A large flow pilot-controlled superimposed pressure reducing valve

Abstract

This utility model relates to the field of pressure reducing valve technology, specifically a high-flow pilot-controlled superimposed pressure reducing valve, comprising a pressure reducing valve body, a spring cavity within the valve body, and a spring mounted within the spring cavity via a T-shaped positioning block. The other end of the spring is connected to a pilot valve via a connecting plate. One end of the valve body, facing the pilot valve, has a perforated section, which is connected to a second throttling orifice. The other end of the second throttling orifice is connected to a first throttling orifice. A main valve core is embedded in one end of the valve body, and both the first and second throttling orifices are located within the main valve core. This design achieves rapid and stable control of the outlet pressure, reduces system energy loss, improves pressure regulation accuracy, simplifies the structure, and facilitates superimposed installation in multi-stage hydraulic systems.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, specifically to a high-flow pilot-controlled superimposed pressure reducing valve. Background Technology

[0002] Traditional pressure reducing valves suffer from insufficient dynamic stability, complex structure, and high energy loss. The pilot control oil circuit of the stacked pressure reducing valve is easily affected by pressure interference due to its coupling with the main oil circuit, requiring an additional compensation structure. Furthermore, the pilot oil circuit draws oil directly from the high-pressure main oil circuit, resulting in low energy utilization. The inflexible adjustment of the main valve core movement damping leads to slow response speed, making it difficult to quickly stabilize the outlet pressure under dynamic load or sudden flow changes.

[0003] Existing high-flow pilot-controlled superimposed pressure reducing valves cannot achieve rapid and stable control of outlet pressure, have high system energy loss, low pressure regulation accuracy, complex structure, and are not convenient for superimposed installation in multi-stage hydraulic systems. Utility Model Content

[0004] To address the problems in the existing technology, this utility model provides a high-flow pilot-controlled superimposed pressure reducing valve, which achieves rapid and stable control of the outlet pressure, reduces system energy loss, improves pressure regulation accuracy, simplifies the structure, and facilitates superimposed installation in multi-stage hydraulic systems.

[0005] The technical solution adopted by this utility model to solve its technical problem is a large flow pilot control type superimposed pressure reducing valve, including a flow hood and a pressure reducing valve body. The pressure reducing valve body has a spring cavity and a spring is installed in the spring cavity through a T-shaped positioning block. The other end of the spring is connected to a pilot valve through a connecting plate. One end of the pressure reducing valve body and facing the pilot valve is provided with a hole. The end with the hole is connected to a second throttling hole.

[0006] The other end of the second throttling orifice is connected to the first throttling orifice, and a main valve core is embedded in one end of the pressure reducing valve body. Both the first throttling orifice and the second throttling orifice are located inside the main valve core.

[0007] By adopting the above technical solution, the linkage structure between the main valve core and the pilot valve ensures that the oil drain path is completely isolated from the main oil circuit through the sealing design of the spring cavity, reducing energy loss and enhancing system stability, realizing rapid and stable control of the outlet pressure, reducing system energy loss, improving pressure regulation accuracy, simplifying the structure, and facilitating stacking and installation in multi-stage hydraulic systems.

[0008] Specifically, a third throttling orifice is provided inside the pressure reducing valve body and at one end of the pilot valve.

[0009] By adopting the above technical solution, the pilot valve opens, allowing the oil on the spring loading side to flow into the spring cavity through the independently set third throttle orifice.

[0010] Specifically, the pressure reducing valve body is provided with an oil outlet and an oil inlet at one of its top and bottom ends, respectively.

[0011] Specifically, a drainage cover is connected to the other end of the pressure reducing valve body and closely attached to the T-shaped positioning block.

[0012] Specifically, a sealing ring is provided between the outer side of the drainage hood and the pressure reducing valve body.

[0013] By adopting the above technical solution, the sealing ring ensures the sealing performance between the drainage cover and the pressure reducing valve body.

[0014] Specifically, the sealing ring is made of silicone rubber.

[0015] The beneficial effects of this utility model are:

[0016] (1) The large flow pilot control type superimposed pressure reducing valve of this utility model has a linkage structure between the main valve core and the pilot valve. The sealing design of the spring cavity ensures that the oil drain path is completely isolated from the main oil circuit, reducing energy loss and enhancing system stability. It realizes rapid and stable control of the outlet pressure, reduces system energy loss, improves pressure regulation accuracy, simplifies the structure, and is easy to superimpose and install in a multi-stage hydraulic system. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the oil inlet and oil outlet structures of this utility model.

[0020] In the diagram: 1. Main valve core; 2. With hole; 3. First throttle orifice; 4. Second throttle orifice; 5. Pilot valve; 6. Spring; 7. Third throttle orifice; 8. Spring cavity; 9. Pressure reducing valve body; 10. Oil inlet; 11. Oil outlet; 12. Drain cover; 13. Sealing ring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] To achieve rapid and stable control of the outlet pressure P1, reduce system energy loss, improve pressure regulation accuracy, simplify the structure, and facilitate stacking in multi-stage hydraulic systems, such as... Figure 1-2As shown, the present invention discloses a high-flow pilot-controlled superimposed pressure reducing valve, including a flow hood 12 and a pressure reducing valve body 9. The pressure reducing valve body 9 has a spring cavity 8 and a spring 6 is installed in the spring cavity 8 through a T-shaped positioning block. The other end of the spring 6 is connected to a pilot valve 5 through a connecting plate. One end of the pressure reducing valve body 9 and facing the pilot valve 5 is provided with a hole 2. One end of the hole 2 is connected to a second throttling hole 4.

[0023] The other end of the second throttling orifice 4 is connected to the first throttling orifice 3. The main valve core 1 is embedded in one end of the pressure reducing valve body 9. The first throttling orifice 3 and the second throttling orifice 4 are both located in the main valve core 1.

[0024] During use, the linkage structure between the main valve core 1 and the pilot valve 5 ensures that the oil drain path is completely isolated from the main oil circuit through the sealing design of the spring cavity 8, reducing energy loss and enhancing system stability, realizing rapid and stable control of the outlet pressure P1, reducing system energy loss, improving pressure regulation accuracy, simplifying the structure, and facilitating stacking and installation in multi-stage hydraulic systems.

[0025] For example, such as Figure 1 As shown, the present invention also includes a third throttling orifice 7 provided inside the pressure reducing valve body 9 and at one end of the pilot valve 5.

[0026] When in use, the pilot valve 5 is opened, allowing the oil on the loading side of the spring 6 to flow into the spring chamber 8 through the independently set third throttle hole 7.

[0027] For example, such as Figure 1 , 2 As shown, the present invention also includes an oil outlet 11 and an oil inlet 10 respectively provided at the top and bottom ends of the pressure reducing valve body 9.

[0028] When in use, the oil outlet 11 facilitates connection to P1 and the oil inlet 10 facilitates connection to P2.

[0029] For example, such as Figure 1 As shown, the present invention also includes a drain cover 12 connected to the other end of the pressure reducing valve body 9 and closely attached to the T-shaped positioning block.

[0030] When in use, the drainage cover 12 effectively achieves the effect of drainage.

[0031] For example, such as Figure 1 As shown, the present invention also includes a sealing ring 13 provided between the outer side of the drainage cover 12 and the pressure reducing valve body 9.

[0032] During use, the sealing ring 13 ensures the seal between the drainage cover 12 and the pressure reducing valve body 9.

[0033] For example, such as Figure 1 As shown, the present invention also includes a sealing ring 13 specifically made of silicone rubber material.

[0034] When in use, silicone rubber material has high elasticity, good toughness, high sealing performance, resistance to acid and alkali corrosion, and is durable.

[0035] When in use, the main valve core 1 is kept open in the static position, allowing oil to flow from the second oil passage P2 to the first oil port P1. The loading side of the spring 6 is connected to P1 through the hole 2 and the first throttling hole 3 and the second throttling hole 4 arranged in series, and the pressure of P1 is fed back to both ends of the main valve core 1 in real time to form a dynamic balance.

[0036] When the pressure of P1 exceeds the preset value of spring 6, the pilot valve 5 opens, allowing the oil on the loading side of spring 6 to flow into the spring chamber 8 through the independently set third throttle orifice 7, driving the main valve core to move in the closing direction to limit the flow from P2 to P1, thereby maintaining the constant pressure of P1. The pilot control oil circuit is directly taken from P1 through an independent channel and is isolated from the pressure interference of the main oil circuit. At the same time, through the coordinated design of the first throttle orifice 3, the second throttle orifice 4 and the third throttle orifice 7, the first throttle orifice 3 and the second throttle orifice 4 are used to adjust the motion damping of the main valve core 1 to balance the dynamic response speed.

[0037] The third orifice 7 is used to control the oil discharge flow of the pilot valve 5 to improve the adjustment accuracy. The orifice ratio of the three orifices is optimized according to the hydraulic system operating conditions. In addition, the preload of the spring 6 can be adjusted by an external adjustment mechanism to adapt to different pressure level requirements. The linkage structure between the main valve core 1 and the pilot valve 5 ensures that the oil discharge path is completely isolated from the main oil circuit through the sealing design of the spring cavity 8, reducing energy loss and enhancing system stability. It achieves rapid and stable control of the outlet pressure P1, reduces system energy loss, improves pressure regulation accuracy, simplifies the structure, and facilitates stacking and installation in multi-stage hydraulic systems.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-flow-rate pilot-operated superimposed pressure reducing valve, characterized in that, Includes a drainage cover (12) and a pressure reducing valve body (9). The pressure reducing valve body (9) has a spring cavity (8) and a spring (6) is installed in the spring cavity (8) through a T-shaped positioning block. The other end of the spring (6) is connected to a pilot valve (5) through a connecting plate. One end of the pressure reducing valve body (9) and facing the pilot valve (5) is provided with a hole (2). One end of the hole (2) is connected to a second throttling hole (4). The other end of the second throttling orifice (4) is connected to the first throttling orifice (3). The main valve core (1) is embedded in one end of the pressure reducing valve body (9). The first throttling orifice (3) and the second throttling orifice (4) are both located inside the main valve core (1).

2. The high-flow pilot-controlled superimposed pressure reducing valve according to claim 1, characterized in that, A third throttling orifice (7) is provided inside the pressure reducing valve body (9) and at one end of the pilot valve (5).

3. The high-flow pilot-controlled superimposed pressure reducing valve according to claim 1, characterized in that, The pressure reducing valve body (9) is provided with an oil outlet (11) at one end of the top and an oil inlet (10) at one end of the bottom.

4. A high-flow pilot-controlled superimposed pressure reducing valve according to claim 1, characterized in that, The other end of the pressure reducing valve body (9) is connected to a drain cover (12) that is close to the T-shaped positioning block.

5. A high-flow-rate pilot-controlled superimposed pressure reducing valve according to claim 1, characterized in that, A sealing ring (13) is provided between the outer side of the drainage cover (12) and the pressure reducing valve body (9).

6. A high-flow-rate pilot-controlled superimposed pressure reducing valve according to claim 5, characterized in that, The sealing ring (13) is specifically made of silicone rubber.

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