Hydraulic control check valve

Abstract

The utility model relates to a hydraulic control check valve, and belongs to the technical field of check valve equipment. Comprising a valve body, a liquid inlet is formed in one end of the valve body, a liquid outlet is formed in the other end of the valve body, an assembly opening is formed in the circumference of the valve body, a cavity is formed in the valve body, the cavity is communicated with the liquid inlet, the liquid outlet and the assembly opening, a valve seat is installed in the cavity in a threaded mode, a valve deck assembly is installed on the assembly opening in one side of the valve seat, and a jacking column is arranged in the cavity corresponding to the valve deck assembly. When the valve deck assembly makes contact with the top column, fluid in the valve seat can flow unidirectionally, and when the valve deck assembly makes contact with the valve seat, the fluid can be prevented from flowing reversely. The hydraulic control check valve is convenient to disassemble and assemble and simple in structure, the overall sealing performance of the valve body is effectively improved, and the problem that normal sealing is affected due to the fact that the sealing gasket is prone to falling off can be solved.

Description

Technical Field

[0001] The utility model relates to a liquid-controlled check valve, belonging to the technical field of check valve equipment. Background Art

[0002] As a valve body that can make the fluid flow unidirectionally, the liquid-controlled check valve is mainly used to prevent the fluid from flowing back in the pipeline system and is widely used in the fields of petroleum, chemical industry, water supply and drainage, etc. The inventor found in daily use that an assembly hole is provided on the outer circle of the existing liquid-controlled check valve body. The assembly hole communicates with the internal cavity of the valve body. A rotating shaft is inserted into the assembly hole. One end of the rotating shaft extends into the cavity of the valve body. The rotating shaft extending into the cavity of the valve body is hinged with the valve cover, thereby realizing the installation of the valve cover. Since the assembly hole provided on the valve body communicates with the cavity of the valve body, there is a risk of fluid leakage at the position of the assembly hole, resulting in poor overall sealing performance of the valve body. On the other hand, in order to reduce the hard connection between the valve cover and the valve body on the existing valve cover, a disc-shaped gasket is adhered to the valve cover. The gasket is easily detached due to long-term fluid impact and the extrusion of the valve cover and the valve body, thus affecting the normal sealing work of the gasket. Therefore, it is necessary to improve it. Summary of the Invention

[0003] The purpose of the utility model is to provide a liquid-controlled check valve that is convenient for disassembly and assembly, has a simple structure, can effectively improve the overall sealing performance of the valve body, and can reduce the problem that the normal sealing is affected due to the easy detachment of the gasket.

[0004] The technical solution of the utility model is as follows:

[0005] A liquid-controlled check valve includes a valve body, and is characterized in that: a liquid inlet is provided at one end of the valve body, a liquid outlet is provided at the other end of the valve body, an assembly port is provided on the circumference of the valve body, a cavity is provided inside the valve body, the cavity communicates with the liquid inlet, the liquid outlet and the assembly port, a valve seat is installed in the cavity by thread, a valve cover assembly is installed on the assembly port on one side of the valve seat, a top column is provided in the cavity corresponding to the valve cover assembly, when the valve cover assembly contacts the top column, the fluid in the valve seat can flow unidirectionally, and when the valve cover assembly contacts the valve seat, the fluid can be prevented from flowing back.

[0006] The cross-section of the assembly port is circular, the longitudinal section of the assembly port is stepped, and a gland is installed on the assembly port by thread, and the gland is in contact connection with the valve cover assembly.

[0007] The valve seat is in a cylindrical shape, one end face of the valve seat is inclined, and a positioning groove is provided on the circumference of the valve seat.

[0008] The valve cover assembly includes a positioning ring, a rotating shaft is provided on the positioning ring, a valve cover body is hinged on the rotating shaft, a gasket is provided on the end face of the valve cover body, a relief groove is provided on the inner circle of the positioning ring, and a positioning post is provided on the end face of the positioning ring on one side of the valve cover body, and the positioning post is inserted and matched with the positioning groove.

[0009] The described valve cover body is frustum-shaped, and a first clamping groove is provided on the edge of the end face of the valve cover body. A second clamping groove is provided on the valve cover body above the first clamping groove. The sealing gasket is disc-shaped, and a first protrusion is provided on one end face of the sealing gasket. The first protrusion is engaged and clamped with the first clamping groove. A second protrusion is provided on the sealing gasket above the first protrusion. The second protrusion is engaged and clamped with the second clamping groove.

[0010] The described valve cover body is disc-shaped, and a stepped groove is provided on the edge of the end face of the valve cover body. The cross-section of the lowest point of the stepped groove is dovetail-shaped. The sealing gasket is annular, and a stepped protrusion is provided on the edge of one end face of the sealing gasket. The stepped protrusion of the sealing gasket is engaged and clamped with the stepped groove of the valve cover body.

[0011] A buffer concave is provided at the center position of the end face of one end of the described sealing gasket.

[0012] A locking nut is sleeved on the outer circle of the valve body corresponding to the liquid outlet.

[0013] The beneficial effects of the present utility model compared with the prior art are as follows:

[0014] For this liquid-controlled check valve, it is convenient for later staff to disassemble, assemble and overhaul the check valve through the assembly port. Through the mutual cooperation of the positioning ring, rotating shaft, swing arm and valve cover body of the valve cover assembly, the valve cover assembly can be quickly installed, which is convenient for later maintenance and replacement. The valve cover body is limited by the ejector pin to prevent the valve cover body from being too tightly attached to the inner wall of the valve body, which affects the reset of the valve cover body. Through the mutual cooperation of the assembly port with a stepped longitudinal section and the gland, the positioning ring is limited. The buffer concave on the sealing gasket effectively increases the contact area with the fluid, so that the pressure of the fluid on the sealing gasket is smaller, thereby reducing the wear of the sealing gasket and increasing its service life; at the same time, this sealing gasket reduces the deformation amount at the outer circle position of the sealing gasket, further reducing the risk that the deformation at the outer circle position of the sealing gasket is too large and easy to fall off from the valve cover body. This liquid-controlled check valve is convenient for disassembly and assembly, has a simple structure, effectively improves the overall sealing performance of the valve body, and can reduce the problem that the normal sealing is affected due to the easy falling off of the sealing gasket. Description of the Drawings

[0015] Figure 1 It is a sectional structure schematic diagram of the present utility model;

[0016] Figure 2 It is a three-dimensional structure schematic diagram of the valve cover assembly in the present utility model;

[0017] Figure 3 It is a sectional structure schematic diagram of the valve cover body in the present utility model;

[0018] Figure 4 It is a three-dimensional structure schematic diagram of the valve seat in the present utility model;

[0019] Figure 5 This is a schematic cross-sectional view of the improved valve cover body in the present utility model.

[0020] In the figure: 1, valve body; 2, positioning column; 3, liquid inlet; 4, liquid outlet; 5, assembly port; 6, cavity; 7, gland; 8, valve seat; 9, central hole; 10, positioning groove; 11, external thread; 12, positioning ring; 13, rotating shaft; 14, valve cover body; 15, gasket; 16, first card slot; 17, second card slot; 18, first protrusion; 19, second protrusion; 20, ejector pin; 21, relief groove; 22, buffer recess; 23, lock nut; 24, step groove; 25, swing arm. Specific embodiments

[0021] Example 1, as shown in the appendix Figures 1-5 As shown, this liquid-controlled check valve includes a valve body 1. One end of the valve body 1 is provided with a liquid inlet 3, the other end of the valve body 1 is provided with a liquid outlet 4, an assembly port 5 is provided on the circumference of the valve body 1, and a cavity 6 is provided inside the valve body 1. The cavity 6 communicates with the liquid inlet 3, the liquid outlet 4 and the assembly port 5. During operation, the liquid inlet 3 facilitates the inflow of fluid into the cavity 6, the liquid outlet 4 facilitates the outflow of the fluid passing through the cavity 6, and the assembly port 5 facilitates the later disassembly, assembly and maintenance of this check valve by the staff through the assembly port 5.

[0022] The cross-section of the assembly port 5 is circular, and the longitudinal section of the assembly port 5 is stepped. A gland 7 is threadedly installed on the assembly port 5, and the gland 7 is in the shape of a disc. During operation, the gland 7 can seal the assembly port 5, and at the same time, the detachable threaded connection design between the gland 7 and the assembly port 5 facilitates the staff to quickly open the gland 7 later.

[0023] The cavity 6 is in the shape of a conical cylinder. A valve seat 8 is installed with internal threads at one end of the cavity 6. The valve seat 8 is in the shape of a cylinder, and the central hole 9 of the valve seat 8 corresponds to and communicates with the liquid inlet 3 in size. During operation, it is convenient for the fluid in the liquid inlet 3 to enter the central hole 9 of the valve seat 8.

[0024] One end face of the valve seat 8 is inclined. The purpose of this setting is: to facilitate the cooperation between the valve seat 8 and the valve cover assembly, so that the valve plate of the valve cover assembly is inclined. When the fluid flows reversely, the resistance of the valve plate to the fluid is reduced, and the fluid can pass through the central hole 9 of the valve seat 8 more smoothly. When the fluid flows reversely, the inclined valve plate can better fit tightly with the valve seat 8 to form a reliable seal.

[0025] A positioning groove 10 is provided on the circumference of the valve seat 8. An external thread 11 is provided on the outer circle of the valve seat 8 on one side of the positioning groove 10. An internal thread is provided on the inner wall of the cavity 6 corresponding to the external thread 11 of the valve seat 8. The external thread 11 of the valve seat 8 is threadedly connected with the internal thread on the inner wall of the cavity 6.

[0026] A valve cover assembly is installed on the fitting port 5 on one side of the valve seat 8. The valve cover assembly includes a positioning ring 12 which is circular. A rotating shaft 13 is provided on the inner ring of the positioning ring 12. A valve cover body 14 is hinged to the rotating shaft 13 through a swing arm 25. A sealing gasket 15 is provided on the end face of the valve cover body 14. During operation, when the sealing gasket 15 of the valve cover body 14 contacts the end face of one end of the inclined valve seat 8, the sealing gasket 15 seals the central hole 9 of the valve seat 8, preventing fluid from flowing back from the cavity 6 to the central hole 9.

[0027] The valve cover body 14 is frustum-shaped. A first clamping groove 16 is provided on the edge of the end face of the valve cover body 14. A second clamping groove 17 is provided on the valve cover body 14 above the first clamping groove 16. The sealing gasket 15 is disc-shaped. A first protrusion 18 is provided on one end face of the sealing gasket 15. The first protrusion 18 is engaged and clamped with the first clamping groove 16. A second protrusion 19 is provided on the sealing gasket 15 above the first protrusion 18. The second protrusion 19 is engaged and clamped with the second clamping groove 17. During operation, through the engagement and clamping of the first clamping groove 16 with the first protrusion 18 and the engagement and clamping of the second clamping groove 17 with the second protrusion 19, the sealing gasket 15 is clamped on the valve cover body 14.

[0028] A top column 20 is inclinedly arranged in the cavity 6 corresponding to the valve cover body 14 of the valve cover assembly. The top column 20 is cylindrical. During operation, the top column 20 limits the valve cover body 14, preventing the valve cover body 14 from being too tightly attached to the inner wall of the valve body 1 and affecting the reset of the valve cover body 14.

[0029] A relief groove 21 is provided on the inner ring of the positioning ring 12. During operation, it provides a clearance for the hinge point between the swing arm 25 and the rotating shaft 13, facilitating the rotation of the valve cover body 14 around the axis of the rotating shaft 13.

[0030] A positioning post 2 is provided on the end face of the positioning ring 12 on one side of the valve cover body 14. During operation, the positioning post 2 is inserted and fitted with the positioning groove 10, so that the valve seat 8 and the positioning ring 12 are positioned relative to each other, aligning the sealing gasket 15 of the valve cover body 14 on the positioning ring 12 with the inclined surface of the inclined valve seat 8, and the two can better fit and form a seal.

[0031] The fitting port 5 with a stepped longitudinal section limits the positioning ring 12. The gland 7 is in contact connection with the top surface of the positioning ring 12 of the valve cover assembly. During operation, through the mutual cooperation of the fitting port 5 with a stepped longitudinal section and the gland 7, the positioning ring 12 is limited.

[0032] A buffer recess 22 is provided at the center of the end face at one end of the gasket 15. The purpose of this setting is as follows: by means of the buffer recess 22, the contact area with the fluid is effectively increased, so that the pressure of the fluid on the gasket 15 is smaller, thereby reducing the wear of the gasket 15 and increasing its service life; secondly, when the gasket 15 is squeezed by the valve cover body 14 and the valve seat 8, the buffer recess 22 can also make way for the raised edge of the end face of the gasket 15. When the raised part on the end face of the gasket 15 is squeezed, the raised part can extend and deform in the direction of the buffer recess 22 and in the opposite direction of the outer circle of the gasket 15 at the same time. Compared with the traditional disc-shaped gasket 15, this gasket 15 reduces the deformation amount at the outer circle position of the existing gasket 15, and further reduces the risk that the deformation at the outer circle position of the gasket 15 is too large and it is easy to fall off from the valve cover body 14.

[0033] A locking nut 23 is sleeved on the outer circle of the valve body 1 corresponding to the liquid outlet 4, so as to facilitate the connection between the end of the liquid outlet 4 of the valve body 1 and other pipe fittings.

[0034] When this check valve is in use, first connect one end of the liquid inlet 3 of this check valve to the inlet pipe, and then connect one end of the liquid outlet 4 of this check valve to the outlet pipe. When the fluid in the inlet pipe flows into the liquid inlet 3 of this check valve, the fluid will flow from the liquid inlet 3 to the liquid outlet 4 through the cavity 6 of the valve body 1. When the fluid flows from the liquid inlet 3 to the liquid outlet 4, the fluid pressure causes the valve body to open and the fluid passes through smoothly. When the fluid flows from the liquid outlet 4 to the liquid inlet 3, the fluid pressure presses the valve body tightly on the valve seat 8 to prevent the fluid from flowing back. This check valve can be opened or closed under the action of the fluid pressure, and the opening and closing of the valve body are automatic and driven by the pressure difference of the fluid itself.

[0035] As a modification of the valve cover body 14 and the gasket 15 of the present utility model, the valve cover body 14 is disc-shaped, a step groove 24 is provided on the edge of the end face of the valve cover body 14, and the cross section of the lowest point of the step groove 24 is dovetail-shaped. The gasket 15 is annular, a stepped protrusion is provided on the edge of one end face of the gasket 15, and the stepped protrusion of the gasket 15 is engaged with the step groove 24 of the valve cover body 14. The inner circle of the gasket 15 is provided in a stepped shape. The purpose of this setting is as follows: the annular shape of the gasket 15 effectively reduces the manufacturing cost of the gasket 15. At the same time, the fluid is directly in contact with the end face of the valve cover body 14, effectively improving the sealing strength. When the gasket 15 is squeezed by the valve cover body 14 and the valve seat 8, when the raised part on the end face of the gasket 15 is squeezed, the raised part can extend and deform in the direction of the inner circle and in the opposite direction of the outer circle of the gasket 15 at the same time. Compared with the traditional disc-shaped gasket 15, this gasket 15 reduces the deformation amount at the outer circle position of the existing gasket 15, and further reduces the risk that the deformation at the outer circle position of the gasket 15 is too large and it is easy to fall off from the valve cover body 14. The dovetail-shaped step groove 24 can limit the gasket 15.

Claims

1. A hydraulically controlled check valve, comprising a valve body (1), characterized in that: A liquid inlet (3) is provided at one end of the valve body (1), a liquid outlet (4) is provided at the other end of the valve body (1), an assembly port (5) is provided on the circumference of the valve body (1), a cavity (6) is provided inside the valve body (1), the cavity (6) is communicated with the liquid inlet (3), the liquid outlet (4) and the assembly port (5), a valve seat (8) is threadedly mounted inside the cavity (6), a valve cover assembly is mounted on the assembly port (5) on one side of the valve seat (8), a top column (20) is provided in the cavity (6) corresponding to the valve cover assembly, and when the valve cover assembly contacts the top column (20), fluid in the valve seat (8) can flow in one direction, and when the valve cover assembly contacts the valve seat (8), reverse flow of the fluid can be prevented.

2. A hydraulically controlled check valve according to claim 1, characterized in that: The cross section of the assembly opening (5) is circular, the longitudinal section of the assembly opening (5) is stepped, a gland (7) is threadedly mounted on the assembly opening (5), and the gland (7) is in contact connection with the valve cover assembly.

3. A hydraulically controlled check valve according to claim 1, characterized in that: The valve seat (8) is cylindrical, one end surface of the valve seat (8) is arranged in an inclined shape, and a positioning groove (10) is arranged on the circumference of the valve seat (8).

4. A hydraulically controlled check valve according to claim 1, characterized in that: The valve cover assembly comprises a positioning ring (12), a rotating shaft (13) is arranged on the positioning ring (12), a valve cover body (14) is hinged on the rotating shaft (13), a sealing gasket (15) is arranged on the end surface of the valve cover body (14), a clearance groove (21) is arranged on the inner ring of the positioning ring (12), and a positioning column (2) is arranged on the end surface of the positioning ring (12) on one side of the valve cover body (14), and the positioning column (2) is inserted into the positioning groove (10) in cooperation.

5. A hydraulically controlled check valve according to claim 4, characterized in that: The valve cover body (14) is in a truncated cone shape, a first clamping groove (16) is provided on the edge of the end face of the valve cover body (14), a second clamping groove (17) is provided on the valve cover body (14) above the first clamping groove (16), the sealing gasket (15) is in a disc shape, a first protrusion (18) is provided on the end face of one end of the sealing gasket (15), the first protrusion (18) is engaged with the first clamping groove (16), a second protrusion (19) is provided on the sealing gasket (15) above the first protrusion (18), and the second protrusion (19) is engaged with the second clamping groove (17).

6. A hydraulically controlled check valve according to claim 4, characterized in that: The valve cover body (14) is disc-shaped, a step groove (24) is provided on the edge of the end face of the valve cover body (14), the lowest point cross-section of the step groove (24) is dovetail-shaped, the sealing gasket (15) is annular, a step protrusion is provided on the edge of one end face of the sealing gasket (15), and the step protrusion of the sealing gasket (15) is engaged with the step groove (24) of the valve cover body (14).

7. A hydraulically controlled check valve according to claim 5, characterized in that: A buffer recess (22) is provided at the center of the end surface of one end of the sealing gasket (15).

8. The hydraulically controlled check valve according to claim 1, characterized in that: A locking nut (23) is sleeved on the outer circle of the valve body (1) corresponding to the liquid outlet (4).

Images