the sealing cap 5.

[0042] Correspondingly, the sealing cap 5 is closed at one end and open at the other, forming an open cavity 501. An internal thread 502 is provided at the open end, which cooperates with the first external thread 401 at the smaller diameter end of the intermediate body 4.

[0043] The valve core 6, from the outside to the inside, consists of a first nut 601, a rigid end plate 602, a first washer 603, a diaphragm 604, a second nut 606, a second washer 607, a sealing ring 608, and a valve core rod 609. Except for the valve core rod 609, the other components are symmetrically arranged at both ends of the valve core rod 609. The valve core rod 609 has an "I"-shaped block in the middle, with a threaded rod 610 at both its upper and lower ends. The first nut 601, rigid end plate 602, first washer 603, diaphragm 604, second nut 606, second washer 607, and sealing ring 608 are all coaxially arranged on the rod 610.

[0044] In this embodiment, more preferably, the first pad 603 and the second pad 607 are detachably connected to the screw 610 by threads.

[0045] In this embodiment, more preferably, the valve core 6 is coaxially arranged with the notch 304 and the third cavity 309, and the center distance between the two sealing rings 608 in the valve core is the same as the center distance between the two notches 304. When the bidirectional differential pressure control valve is in its initial state, the two sealing rings 608 are located at the center of the two notches 304 respectively. The outer diameter of the sealing ring is larger than the maximum diameter of the arc segments 3021 at both ends of the notch 304 but smaller than the diameter of the straight segment 3022 in the middle. Therefore, when the sealing ring 608 is located in the straight segment 3022 in the middle of the notch 304, it can achieve oil circuit blockage, and when it is located in the arc segment 3021 of the notch, it can achieve oil circuit connection.

[0046] In this embodiment, more preferably, the outer edge of the diaphragm 604 has an outwardly bent edge 605. The bent edge 605 is placed in the first groove 3032, and the intermediate body 4 is screwed into the first protrusion 3031 to press the bent edge 605 into the first groove 3032, thereby achieving oil circuit sealing.

[0047] In this embodiment, more preferably, the spring 7 is disposed in the space formed by the intermediate body 4 and the sealing cover 5, with one end of the spring pressing against the sealing cover 5 and the other end pressing against the rigid end plate 602 on the valve core 6.

[0048] The first connecting hole 306 and the second connecting hole 305 allow hydraulic oil to enter the space between the diaphragm 604 and the valve pipe body 3. Since the valve adopts a symmetrical structure, under the same oil pressure, the two diaphragms bear the same hydraulic pressure. Therefore, when the hydraulic pressure in the left oil pipe 1 and the right oil pipe 2 is the same, the movement of the valve core 6 is completely determined by the compression of the two springs 7.

[0049] The distance between the sealing cap 5 and the intermediate body 4 can be adjusted by rotating the sealing cap 5, thereby controlling the compression of the spring 7. When both sealing caps 5 are screwed in symmetrically, the valve core 6 remains in the center position and the spring 7 is compressed to its maximum deformation, at which point the valve is in a completely isolated state. When one sealing cap 5 is fully screwed in, causing the spring 7 to be compressed, while the other sealing cap 5 is screwed out to a certain extent, causing the spring 7 to be relaxed, the valve core 6 will deviate from the center position, and the sealing ring 608 will deviate from the straight section 3022 in the middle of the notch 304, at which point the valve is in a completely connected state.

[0050] In this embodiment, a single-oil-circuit bidirectional differential pressure control valve control method is also provided, combined with Figure 6When both sealing caps 5 are symmetrically screwed in to a reasonable degree, in the initial state, the sealing ring 608 is located in the straight section of the notch 304, and the valve is in the closed state. When the oil pressure in the left oil pipe 1 is greater than that in the first connecting hole 306, it is transmitted to the adjacent diaphragm 604. The oil pressure in the right oil pipe 2 is transmitted to the adjacent diaphragm 604 through the second connecting hole 305. Due to the unequal pressure on the two diaphragms 604, the diaphragm 604 drives the valve core 6 to move towards the first connecting hole 306, the valve opens, and hydraulic oil flows from the left oil pipe 1 through the second connecting hole 305 to the right oil pipe 2, reducing the pressure difference between the left oil pipe 1 and the right oil pipe 2. As the pressure difference decreases, the valve core 6 gradually returns to the equilibrium position, and the valve closes.

[0051] Combination Figure 7 When both sealing caps 5 are symmetrically screwed in to a reasonable degree, in the initial state, the sealing ring 608 is located in the straight section of the notch 304, and the valve is in the closed state. When the oil pressure in the right oil pipe 2 is greater than the oil pressure in the left oil pipe 1, the oil pressure in the left oil pipe 1 is transmitted to the adjacent diaphragm 604 through the first connecting hole 306, and the oil pressure in the right oil pipe 2 is transmitted to the adjacent diaphragm 604 through the second connecting hole 305. Due to the unequal pressure on the two diaphragms 604, the diaphragm 604 drives the valve core 6 to move towards the second connecting hole 305, the valve opens, and hydraulic oil flows from the right oil pipe 2 through the second connecting hole 305 to the left oil pipe 1, reducing the pressure difference between the left oil pipe 1 and the right oil pipe 2. As the pressure difference decreases, the valve core 6 gradually returns to the equilibrium position, and the valve closes.

[0052] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only illustrate several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A single-oil-circuit bidirectional differential pressure control valve, characterized in that, include: The valve pipe body is connected to the left oil pipe and the right oil pipe on its left and right sides respectively, without distinguishing between upstream and downstream. The valve pipe body is provided with a middle body, spring, valve core and sealing cap on both sides. Two symmetrical notches are made in the middle of the valve pipe body. Reinforcing ribs are set around the notches. The two ends of the notches are arc segments, and the middle of the notches is a straight segment, resulting in the notch diameter being larger at both ends and smaller in the middle. A third cavity is also set between the two notches. The upper and lower ends of the third cavity are connected to the two notches respectively. The third cavity is directly connected to the first cavity, and the third cavity is separated from the second cavity by a transverse partition and is not directly connected. The valve core consists of, from the outside to the inside, a first nut, a rigid end plate, a first washer, a diaphragm, a second nut, a second washer, a sealing ring, and a valve core rod, all coaxially mounted on the screw. Except for the valve core rod, all other components are symmetrically arranged at both ends of the valve core rod. The valve core rod has an "I"-shaped block in the middle, with a screw rod having continuous external threads at both its upper and lower ends. The first washer, the second washer, and the screw rod are detachably connected by threads. The valve core is coaxially mounted with the notch and the third cavity, and the center distance between the two sealing rings in the valve core is the same as the center distance between the two notches.

2. The single-oil-circuit bidirectional differential pressure control valve according to claim 1, characterized in that, The bidirectional differential pressure control valve can achieve three working states: fully connected, fully isolated, and differential pressure control. When the bidirectional differential pressure control valve is in the fully connected state, the left and right oil pipes are connected, resulting in the same pressure on both sides. When the bidirectional differential pressure control valve is in the fully isolated state, the left and right oil pipes are independent of each other, resulting in unrelated pressures on both sides. When the bidirectional differential pressure control valve is in differential pressure control, the oil circuit is not connected when the pressure difference between the left and right oil pipes is within a controllable range. When the pressure difference between the two oil pipes exceeds the set value, the oil circuit is connected, the hydraulic oil flows to the side with lower pressure, and the pressure difference between the two sides is controlled until the pressure difference drops below the set value, at which point the valve automatically closes.

3. The single-oil-circuit bidirectional differential pressure control valve according to claim 1, characterized in that, The valve pipe body is provided with connectors at both ends, which are respectively connected to the left oil pipe and the right oil pipe. The first cavity and the second cavity are respectively provided at the adjacent positions of the connectors.

4. The single-oil-circuit bidirectional differential pressure control valve according to claim 1, characterized in that, A raised ring is provided on the surface of the valve pipe body. The raised ring is coaxially arranged with two notches. From the outside to the inside, they are the first protrusion, the first groove, and the second protrusion.

5. The single-oil-circuit bidirectional differential pressure control valve according to claim 3, characterized in that, In the first cavity, a first connecting hole is provided in the pipe wall area between the notch and the protrusion; in the second cavity, a second connecting hole is provided in the pipe wall area between the notch and the protrusion; the first connecting hole and the second connecting hole are not adjacent to the same notch.

6. The single-oil-circuit bidirectional differential pressure control valve according to claim 1, characterized in that, When the bidirectional differential pressure control valve is in its initial state, the two sealing rings are located at the center of the two notches respectively. The outer diameter of the sealing ring is larger than the maximum diameter of the arc segments at both ends of the notch but smaller than the diameter of the straight segment in the middle. Thus, when the sealing ring is located in the straight segment in the middle of the notch, the oil circuit can be blocked, and when it is located in the arc segment of the notch, the oil circuit can be connected.

7. The single-oil-circuit bidirectional differential pressure control valve according to claim 1, characterized in that, The outer edge of the diaphragm has an outwardly bent edge, which is placed in the first groove. The intermediate body is screwed into the first protrusion, pressing the bent edge tightly into the first groove to achieve oil circuit sealing.

8. A method for controlling a single-oil-circuit bidirectional differential pressure control valve, characterized in that, include: Step S1: Provide a single-oil-circuit bidirectional differential pressure control valve as described in any one of claims 5 to 7; Step S2: When both sealing caps are symmetrically screwed in to a reasonable degree, in the initial state, the sealing ring is located in the straight section in the middle of the notch, and the valve is in the closed state. When the oil pressure in the left oil pipe is greater than the oil pressure in the right oil pipe, the oil pressure in the left oil pipe is transmitted to the adjacent diaphragm through the first connecting hole, and the oil pressure in the right oil pipe is transmitted to the adjacent diaphragm through the second connecting hole. Since the pressure on the two diaphragms is unequal, the diaphragm drives the valve core to move towards the first connecting hole side, the valve opens, and the hydraulic oil flows from the left oil pipe through the second connecting hole to the right oil pipe, and the pressure difference between the left oil pipe and the right oil pipe decreases. As the pressure difference decreases, the valve core gradually returns to the equilibrium position, and the valve closes. When the oil pressure in the right oil pipe is greater than that in the left oil pipe, the oil pressure in the left oil pipe is transmitted to the adjacent diaphragm through the first connecting hole, and the oil pressure in the right oil pipe is transmitted to the adjacent diaphragm through the second connecting hole. Due to the unequal pressure on the two diaphragms, the diaphragms drive the valve core to move towards the second connecting hole, and the valve opens. Hydraulic oil flows from the right oil pipe through the second connecting hole to the left oil pipe, and the pressure difference between the left and right oil pipes decreases. As the pressure difference decreases, the valve core gradually returns to the equilibrium position, and the valve closes.

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