Integrated hydraulic reversing valve

Abstract

The utility model relates to the field of hydraulic reversing valves, and discloses an integrated hydraulic reversing valve which comprises an oil collecting block, a filter element, a reversing pressure regulating valve and a safety valve, the reversing pressure regulating valve is installed in a corresponding valve hole of the oil collecting block, a valve inlet is communicated with a filter cavity, a valve outlet is communicated with a reversing oil way, and the safety valve is installed in a corresponding valve hole of the oil collecting block. The valve inlet is communicated with an oil inlet P formed in the oil collecting block, the valve outlet is communicated with an oil return port T formed in the oil collecting block, the hydraulic reversing valve is fixedly installed on the front plane of the oil collecting block in a plate mode, runner holes in the valve are communicated with corresponding runner holes in the oil collecting block, and runners comprise a runner a, a runner b, a runner c, a runner d, a runner e, a runner f, a runner g and a runner h. Reversing is achieved through alternate vertical displacement of the piston, the occupied area and space of the reversing valve are effectively reduced, the filter element filters inlet oil, the service life can be prolonged, the valve element of the safety valve is automatically opened during overpressure, and the phenomenon that equipment is damaged is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic reversing valves, in particular to an integrated hydraulic reversing valve. Background Art

[0002] The dry oil dual-line lubrication system is the most widely used lubrication system. The core component of the system is the dual-line lubrication pump station. The reversing valves used in the dual-line lubrication pump station include electric reversing valves, solenoid reversing valves, hydraulic reversing valves and other types. Electric reversing valves and solenoid reversing valves must be used with pressure detection elements and electronic control boxes, while the hydraulic reversing valve can automatically reverse according to the set pressure. The valve can be connected to the electronic control with a valve position detection element to achieve fully automatic lubrication. The system has a simple structure, good reliability and low cost, and has been widely promoted and used.

[0003] The currently commonly used two-line lubrication pump station with a hydraulic reversing valve consists of a lubrication pump (with a safety valve and a pressure gauge valve block on the pump), a hydraulic reversing valve, a Y-type dry oil filter, piping, an electric control box, and a large base plate. The pump station is large in size, and the piping requires high skills and low efficiency for the assembly workers. The degree of integration is low, and there is no safety valve in the previous reversing valve. If the oil outlet cannot discharge oil or the pressure in the flow channel is too high in other situations, it is easy to cause damage to the equipment.

[0004] In the document CN202320304485, a 120° reversing valve lined with wear-resistant materials is disclosed, including a valve body, a main valve core, and an auxiliary valve core. The valve body is provided with a first flow channel, a second flow channel, and a third flow channel arranged in a circumferential array. The main valve core is rotatably connected to the valve body. The main valve core is provided with a main flow channel, and the main flow channel can communicate with any two of the first flow channel, the second flow channel, and the third flow channel. The auxiliary valve core is rotatably connected to the main valve core, and the auxiliary valve core is provided with an auxiliary flow channel. The auxiliary valve core can be rotated until the main flow channel and the auxiliary flow channel are connected or staggered. If a filter element is not provided in the reversing valve of this structure, impurities in the lubricating oil can easily damage the entire device, reducing the overall service life of the device.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0006] In order to solve the above problems, the utility model discloses an integrated hydraulic reversing valve, which realizes reversal through alternating up and down displacement of the piston, effectively reducing the floor space and space occupied by the reversing valve. The filter element filters the incoming oil to increase the service life. When overpressure occurs, the valve core of the safety valve automatically opens, effectively avoiding damage to the equipment.

[0007] The technical scheme of the utility model is: an integrated hydraulic reversing valve, including an oil collecting block, a filter element, a hydraulic reversing valve, a reversing pressure regulating valve and a safety valve, the filter element is located in the filter cavity of the oil collecting block, and is sealed and fixed on the left side by a filter screw plug, the reversing pressure regulating valve is installed in the corresponding valve hole of the oil collecting block, the valve inlet is connected to the filter cavity, the valve outlet is connected to the reversing oil path, the safety valve is installed in the corresponding valve hole of the oil collecting block, the valve inlet is connected to the oil inlet P opened on the oil collecting block, the valve outlet is connected to the oil return port T opened on the oil collecting block, the hydraulic reversing valve is plate-mounted and fixed on the front plane of the oil collecting block, each flow channel hole on the valve is connected to the corresponding flow channel hole on the oil collecting block, a piston is arranged inside the oil collecting block, and the flow channels include flow channel a, flow channel b, flow channel c, flow channel d, flow channel e, flow channel f, flow channel g and flow channel h.

[0008] Preferably, three piston holes are provided inside the hydraulic reversing valve, and piston a, piston b and piston c are respectively provided in the piston holes. The length of the piston hole is greater than the size of the piston. Four limit rings are evenly arranged from top to bottom of the piston, namely limit ring a, limit ring b, limit ring c and limit ring d. The diameter of the piston hole is matched with the diameter of the limit ring. A magnetic sensor is provided at the bottom of the piston a, and the magnetic sensor is connected to the corresponding electrical control box.

[0009] By adopting the above technical solution, the up and down displacement of the piston in the piston hole and the change of the corresponding position of the limit ring can realize the reversing effect of the reversing valve.

[0010] Preferably, when piston b is located at the top of the piston hole, flow channel a passes through the pressure gauge, and flow channel a is connected to the reversing pressure regulating valve and the valve core of the safety valve, flow channel a is connected to the oil inlet P, flow channel a is connected to flow channel g at the upper part of the piston hole at the top of piston a, flow channel g is connected to the oil outlet A, flow channel a is located between the limit ring b and the limit ring c of piston b, and flow channel a and flow channel g are connected between the limit ring b and the limit ring c of piston b.

[0011] Preferably, when piston b is located at the bottom of the piston hole, flow channel a is connected to flow channel e at the lower part of the piston hole at the bottom of piston a, flow channel e is connected to oil outlet B, flow channel a is located between the limit ring b and the limit ring c of piston b, and flow channel a and flow channel e are connected between the limit ring b and the limit ring c of piston b.

[0012] Preferably, when piston a is located at the top of the piston hole, flow channel b is connected to the valve core of the reversing pressure regulating valve, flow channel b is connected to flow channel f, flow channel f is connected to the piston hole at the top of piston c, flow channel b is located between the limit ring b and the limit ring c of piston a, and flow channel b and flow channel f are connected between the limit ring b and the limit ring c of piston a.

[0013] Preferably, when piston a is located at the bottom of the piston hole, flow channel b is connected to the valve core of the reversing pressure regulating valve, flow channel b is connected to flow channel h, flow channel h is connected to the piston hole at the bottom of piston c, flow channel b is located between the limit ring b and the limit ring c of piston a, and flow channel b and flow channel h are connected between the limit ring b and the limit ring c of piston a.

[0014] Preferably, when piston c is at the top of the piston hole, flow channel a is connected to flow channel c at the upper part of the piston hole at the top of piston b, flow channel a is located between the limit ring b and the limit ring c of piston c, and flow channel a and flow channel c are connected between the limit ring b and the limit ring c of piston c.

[0015] Preferably, when piston c is located at the bottom of the piston hole, flow channel a is connected to flow channel d at the lower part of the piston hole at the bottom of piston b, flow channel a is located between the limit ring b and the limit ring c of piston c, and flow channel a and flow channel d are connected between the limit ring b and the limit ring c of piston c.

[0016] Preferably, the valve core is located in the cavity of the reversing pressure regulating valve and the safety valve, the valve core is a downward cone, the diameter of the valve core and the flow channel match, and the valve core abuts against the cavity of the reversing pressure valve and the safety valve through a spring.

[0017] By adopting the above technical solution, the valve core is pushed upward according to the preset pressure value for being ejected, thereby facilitating the movement of the lubricating oil in the flow channel.

[0018] Advantages of the utility model: 1. The utility model realizes the reversing function of the reversing valve by means of three pistons that alternately move up and down in the piston hole, which is simple, convenient and fast.

[0019] 2. The utility model integrates the reversing pressure regulating valve, pressure gauge, safety valve and filter element on the same oil collecting block, effectively reducing the floor space and space occupied by the reversing valve and saving more space for the factory.

[0020] 3. The utility model provides a filter element to allow the lubricating oil to flow into the next flow channel after filtering, which can effectively reduce the damage of impurities in the lubricating oil to the reversing valve and increase the overall service life of the reversing valve.

[0021] 4. The utility model provides a safety valve, and the valve core of the safety valve is conical and fits the flow channel. When the internal pressure is too large, the valve core of the safety valve is opened, which effectively avoids the phenomenon of equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of the first valve position of the reversing valve of the utility model;

[0023] Figure 2 This is a structural schematic diagram of the second valve position of the reversing valve of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the piston of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the safety valve of the utility model when it is closed;

[0026] Figure 5 This is a schematic diagram of the structure of the safety valve of the utility model when it is opened;

[0027] Figure 6 This is a schematic diagram of the structure of step 1 of the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of step 2 of the utility model;

[0029] Figure 8 This is a schematic diagram of the structure of step 3 of the utility model;

[0030] Fig. 9 It is a structural schematic diagram of step 4 of the utility model;

[0031] Fig.10 This is a schematic diagram of the structure of step 5 of the utility model;

[0032] Fig.11 This is a schematic diagram of the structure of step 6 of the utility model;

[0033] Fig.12 This is a schematic diagram of the structure of step 7 of the utility model;

[0034] Fig.13 It is a structural schematic diagram of step 8 of the utility model.

[0035] Among them: 1. filter plug, 2. filter element, 3. oil collecting block, 4. reversing pressure regulating valve, 5. pressure gauge, 6. valve core, 61, spring, 7. safety valve, 8. oil return port T, 9. oil inlet port P, 10. magnetic sensor, 11. oil outlet A, 12. oil outlet B, 13. reversing oil circuit A, 14. reversing oil circuit B, 15. piston a, 16. piston b, 17. piston c, 18. limit ring a, 19. limit ring b, 20. limit ring c, 21. limit ring d, 22. hydraulic reversing valve. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] like Figure 1-5As shown, an integrated hydraulic reversing valve includes an oil collecting block 3, a filter element 2, a hydraulic reversing valve 22, a reversing pressure regulating valve 4 and a hydraulic reversing valve 6. The filter element 2 is located in the filter chamber of the oil collecting block 3, and is sealed and fixed on the left side by a filter plug 1. The reversing pressure regulating valve 4 is installed in the corresponding valve hole of the oil collecting block 3, the valve inlet is connected to the filter chamber, the valve outlet is connected to the reversing oil circuit, the safety valve 7 is installed in the corresponding valve hole of the oil collecting block 3, the valve inlet is connected to the oil inlet P9 opened on the oil collecting block 3, and the valve outlet is connected to the oil return port T8 opened on the oil collecting block 3. The hydraulic reversing valve 22 is plate-mounted and fixed on the front plane of the oil collecting block 3, and each flow channel hole on the valve is connected to the corresponding flow channel hole on the oil collecting block 3. A piston is provided inside the oil collecting block 3, and the flow channels include flow channel a, flow channel b, flow channel c, flow channel d, flow channel e, flow channel f, flow channel g and flow channel h, and the flow channels do not intersect with each other.

[0038] Three piston holes are provided inside the hydraulic reversing valve 22, and pistons a15, b16 and c17 are respectively provided in the piston holes. The length of the piston hole is greater than the size of the piston. Four limit rings are evenly arranged from top to bottom of the piston, namely limit ring a18, limit ring b19, limit ring c20 and limit ring d21. The diameter of the piston hole is adapted to the diameter of the limit ring. A magnetic sensor 10 is provided at the bottom of the piston a15, and the magnetic sensor 10 is connected to the corresponding electric control box. The magnetic sensor 10 detects the movement of the piston a15 and sends a reversing pulse signal to obtain the internal reversing number. The up and down displacement of the piston in the piston hole and the change of the corresponding position of the limit ring can realize the reversing effect of the reversing valve.

[0039] When the piston b16 is located at the top of the piston hole, the flow channel a passes through the pressure gauge, and the flow channel a is connected to the reversing pressure regulating valve 4 and the valve core of the safety valve 7, the flow channel a is connected to the oil inlet P9, the flow channel a is connected to the flow channel g on the upper part of the piston hole at the top of the piston a15, and the flow channel g is connected to the oil outlet A11. The flow channel a is located between the limit ring b19 and the limit ring c20 of the piston b16, and the flow channel a and the flow channel g are connected between the limit ring b19 and the limit ring c20 of the piston b16.

[0040] When the piston b16 is located at the bottom of the piston hole, the flow channel a is connected to the flow channel e at the lower part of the piston hole at the bottom of the piston a15, and the flow channel e is connected to the oil outlet B12. The flow channel a is located between the limit ring b19 and the limit ring c20 of the piston b16, and the flow channel a and the flow channel e are connected between the limit ring b19 and the limit ring c20 of the piston b16.

[0041] When the piston a15 is located at the top of the piston hole, the flow channel b is connected to the valve core of the reversing pressure regulating valve 4, the flow channel b is connected to the flow channel f, the flow channel f is connected to the piston hole at the top of the piston c17, the flow channel b is located between the limit ring b19 and the limit ring c20 of the piston a15, and the flow channel b and the flow channel f are connected between the limit ring b19 and the limit ring c20 of the piston a15.

[0042] When the piston a15 is located at the bottom of the piston hole, the flow channel b is connected to the valve core of the reversing pressure regulating valve 4, the flow channel b is connected to the flow channel h, the flow channel h is connected to the piston hole at the bottom of the piston c17, the flow channel b is located between the limit ring b19 and the limit ring c20 of the piston a15, and the flow channel b and the flow channel h are connected between the limit ring b19 and the limit ring c20 of the piston a15.

[0043] When piston c17 is at the top of the piston hole, the flow channel a is connected to the flow channel c on the upper part of the piston hole at the top of piston b16, and the flow channel a is located between the limiting ring b19 and the limiting ring c20 of piston c17, and the flow channel a and the flow channel c are connected between the limiting ring b19 and the limiting ring c20 of piston c17.

[0044] When piston c17 is located at the bottom of the piston hole, the flow channel a is connected to the flow channel d at the lower part of the piston hole at the bottom of piston b16, and the flow channel a is located between the limit ring b19 and the limit ring c20 of piston c17, and the flow channel a and the flow channel d are connected between the limit ring b19 and the limit ring c20 of piston c17.

[0045] The valve core 6 is located in the cavity of the reversing pressure regulating valve 4 and the safety valve 7. The valve core 6 is in a downward cone shape. The diameter of the valve core 6 and the flow channel match. The valve core 6 is abutted against the reversing pressure valve 4 and the cavity of the safety valve 7 through the spring 61. The set opening pressure of the valve core 6 of the safety valve 7 is higher than the pressure required for the normal operation of the lubrication system. When the oil outlet or the valve block is blocked and the lubricating oil cannot flow, the oil pressure will exceed the set pressure of the safety valve, pushing open the valve core 6 of the safety valve 7 to protect the equipment.

[0046] Working principle:

[0047] like Figure 6As shown, step 1: piston a15 is located at the bottom of the piston hole, piston b16 is located at the top of the piston hole, piston c17 is located at the bottom of the piston hole, and the lubricating oil enters from the oil inlet P9, passes through the safety valve 7 from the flow channel a, flows through the filter element 2, and then flows through the reversing pressure regulating valve 4 and the pressure gauge 5, flows through the cavity between the limiting ring b19 and the limiting ring c20 of piston b16, and at the same time flows from the flow channel g to the piston hole at the top of piston a15, and then flows from the piston hole through the flow channel g to the oil outlet A11, and the oil flows out. Port A11 is connected to the equipment, and at the same time, the lubricating oil flows from flow channel d to the cavity between the stop ring b19 and the stop ring c20 of piston c17, and then flows to the piston hole at the bottom of piston b16, pushing piston b16 upward. The oil is continuously injected. After being filled, the pressure in flow channels a, flow channels d, and flow channels g slowly rises. When the pressure exceeds the set value of the valve core 6 of the reversing pressure regulating valve 4, the lubricating oil in flow channel a pushes open the valve core 6 of the reversing pressure regulating valve 4. At this time, a part of the lubricating oil flows out from the flow channel b connected to the valve core 6.

[0048] like Figure 7 As shown, step 2: the lubricating oil flows in the flow channel b through the cavity between the limiting ring b19 and the limiting ring c20 of the piston a15, and then flows to the bottom of the piston c17 through the flow channel h;

[0049] like Figure 8 As shown, step 3: the piston c17 is pushed up by the lubricating oil, the limiting ring b19 of the piston c17 is located at the upper part of the flow channel c, the limiting ring c20 is located at the lower part of the flow channel c, the flow channel a is connected with the flow channel c, and the limiting ring c20 cuts off the channel between the flow channel a and the flow channel d;

[0050] like Fig. 9 As shown, step 4: driven by the lubricating oil pressure, piston b16 moves downward, piston b16 reaches the bottom of the piston hole, and the limiting ring b19 and the limiting ring c20 also move downward. The limiting ring b19 of piston b16 cuts off the path of flow channel g that flows upward through flow channel a. The lubricating oil in flow channel a flows between the limiting ring b19 and the limiting ring c20 and flows to flow channel e, flows to the bottom of piston a15, pushes piston a15 upward, and flows out from the oil outlet B12. The lubricating oil at the oil inlet P9 is disconnected from the oil outlet A11 and connected to the oil outlet B12. The hydraulic valve completes the reversal. Since there is no pressure at the oil outlet B12, the pressure at the oil inlet P9 is reduced, causing the valve core 6 of the reversing pressure regulating valve 4 to drop and close. At this time, the flow channel b and the flow channel a are cut off.

[0051] like Fig.10As shown, step 5: after the hydraulic valve completes the reversal, the lubricating oil is continuously injected into the oil outlet B12. After it is filled, the pressure of the oil outlet B12 rises, and the pressure in the flow channels a, flow channels c, and flow channels e rises slowly. When the pressure exceeds the setting of the reversing pressure regulating valve 4, the lubricating oil in the flow channel a pushes open the valve core 6 of the reversing pressure regulating valve 4. At this time, a part of the lubricating oil flows out from the flow channel b connected to the valve core 6, and the limit ring b19 and the limit ring c20 of the piston a15 are connected to the flow channel f, and flows toward the top of the piston c17 connected to the flow channel f;

[0052] like Fig.11 As shown, step 6: the lubricating oil pushes the piston c17 to move downward, the piston c17 is located at the bottom of the piston hole, the cavity between the limiting ring b19 and the limiting ring c20 of the piston c17 is connected with the flow channel d, that is, the lubricating oil in the flow channel a between the limiting ring b19 and the limiting ring c20 of the piston b16 flows into the flow channel d and finally reaches the bottom of the piston b16, and the piston cavity at the bottom of the piston b16 is connected with the oil inlet P9;

[0053] like Fig.12 As shown, step 7: the piston b16 is pushed up by the lubricating oil, the piston b16 reaches the top of the piston hole, the limiting ring c20 cuts off the channel between the flow channel a and the flow channel e, and the limiting ring b19 and the limiting ring c20 connect the flow channel a and the flow channel g;

[0054] like Fig.13 As shown, step 8: due to the pressure of the lubricating oil, the piston a15 moves downward in the piston hole to the bottom, and the piston hole at the top of the piston a15 is filled with the lubricating oil, and then flows out from the flow channel g through the oil outlet A11 to complete the reversal. Since there is no pressure at the oil outlet A11, the pressure at the oil inlet P9 decreases, causing the valve core 6 of the reversing pressure regulating valve 4 to drop and close. At this time, the flow channel b and the flow channel a are cut off, and the state returns to step 1, and then the cycle is repeated.

[0055] Among them, steps 1 to 3, steps 7 and 8 are for the reversing valve position 1 (oil outlet A is connected to the oil inlet P, and oil outlet B is connected to the oil inlet T); steps 4 to 6 are for the reversing valve position 2 (oil outlet A is connected to the oil inlet T, and oil outlet B is connected to the oil inlet P).

[0056] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention, and the purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the implementation methods of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. An integrated hydraulic reversing valve, comprising an oil collecting block, a filter element, a hydraulic reversing valve, a reversing pressure regulating valve and a safety valve, wherein the filter element is located in a filter cavity of the oil collecting block and is sealed and fixed on the left side by a filter screw plug, and is characterized in that: The reversing pressure regulating valve is installed in the corresponding valve hole of the oil collecting block, the valve inlet is connected to the filter chamber, the valve outlet is connected to the reversing oil circuit, the safety valve is installed in the corresponding valve hole of the oil collecting block, the valve inlet is connected to the oil inlet P opened on the oil collecting block, the valve outlet is connected to the oil return port T opened on the oil collecting block, the hydraulic reversing valve plate is installed and fixed on the front plane of the oil collecting block, each flow channel hole on the valve is connected to the corresponding flow channel hole on the oil collecting block, a piston is provided inside the oil collecting block, and the flow channels include flow channel a, flow channel b, flow channel c, flow channel d, flow channel e, flow channel f, flow channel g and flow channel h.

2. The integrated hydraulic reversing valve according to claim 1, characterized in that: Three piston holes are provided inside the hydraulic reversing valve, and pistons a, piston b and piston c are respectively provided in the piston holes. The length of the piston hole is greater than the size of the piston. Four limit rings are evenly arranged from top to bottom of the piston, namely limit ring a, limit ring b, limit ring c and limit ring d. The diameter of the piston hole is adapted to the diameter of the limit ring. A magnetic sensor is provided at the bottom of the piston a, and the magnetic sensor is connected to the corresponding electric control box.

3. The integrated hydraulic reversing valve according to claim 1, characterized in that: When the piston b is located at the top of the piston hole, the flow channel a passes through the pressure gauge, and the flow channel a is connected to the reversing pressure regulating valve and the valve core of the safety valve, the flow channel a is connected to the oil inlet P, the flow channel a is connected to the flow channel g on the upper part of the piston hole at the top of the piston a, and the flow channel g is connected to the oil outlet A. The flow channel a is located between the limit ring b and the limit ring c of the piston b, and the flow channel a and the flow channel g are connected between the limit ring b and the limit ring c of the piston b.

4. The integrated hydraulic reversing valve according to claim 1, characterized in that: When the piston b is located at the bottom of the piston hole, the flow channel a is connected to the flow channel e at the lower part of the piston hole at the bottom of the piston a, and the flow channel e is connected to the oil outlet B. The flow channel a is located between the limit ring b and the limit ring c of the piston b, and the flow channel a and the flow channel e are connected between the limit ring b and the limit ring c of the piston b.

5. The integrated hydraulic reversing valve according to claim 1, characterized in that: When the piston a is located at the top of the piston hole, the flow channel b is connected to the valve core of the reversing pressure regulating valve, the flow channel b is connected to the flow channel f, the flow channel f is connected to the piston hole at the top of the piston c, the flow channel b is located between the limit ring b and the limit ring c of the piston a, and the flow channel b and the flow channel f are connected between the limit ring b and the limit ring c of the piston a.

6. The integrated hydraulic reversing valve according to claim 1, characterized in that: When the piston a is located at the bottom of the piston hole, the flow channel b is connected to the valve core of the reversing pressure regulating valve, the flow channel b is connected to the flow channel h, the flow channel h is connected to the piston hole at the bottom of the piston c, the flow channel b is located between the limit ring b and the limit ring c of the piston a, and the flow channel b and the flow channel h are connected between the limit ring b and the limit ring c of the piston a.

7. The integrated hydraulic reversing valve according to claim 1, characterized in that: When the piston c is at the top of the piston hole, the flow channel a is connected to the flow channel c at the upper part of the piston hole at the top of the piston b, the flow channel a is located between the limiting ring b and the limiting ring c of the piston c, and the flow channel a and the flow channel c are connected between the limiting ring b and the limiting ring c of the piston c.

8. The integrated hydraulic reversing valve according to claim 1, characterized in that: When the piston c is located at the bottom of the piston hole, the flow channel a is connected to the flow channel d at the lower part of the piston hole at the bottom of the piston b, the flow channel a is located between the limit ring b and the limit ring c of the piston c, and the flow channel a and the flow channel d are connected between the limit ring b and the limit ring c of the piston c.

9. The integrated hydraulic reversing valve according to claim 3, characterized in that: The valve core is located in the cavity of the reversing pressure regulating valve and the safety valve, the valve core is in a downward cone shape, the diameter of the valve core and the flow channel match, and the valve core is abutted against the cavity of the reversing pressure valve and the safety valve through a spring.

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