A pilot relay valve for a control system

Abstract

This utility model relates to the field of pilot-operated relay valves, specifically a pilot-operated relay valve for a control system. The utility model includes a valve body with a first through-hole. A sealing cap is provided at one end of the first through-hole. A first inlet and a second inlet are connected to one side of the first through-hole, and an outlet is connected to the side of the first through-hole away from the first inlet. A control chamber is provided at the end of the first through-hole away from the sealing cap. A piston plate is slidably connected to the control chamber, and a valve core is fixedly connected to the piston plate, extending into the first through-hole. A first locking block is provided within the first through-hole, and a second elastic element is fixedly connected to the sealing cap. A steel ball is provided on the second elastic element, and a second through-hole is provided on the first locking block. A second locking block is provided within the first through-hole, and a third through-hole is provided on the first locking block. A first conical surface is provided within the third through-hole, and a second conical surface is provided on the middle section of the valve core. The technical solution of this utility model can improve the problem of damage to Y-type gaskets after long-term use.

Description

Technical Field

[0001] This utility model relates to the field of pilot relay valve technology, and more specifically, to a pilot relay valve for a control system. Background Technology

[0002] A pilot valve operates based on fluid pressure control. It typically consists of a valve core, a valve seat, and a control chamber. When an external control signal is applied to the control chamber, pressure acts on the main valve core, causing its displacement, thereby adjusting the pressure, flow rate, or flow direction in the fluid system. A relay valve is a pressure amplification and relay device. Its function is to proportionally and rapidly control the charging and discharging of another fluid source based on a pressure signal from a control source, thus efficiently driving large actuators.

[0003] In existing technologies, the main valve core is typically positioned to abut against the Y-type gasket after displacement to ensure effective sealing of the passage. However, with increased usage time, the Y-type gasket may experience fatigue deformation or even breakage due to the impact force from the main valve core displacement. This results in the Y-type gasket needing replacement or repair after approximately 50 opening and closing cycles. Therefore, a pilot-operated relay valve for control systems that can improve the Y-type gasket breakage problem is needed. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a pilot relay valve for control systems, which can improve the problem of Y-type gaskets breaking after long-term use.

[0005] This utility model is achieved through the following technical solution: a pilot relay valve for a control system, including a valve body, a first through hole is provided in the valve body, a sealing cap is provided at one end of the first through hole, a first inlet and a second inlet are connected to one side of the first through hole, an outlet is connected to the side of the first through hole away from the first inlet, a control cavity is provided at the end of the first through hole away from the sealing cap, a piston plate is slidably connected in the control cavity, a first elastic element for driving the piston plate to reset is provided in the control cavity, a valve core is fixedly connected to the piston plate, and the valve core extends into the first through hole;

[0006] A first locking block is provided in the first through hole. The first locking block is located between the first inlet and the outlet. A second elastic element is fixedly connected to the end of the sealing cap near the first locking block. A steel ball is fixedly connected to the end of the second elastic element away from the sealing cap. A second through hole is provided on the first locking block. The steel ball abuts against the second through hole.

[0007] The first through hole is provided with a second locking block, which is located between the second inlet and the outlet. The first locking block is provided with a third through hole, which is provided with a first conical surface. The valve core is provided with a second conical surface in the middle section. The valve core is used to seal the third through hole when the second conical surface and the first conical surface abut against each other. The end of the valve core near the first inlet pushes the steel ball out so that the steel ball is removed from the second through hole.

[0008] Furthermore, both the first and second elastic elements are springs.

[0009] Furthermore, the sealing cap, the first locking block, and the second locking block are all detachably connected to the valve body.

[0010] Furthermore, a first sealing ring is provided between the sealing cap and the valve body.

[0011] Furthermore, a second sealing ring is provided between the first locking block and the valve body.

[0012] Furthermore, a second locking block and a valve body are provided with two rings of third sealing rings.

[0013] Furthermore, a fourth sealing ring is provided between the valve core and the valve body.

[0014] Furthermore, a fifth sealing ring is provided between the piston plate and the control chamber.

[0015] The technical solution of this utility model has at least the following beneficial effects:

[0016] Initially, the valve core does not push the steel ball, the second conical surface and the first conical surface are not in contact, the second inlet and outlet are connected, and fluid can flow from the second inlet into the outlet. However, because the steel ball abuts against the second through hole under the action of the second elastic element, the fluid at the first inlet cannot pass through the second through hole.

[0017] When fluid exceeding a certain pressure value is injected into the control chamber, the piston plate slides a sufficient distance, causing the valve core to push out the steel ball. The steel ball disengages from the second through-hole, and the second conical surface abuts against the first conical surface, sealing the third through-hole. At this point, because the third through-hole is sealed, the fluid entering through the second inlet cannot flow to the outlet. However, after the valve core pushes open the steel ball, the fluid entering through the first inlet can flow to the outlet through the second through-hole.

[0018] In this solution, the original valve core abutting against the Y-type gasket is replaced with a hard seal formed by the abutting of the second and first conical surfaces, thus solving the problem of Y-type gaskets being easily damaged by long-term valve core impact. Both the second and first conical surfaces are made of hard material, making them less prone to breakage compared to Y-type gaskets, significantly increasing maintenance intervals. When the second and first conical surfaces experience fatigue deformation or wear, the valve core will advance a greater distance under the drive of the piston plate, achieving a seal through a larger conical diameter contact, resulting in stronger overall wear resistance. The increased valve core advance only leads to a longer displacement of the steel ball, without affecting the opening and closing effect. Attached Figure Description

[0019] Fig. 1 This is a schematic cross-sectional view of the initial state of an embodiment of the pilot relay valve for the control system of this utility model;

[0020] Fig. 2 This is a cross-sectional view of the valve core after sliding in an embodiment of the pilot relay valve for the control system of this utility model;

[0021] Fig. 3 This is a top view schematic diagram of an embodiment of the pilot relay valve used in the control system of this utility model.

[0022] Reference numerals: 1. Valve body; 2. First through hole; 3. Sealing cap; 4. First inlet; 5. Second inlet; 6. Outlet; 7. Control chamber; 8. Piston plate; 9. First elastic element; 10. Valve core; 11. First locking block; 12. Second elastic element; 13. Steel ball; 14. Second through hole; 15. Second locking block; 16. Third through hole; 17. First conical surface; 18. Second conical surface; 19. First sealing ring; 20. Second sealing ring; 21. Third sealing ring; 22. Fourth sealing ring; 23. Fifth sealing ring. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The following detailed description illustrates the specific implementation method:

[0027] Example 1

[0028] As attached Figs. 1-3 As shown, a pilot relay valve for a control system includes a valve body 1. A first through hole 2 is provided in the valve body 1. A sealing cap 3 is detachably threaded to one end of the first through hole 2. A first sealing ring 19 is provided between the sealing cap 3 and the valve body 1. A first inlet 4 and a second inlet 5 are connected to one side of the first through hole 2. An outlet 6 is connected to the side of the first through hole 2 away from the first inlet 4. A control cavity 7 is provided at the end of the first through hole 2 away from the sealing cap 3. A piston plate 8 is slidably connected in the control cavity 7. A first elastic element 9 for driving the piston plate 8 to reset is provided in the control cavity 7. A valve core 10 is bolted to the piston plate 8. The valve core 10 extends into the first through hole 2.

[0029] A first locking block 11 is detachably connected inside the first through hole 2. The first locking block 11 is located between the first inlet 4 and the outlet 6. A second sealing ring 20 is provided between the first locking block 11 and the valve body 1. A second elastic element 12 is welded and fixed to the end of the sealing cap 3 near the first locking block 11. Both the first elastic element 9 and the second elastic element 12 are springs. A steel ball 13 is welded and fixed to the end of the second elastic element 12 away from the sealing cap 3. A second through hole 14 is provided on the first locking block 11, and the steel ball 13 abuts against the second through hole 14.

[0030] A second locking block 15 is detachably connected inside the first through hole 2. The first locking block 11 is located between the second inlet 5 and the outlet 6. Two third sealing rings 21 are provided between the second locking block 15 and the valve body 1. A third through hole 16 is provided on the first locking block 11. A first conical surface 17 is provided inside the third through hole 16. A second conical surface 18 is provided on the middle section of the valve core 10. The valve core 10 is used to seal the third through hole 16 when the second conical surface 18 and the first conical surface 17 abut against each other. The end of the valve core 10 near the first inlet 4 pushes out the steel ball 13 so that the steel ball 13 is disengaged from the second through hole 14.

[0031] A fourth sealing ring 22 is provided between the valve core 10 and the valve body 1. A fifth sealing ring 23 is provided between the piston plate 8 and the control chamber 7. The first sealing ring 19, the second sealing ring 20, the third sealing ring 21, the fourth sealing ring 22 and the fifth sealing ring 23 are all O-rings.

[0032] In use, the control chamber 7 is connected to an additional control pipeline. The fluid in this pipeline enters the control chamber 7. When the pressure of the fluid in this pipeline increases, it pushes the piston plate 8 to move, causing the valve core 10 to move towards the sealing cap 3. When the pressure of the fluid in this pipeline decreases, the piston plate 8 will reset under the elastic action of the first elastic element 9.

[0033] Initially, the valve core 10 is in an undisplaced state, and therefore does not push the steel ball 13. The second conical surface 18 and the first conical surface 17 are not in contact, and the second inlet 5 is connected to the outlet 6, allowing fluid to flow from the second inlet 5 into the outlet 6. At the first inlet 4, the fluid cannot pass through the second through-hole 14 due to the steel ball 13 blocking the second through-hole 14 under the action of the second elastic element 12, and thus cannot flow to the outlet 6. Similarly, the fluid flowing from the second inlet 5 into the outlet 6 is also blocked by the steel ball 13, preventing it from flowing to the first inlet 4.

[0034] When the fluid injected into the control chamber 7 exceeds a certain pressure value, the piston plate 8 will slide a sufficient distance, causing the valve core 10 to push out the steel ball 13. The steel ball 13 disengages from the second through hole 14, and the second conical surface 18 and the first conical surface 17 abut against each other, sealing the third through hole 16. At this time, because the third through hole 16 is sealed, the fluid entering through the second inlet 5 cannot flow to the outlet 6. However, after the valve core 10 pushes open the steel ball 13, the fluid entering through the first inlet 4 can flow to the outlet 6 through the second through hole 14. Because the third through hole 16 is sealed, the fluid entering through the first inlet 4 cannot flow to the second inlet 5.

[0035] In this embodiment, the original valve core 10 abutting against the Y-shaped gasket is changed to a hard seal formed by the abutting of the second conical surface 18 and the first conical surface 17, thereby solving the problem that the Y-shaped gasket is easily damaged under long-term collisions with the valve core 10. Both the second conical surface 18 and the first conical surface 17 are made of hard material, which is less prone to damage than the Y-shaped gasket, and the maintenance interval is greatly improved. When the second conical surface 18 and the first conical surface 17 undergo fatigue deformation or wear, the valve core 10 will be pushed forward a greater distance under the drive of the piston plate 8, and the seal will be completed through a larger conical diameter contact, making the overall wear resistance stronger. Moreover, the increased distance pushed forward by the valve core 10 will only result in a longer displacement distance of the steel ball 13, without affecting the opening and closing effect.

[0036] The sealing cap 3, the first locking block 11, and the second locking block 15 are all detachably connected to the valve body 1, allowing the pilot relay valve to be manufactured through simple assembly. The first locking block 11 and the second locking block 15 are secured by screwing the sealing cap 3 into the valve body 1, pressing the first locking block 11 and the second locking block 15 tightly into the valve body 1. Both the sealing cap 3 and the first locking block 11 have grooves to maintain fluid flow. Sealing rings are provided on the sealing cap 3, the first locking block 11, and the second locking block 15 to ensure a tight seal after assembly.

[0037] The detachable connection allows the user to maintain the sealing effect of the second locking block 15 by replacing it. Since the second locking block 15 is the main part that bears the impact force of the valve core 10 during use, it is more prone to loosening. Therefore, a two-ring third sealing ring 21 is provided to ensure the sealing effect. Since the third sealing ring 21 does not directly bear the impact force of the valve core 10, there is no need to worry about its service life.

[0038] Leakage may occur on the side of the valve core 10 near the control chamber 7, therefore a fourth sealing ring 22 is provided for sealing. Since the piston plate 8 needs to slide within the control chamber 7 and is driven by fluid pressure, a fifth sealing ring 23 is provided to prevent pressure leakage.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A pilot-operated relay valve for a control system, characterized in that, The valve body (1) includes a first through hole (2) with a sealing cap (3) at one end. A first inlet (4) and a second inlet (5) are connected to one side of the first through hole (2). An outlet (6) is connected to the side of the first through hole (2) away from the first inlet (4). A control cavity (7) is provided at the end of the first through hole (2) away from the sealing cap (3). A piston plate (8) is slidably connected in the control cavity (7). A first elastic element (9) for driving the piston plate (8) to reset is provided in the control cavity (7). A valve core (10) is fixedly connected to the piston plate (8). The valve core (10) extends into the first through hole (2). The first through hole (2) is provided with a first locking block (11), which is located between the first inlet (4) and the outlet (6). The end of the sealing cap (3) near the first locking block (11) is fixedly connected with a second elastic element (12), and the end of the second elastic element (12) away from the sealing cap (3) is fixedly connected with a steel ball (13). The first locking block (11) is provided with a second through hole (14), and the steel ball (13) abuts against the second through hole (14). The first through hole (2) is provided with a second locking block (15). The first locking block (11) is located between the second inlet (5) and the outlet (6). The first locking block (11) is provided with a third through hole (16). The third through hole (16) is provided with a first conical surface (17). The valve core (10) is provided with a second conical surface (18) in the middle section. The valve core (10) is used to seal the third through hole (16) when the second conical surface (18) and the first conical surface (17) abut against each other. The valve core (10) pushes the steel ball (13) out of the second through hole (14) at the end near the first inlet (4).

2. The pilot relay valve for the control system according to claim 1, characterized in that, Both the first elastic element (9) and the second elastic element (12) are springs.

3. The pilot relay valve for the control system according to claim 1, characterized in that, The sealing cap (3), the first locking block (11), and the second locking block (15) are all detachably connected to the valve body (1).

4. The pilot relay valve for the control system according to claim 3, characterized in that, A first sealing ring (19) is provided between the sealing cap (3) and the valve body (1).

5. The pilot relay valve for the control system according to claim 3, characterized in that, A second sealing ring (20) is provided between the first locking block (11) and the valve body (1).

6. The pilot relay valve for the control system according to claim 3, characterized in that, Two third sealing rings (21) are provided between the second locking block (15) and the valve body (1).

7. The pilot relay valve for the control system according to claim 1, characterized in that, A fourth sealing ring (22) is provided between the valve core (10) and the valve body (1).

8. The pilot relay valve for the control system according to claim 1, characterized in that, A fifth sealing ring (23) is provided between the piston plate (8) and the control chamber (7).

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