Priority flow valve

Abstract

The utility model relates to the technical field of priority valves, in particular to a priority flow valve which comprises a valve block and a cartridge valve sleeve, and the valve block is fixedly connected with the cartridge valve sleeve. A port A and a port B are formed in the side face of the valve block. A port P is formed in the bottom of the valve block. A first valve element, a second valve element, a spring, an adjusting rod, an adjusting cap and an elastic check ring are arranged in the cartridge valve sleeve, the first valve element is located on the upper portion of the opening P, the spring is arranged in the first valve element, and the top of the spring abuts against the bottom of the second valve element. The adjusting rod is located above the second valve element, the second valve element and the adjusting rod are sealed in an oblique angle mode under the action of the spring, and an adjusting cap is arranged above the adjusting rod and matched with the top of the cartridge valve sleeve. The device is compact in structure after being structurally improved, stable and reliable in work and capable of being used for a long time, and precision adjustment is achieved; and the priority valve is easy to maintain, and only regular inspection and replacement of the plug-in are needed.

Description

Technical Field

[0001] This application relates to the field of priority valve technology, and more particularly to a priority flow valve. Background Technology

[0002] Priority valves are widely used in hydraulic systems of engineering machinery and shipbuilding industries. For example, in excavators and loaders, priority valves ensure the coordinated operation of multiple actuators. In marine hydraulics, due to the significant vibrations and impacts of the hull, priority valves improve system reliability. However, the accuracy of priority valves in related technologies greatly affects their practical application, and existing priority valve precision control generally suffers from deficiencies. Therefore, priority valve technology in this field has significant limitations and shortcomings. Utility Model Content

[0003] To overcome the shortcomings of related technologies, this application provides a priority flow valve with an improved and compact structure, which can achieve precise adjustment, stable and reliable operation, and can be used for a long time; it is also simple to maintain, requiring only periodic inspection and replacement of the plug-in components.

[0004] A priority flow valve includes a valve block and a cartridge valve sleeve, with the valve block and the cartridge valve sleeve fixedly connected. The valve block has an A port and a B port on its side, and a P port on its bottom. The cartridge valve sleeve and an adjusting cap are fixedly connected. An adjusting rod is provided on the top of the cartridge valve sleeve. A first valve core, a second valve core, and a spring are disposed inside the cartridge valve sleeve. The first valve core is located above the P port, and an elastic retaining ring is provided at the bottom of the first valve core to limit its movement. The outer wall of the second valve core is tightly fitted to the inner wall of the first valve core. A spring is disposed inside the first valve core, with the top of the spring abutting against the bottom of the second valve core, and the bottom of the spring abutting against the bottom of the first valve core.

[0005] The adjusting rod is positioned above the second valve core, and the second valve core and the adjusting rod are sealed at an angle; the adjusting cap is positioned above the adjusting rod; the adjusting rod can be moved up and down for adjustment.

[0006] The cartridge valve sleeve is also provided with a first oil chamber and a second oil chamber; the oil at port A is connected to the first oil chamber where the second valve core is located, and the oil at port P is connected to the second oil chamber where the first valve core is located; the oil at port A can push the second valve core to move downward, and the oil at port P can push the first valve core to move upward; the side wall of the cartridge valve sleeve is also provided with a valve sleeve side hole, which is connected to the B port channel.

[0007] Furthermore, the second oil chamber is located above the P port and is connected to the P port. The second oil chamber contains a first valve core, the outer wall of which is cylindrical and is tightly sealed against the inner wall of the second oil chamber. An annular elastic retaining ring is provided between the second oil chamber and the P port. The first valve core contains a cylindrical inner cavity and a first circular hole at its bottom. A spring is provided in the cylindrical inner cavity. The upper half of the second valve core is located in the first oil chamber, and the outer wall of the lower half of the second valve core is tightly fitted against the inner wall of the first valve core. The first oil chamber is located in the upper half of the first valve core and is connected to the A port channel and the A port.

[0008] Furthermore, a groove is provided on the top of the second valve core, and a second circular hole is provided at the bottom of the groove; an adjusting rod is provided above the groove, and a chamfer is provided at the bottom of the adjusting rod to achieve a chamfered seal between the second circular hole of the second valve core and the adjusting rod.

[0009] Furthermore, when the pressure at port A is too high, exceeding the set value of the adjusting rod, the oil fluid pressure converges in the first oil chamber, pushing the second valve core of the priority flow valve downward, compressing the spring, opening the beveled seal channel, and the oil flows through port A, the port A channel, the first oil chamber, then through the gap between the second round hole and the beveled corner at the bottom of the adjusting rod, the second round hole, the cylindrical inner cavity, and the first round hole, flowing into port P. At the same time, the oil pressure presses the bottom of the first valve core tightly against the elastic retaining ring, and the second oil chamber is filled by the first valve core; when the pressure at port P is greater than that at port A... When the pressure is high, the oil at port P pushes the first valve core upward, compressing the spring. The spring then drives the second valve core upward, eliminating the gap between the second round hole and the chamfered bottom of the adjusting rod. The second round hole and the chamfered bottom of the adjusting rod achieve an angled seal. Simultaneously, when the first valve core moves upward to a certain extent, it opens the valve sleeve side hole, sequentially connecting port P, the second oil chamber, the valve sleeve side hole, the B port channel, and port B, allowing excess fluid to drain from port B. After the pressure at port P decreases, the spring returns to its natural state, and the elastic force resets the first valve core, closing the valve sleeve side hole.

[0010] Furthermore, a limit pin is provided at the top of the cartridge valve sleeve. The limit pin is located between the adjusting cap and the cartridge valve sleeve. After the adjusting rod moves up and down, it is limited by the limit pin. The oblique seal between the adjusting rod and the second valve core drives the second valve core to move up and down.

[0011] Furthermore, the bottom of the cartridge valve sleeve is provided with a valve sleeve main hole, which is connected to the P port.

[0012] Furthermore, the main body of the priority flow valve block is made of galvanized steel, and both the first valve core and the second valve core are made of steel that has been quenched and precision ground.

[0013] Furthermore, the priority flow valve is provided with multiple sealing rings.

[0014] Furthermore, the first valve core and the second valve core are fitted with a clearance.

[0015] Furthermore, the priority flow valve can operate at a pressure of up to 350 bar.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. The integrated design of the priority flow valve in this application results in a simple and compact structure, high reliability, stable and reliable operation, and long-term use.

[0018] 2. The priority flow valve of this application is simple and convenient to maintain, requiring only periodic inspection and replacement of the inserts. The modular valve block structure and plug-in valve components support quick replacement.

[0019] 3. The main body of the priority flow valve block is made of galvanized steel, and the internal parts are made of steel that has been quenched and precision ground, so it has good wear resistance and a long service life; the priority flow valve has a suitable fitting clearance inside, so the leakage is very small; it has good pressure resistance and can work normally at a maximum pressure of 350 bar.

[0020] 4. Both the first and second valve cores employ hydraulic braking to eliminate mechanical shock and prevent internal damage. The priority flow valve in this application serves a safety protection function: when the system pressure exceeds a set value, the priority valve can automatically open to release excessive pressure and prevent system damage.

[0021] 5. The priority flow valve of this application achieves energy saving and consumption reduction: by adjusting the flow rate of the fluid medium, the system can be optimized and precisely controlled, reducing energy consumption and improving production efficiency.

[0022] 6. Oil enters through port A, and the pressure is set via the adjusting rod. Regardless of pressure changes, the priority flow valve maintains a constant flow rate at port A. Excess flow is discharged through port B, which can be used as a secondary working port or a return port to the oil tank. When port B is used as a secondary working port, the pressure must not exceed the pressure at port A. The priority flow valve acts as a check valve, allowing free flow of oil from port A to port P. This application's priority flow valve improves system stability: the priority valve can precisely control the opening sequence of the actuators, thereby improving system stability. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the first oil cavity of the overall structure in an embodiment of this application.

[0024] Figure 2 This is a schematic cross-sectional view of the second oil chamber opening and connecting valve sleeve side hole of the overall structure of this application embodiment.

[0025] Figure 3This is a schematic diagram of the overall oil circuit flow principle in an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Valve block; 2. Cartridge valve sleeve; 3. First valve core; 4. Second valve core; 5. Spring; 6. Adjusting rod; 7. Adjusting cap; 8. Limiting pin; 9. Elastic retaining ring; 10. Valve sleeve side hole; 11. First side hole; 12. Second side hole; 13. Valve sleeve main hole; 14. A-port channel; 15. B-port channel; 16. Groove; 17. First oil chamber; 18. Second oil chamber; 19. First round hole; 20. Second round hole; 21. Sealing ring. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0028] Example 1:

[0029] Reference Figure 1 and Figure 2 This application provides a priority flow valve, including a valve block 1 and a cartridge valve sleeve 2. The valve block 1 and the cartridge valve sleeve 2 are fixedly connected by a plug-in or threaded connection. The valve block 1 has a first side hole 11 and a second side hole 12 on its side, and also has an A port and a B port. The A port connects to the first side hole 11, and the B port connects to the second side hole 12. The A port is vertically higher than the B port. The A port and B port are sequentially arranged, with the axes of the A port and B port located on the same vertical plane and parallel. Because the A port is vertically higher than the B port, their axes do not coincide. The A port channel 14 connected to the A port does not coincide with the axis of the A port, and its axis is higher than that of the A port. The B port channel 15 connected to the B port coincides with the axis of the B port. All these structural arrangements are designed to achieve better propulsion and regulation of the oil pressure. The valve block 1 has a valve sleeve main hole 13 at the bottom and a P port above the valve sleeve main hole 13.

[0030] The cartridge valve sleeve 2 is provided with a first oil chamber 17, a second oil chamber 18, a first valve core 3, a second valve core 4, a spring 5, an adjusting rod 6, and a limiting pin 8. The second oil chamber 18 is located above the P port and communicates with the P port. The first valve core 3 is located inside the second oil chamber 18. The outer wall of the first valve core 3 is cylindrical and is tightly sealed against the inner wall of the second oil chamber 18. An annular elastic retaining ring 9 is provided between the second oil chamber 18 and the P port. When the first valve core 3 moves downward, the elastic retaining ring 9 is used to limit the first valve core 3. At the same time, the inner circumference of the elastic retaining ring 9 communicates with the second oil chamber 18 and the P port. The first valve core 3 has a cylindrical inner cavity. The bottom of the first valve core 3 has a first circular hole 19. The cylindrical inner cavity is provided with a spring 5. The bottom of the spring 5 abuts against the inner wall of the bottom of the first valve core 3, and the top of the spring 5 abuts against the outer wall of the bottom of the second valve core 4, ensuring that the spring 5 moves linearly within the first valve core 3. The upper half of the second valve core 4 is located within the first oil chamber 17, and the outer wall of the lower half of the second valve core 4 is tightly fitted to the inner wall of the first valve core 3 without any gaps. The first oil chamber 17 is located in the upper half of the first valve core 3 and connects to the A-port channel 14 and the A-port. Both the first valve core 3 and the second valve core 4 are hydraulically braked to eliminate mechanical impact and prevent internal damage. The top of the second valve core 4 has a groove 16, and the bottom of the groove 16 has a second circular hole 20. An adjusting rod 6 is located above the groove 16. The bottom of the adjusting rod 6 is cylindrical with a chamfered edge to achieve a chamfered seal between the second circular hole 20 of the second valve core 4 and the adjusting rod 6. An adjusting cap 7 is located above the adjusting rod 6 and is fixedly connected to the top of the cartridge valve sleeve 2. A limit pin 8 is also provided between the adjusting cap 7 and the cartridge valve sleeve 2. The adjusting rod 6 can be moved up and down for adjustment. After adjustment, the adjusting rod 6 is limited by the limit pin 8 and then fixed by the adjusting cap 7. The three components work together to set different pressure ranges. Because the oblique seal between the adjusting rod 6 and the second valve core 4 affects the vertical position of the second valve core 4, the setting and accuracy of the pressure are further controlled.

[0031] The cartridge valve sleeve 2 has a main valve sleeve hole 13 at its bottom, which communicates with port P. The side wall of the cartridge valve sleeve 2 also has a side valve sleeve hole 10, which communicates with port B channel 15. The priority flow valve of this application is adjusted by the regulating rod 6 to achieve energy saving and consumption reduction: by adjusting the flow rate of the fluid medium, optimized and precise control of the system can be achieved, reducing energy consumption and improving production efficiency.

[0032] Under normal pressure, the pressure at port A is greater than that at port P, and port B of the priority flow valve is usually closed, with the preload of spring 5 remaining in its natural state. When the pressure at port A is too high, exceeding the set value of the regulating rod 6, the oil fluid pressure converges in the first oil chamber 17, pushing the second valve core 4 of the priority flow valve downwards, compressing spring 5, opening the beveled seal channel, and the oil flows through port A, port A channel 14, the first oil chamber 17, then through the gap between the second circular hole 20 and the beveled edge at the bottom of the regulating rod 6, the second circular hole 20, the cylindrical inner cavity, and the first circular hole 19, flowing into port P; simultaneously, the oil pressure presses the bottom of the first valve core 3 against the elastic retaining ring 9, and the second oil chamber 18 is filled by the first valve core 3. This application functions as a one-way valve, ensuring the free flow of oil from port A to port P. When the pressure at port P is greater than the pressure at port A, the oil at port P pushes the first valve core 3 upward, compressing the spring 5. The spring 5 then drives the second valve core 4 upward, eliminating the gap between the second circular hole 20 and the chamfered bottom surface of the adjusting rod 6, thus achieving a beveled seal. Simultaneously, when the first valve core 3 moves upward to a certain extent, it opens the valve sleeve side hole 10, sequentially connecting port P, the second oil chamber 18, the valve sleeve side hole 10, the B port channel 15, and port B, allowing excess fluid to drain from port B. After the pressure at port P decreases, the spring 5 returns to its natural state, and its elasticity resets the first valve core 3, closing the valve sleeve side hole 10.

[0033] The priority flow valve in this application serves a safety protection function: when the system pressure exceeds a set value, the priority valve can automatically open to release the excessive pressure and prevent system damage. The pressure is set via the adjusting rod 6, and the priority flow valve can maintain a constant flow rate at port A, regardless of pressure changes; excess flow will be discharged from port B. Port B can be used as a secondary working port or a return port to the oil tank; when port B is used as a secondary working port, the pressure must not exceed the pressure at port A. The priority flow valve also functions as a check valve, allowing free flow of oil from port A to port P.

[0034] The priority flow valve is internally equipped with multiple sealing rings 21. These sealing rings 21 seal the cartridge valve sleeve 2, forming an effective seal between the two contacting parts to prevent liquid leakage and to prevent the intrusion of external dust, moisture, and other impurities, ensuring the normal operation of the priority flow valve. The first valve core 3 and the second valve core 4 are clearance-fitted, achieving a more reliable seal through this fit.

[0035] The main body of the priority flow valve block 1 is made of galvanized steel, and the internal valve core parts, such as the first valve core 3 and the second valve core 4, are made of steel that has been quenched and precision ground, so it has good wear resistance and a long service life; the priority flow valve has a suitable fitting clearance inside, so the leakage is very small; the priority flow valve has good pressure resistance and can work normally at a maximum pressure of 350 bar.

[0036] The working principle of this application embodiment:

[0037] Reference Figure 3 Oil enters through port A, and the pressure is set via adjusting rod 6. Regardless of pressure changes, the priority flow valve maintains a constant flow rate at port A. Excess flow is discharged through port B, which can be used as a secondary working port or a return port to the oil tank. When port B is used as a secondary working port, the pressure must not exceed the pressure at port A. The priority flow valve acts as a check valve, allowing free flow of oil from port A to port P. This application's priority flow valve improves system stability: the priority valve can precisely control the opening sequence of the actuators, thereby improving system stability.

[0038] In summary, the integrated design of the priority flow valve in this application results in a simple and compact structure, high reliability, stable and reliable operation, and long-term usability. Maintenance of the priority flow valve is simple and convenient, requiring only periodic inspection and replacement of inserts. The modular valve block 1 structure and plug-in valve components support quick replacement.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A priority flow valve, characterized in that, Includes a valve block (1) and a cartridge valve sleeve (2), with the valve block (1) and the cartridge valve sleeve (2) fixedly connected; the valve block (1) has an A port and a B port on its side, and a P port at its bottom; the cartridge valve sleeve (2) and the adjusting cap (7) are fixedly connected; the cartridge valve sleeve (2) has an adjusting rod (6) at its top; the cartridge valve sleeve (2) has a first valve core (3), a second valve core (4) and a spring (5) inside; the first valve core (3) is located above the P port, and an elastic retaining ring (9) is provided at the bottom of the first valve core (3) to limit the first valve core (3); the outer wall of the second valve core (4) is tightly fitted to the inner wall of the first valve core (3); the first valve core (3) has a spring (5) inside, with the top of the spring (5) abutting against the bottom of the second valve core (4), and the bottom of the spring (5) abutting against the bottom of the first valve core (3); The adjusting rod (6) is positioned above the second valve core (4), and the second valve core (4) and the adjusting rod (6) are sealed at an angle; the adjusting cap (7) is positioned above the adjusting rod (6); the adjusting rod (6) can move up and down for adjustment; The cartridge valve sleeve (2) is also provided with a first oil chamber (17) and a second oil chamber (18); the oil at port A is connected to the first oil chamber (17) where the second valve core (4) is located, and the oil at port P is connected to the second oil chamber (18) where the first valve core (3) is located; the oil at port A can push the second valve core (4) to move downward, and the oil at port P can push the first valve core (3) to move upward; the side wall of the cartridge valve sleeve (2) is also provided with a valve sleeve side hole (10), and the valve sleeve side hole (10) is connected to the B port channel (15).

2. The priority flow valve according to claim 1, characterized in that, The second oil chamber (18) is located above the P port and is connected to the P port. The second oil chamber (18) is equipped with a first valve core (3). The outer wall of the main body of the first valve core (3) is cylindrical. The outer wall of the first valve core (3) is tightly sealed against the inner wall of the second oil chamber (18). An annular elastic retaining ring (9) is provided between the second oil chamber (18) and the P port. The first valve core (3) is equipped with a cylindrical inner cavity. The bottom of the first valve core (3) is equipped with a first circular hole (19). The cylindrical inner cavity is equipped with a spring (5). The upper half of the second valve core (4) is located in the first oil chamber (17). The outer wall of the lower half of the second valve core (4) is tightly fitted against the inner wall of the first valve core (3). The first oil chamber (17) is located in the upper half of the first valve core (3). The first oil chamber (17) is connected to the A port channel (14) and the A port.

3. A priority flow valve according to claim 2, characterized in that, The second valve core (4) has a groove (16) at the top and a second round hole (20) at the bottom of the groove (16); an adjusting rod (6) is provided above the groove (16) and a chamfered surface is provided at the bottom of the adjusting rod (6) to achieve a chamfered seal between the second round hole (20) of the second valve core (4) and the adjusting rod (6).

4. A priority flow valve according to claim 3, characterized in that, When the pressure at port A is too high, exceeding the set value of the adjusting rod (6), the oil fluid pressure converges in the first oil chamber (17), pushing the second valve core (4) of the priority flow valve downward, compressing the spring (5), opening the oblique sealing channel, and the oil flows through port A, port A channel (14), the first oil chamber (17), and then through the gap between the second round hole (20) and the chamfered bottom of the adjusting rod (6), the second round hole (20), the cylindrical inner cavity, and the first round hole (19), flowing into port P. At the same time, the oil pressure presses the bottom of the first valve core (3) against the elastic retaining ring (9), and the second oil chamber (18) is filled by the first valve core (3); when the pressure at port P is greater than the pressure at port A, The oil at port P pushes the first valve core (3) upward, compressing the spring (5). The spring (5) drives the second valve core (4) upward. The gap between the second round hole (20) and the bottom chamfer of the adjusting rod (6) no longer exists. The second round hole (20) and the bottom chamfer of the adjusting rod (6) achieve a bevel seal. At the same time, when the first valve core (3) moves upward to a certain extent, the valve sleeve side hole (10) is opened, connecting port P, the second oil chamber (18), the valve sleeve side hole (10), the B port channel (15), and port B in sequence, so that excess fluid is discharged from port B. After the pressure at port P decreases, the spring (5) returns to its natural state, and the elastic force resets the first valve core (3), closing the valve sleeve side hole (10).

5. A priority flow valve according to claim 3, characterized in that, The top of the cartridge valve sleeve (2) is also provided with a limiting pin (8). The limiting pin (8) is located between the adjusting cap (7) and the cartridge valve sleeve (2). After the adjusting rod (6) moves up and down, it is limited by the limiting pin (8). The oblique seal between the adjusting rod (6) and the second valve core (4) drives the second valve core (4) to move up and down.

6. A priority flow valve according to claim 1, characterized in that, The bottom of the cartridge valve sleeve (2) is provided with a valve sleeve main hole (13), which is connected to the P port.

7. A priority flow valve according to claim 1, characterized in that, The main body of the priority flow valve block (1) is made of galvanized steel, and the first valve core (3) and the second valve core (4) are both made of steel that has been quenched and finely ground.

8. A priority flow valve according to claim 1, characterized in that, The priority flow valve is provided with multiple sealing rings (21).

9. A priority flow valve according to claim 1, characterized in that, The first valve core (3) and the second valve core (4) are fitted with a clearance.

10. A priority flow valve according to claim 1, characterized in that, The priority flow valve can operate at a maximum pressure of 350 bar.

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