Ball valve

Abstract

The utility model discloses a ball valve which comprises a valve body, a ball body installed in the valve body, a support installed on the valve body, a valve rod installed on the valve body and connected with the ball body, an actuator installed on the support and connected with the valve rod, a valve seat installed on the valve body and matched with the ball body to form a seal, and an assembling groove formed in the valve body and used for installing the valve seat. A sealing ring moving along with the valve seat is arranged between the valve seat and the assembling groove, the valve seat is provided with a sealing position matched with the ball body to form sealing and a communication position separated from the ball body, a positioning assembly for positioning the valve seat at the sealing position is arranged in the valve body, and a control piece for controlling the positioning assembly is arranged outside the valve body. The valve has the following advantages and effects that emergency conduction can be realized, so that accidents are avoided, and the valve is safer and can be suitable for the high-risk field at the same time.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a ball valve. Background Art

[0002] The opening and closing parts of the ball valve are spheres, which are driven by the valve stem and rotate around the axis of the ball valve. They can also be used for fluid regulation and control. When the through hole on the ball is aligned or staggered with the pipeline axis, the valve is opened or closed. The ball valve should generally be installed horizontally in the pipeline. Ball valves are divided into three types according to the driving method: pneumatic ball valves, electric ball valves, and manual ball valves. The ball valve is mainly composed of valve body, ball, valve stem, valve seat and other components.

[0003] The sealing of the ball valve is mainly achieved by the ball and the valve seat being pressed against each other. For some high-risk fields, if the pipeline cannot be opened in time due to a ball valve failure, it will bury a huge safety hazard. With the development of intelligence, the probability of failure of pneumatic and electric control actuators is much higher than that of traditional mechanical control. When the actuator fails, the existing valve cannot quickly control the rotation of the ball through the valve stem, which will cause a huge safety hazard; thus, the ordinary ball valves currently on the market cannot be applied to some high-risk fields. Based on the above problems, the present invention was conceived. Utility Model Content

[0004] The utility model aims to provide a ball valve which can realize emergency conduction to avoid accidents, making the valve safer and also applicable to high-risk fields.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions: a ball valve, comprising a valve body, a ball installed in the valve body, a bracket installed on the valve body, a valve stem installed on the valve body and connected to the ball, an actuator installed on the bracket and connected to the valve stem, and a valve seat installed on the valve body and cooperating with the ball to form a seal, including an assembly groove formed on the valve body for the valve seat to be installed, a sealing ring that moves with the valve seat is provided between the valve seat and the assembly groove, the valve seat movement has a sealing position that cooperates with the ball to form a seal and a communicating position separated from the ball, a positioning assembly that positions the valve seat in the sealing position is provided on the valve body, and a control component for controlling the positioning assembly is provided outside the valve body.

[0006] By adopting the above technical solution, the positioning assembly positions the valve seat in a sealing position, so that the valve seat can cooperate with the ball to form a seal, thereby satisfying the original sealing and intercepting function of the valve. When the valve is in a sealed state and the actuator fails, the staff controls the positioning assembly to prevent it from positioning the valve seat. The valve seat can be separated from the ball under the action of the fluid pressure, thereby forming an emergency conduction of the fluid medium, avoiding safety hazards caused by the inability to conduct the fluid medium in time, thereby avoiding accidents, making the valve safer and also suitable for high-risk areas. The control component can switch the valve seat from the communicating position back to the sealing position again through the positioning assembly, thereby realizing the recycling of the structure.

[0007] It is further configured as follows: it includes a flow channel formed in the valve body, the assembly groove is arranged in the flow channel, a facing surface for facing the fluid is formed on the valve seat, and the fluid acts on the facing surface to drive the valve seat to switch from the sealing position to the communicating position.

[0008] By adopting the above technical solution, the setting of the impact surface enables the fluid to better act on the valve seat to drive the valve seat to move from the sealing position to the connecting position, thereby ensuring the reliability of the structure and making the valve better suitable for low-pressure working conditions.

[0009] It is further configured as follows: the positioning assembly includes a connecting hole arranged on the valve body and connecting the outside and the assembly groove, a positioning rod sealingly and slidingly arranged in the connecting hole, and a linkage positioning block that moves with the positioning rod to drive the valve seat to move from a communicating position to a sealing position.

[0010] By adopting the above technical solution, the positioning rod drives the linkage positioning block to move, and the linkage positioning block is used to change the direction of force to drive the valve seat to move, thereby achieving the purpose of linkage driving.

[0011] It is further configured that: when the linkage positioning block drives the valve seat to be tightly positioned at the sealing position, the valve seat squeezes the sealing ring, and the linkage positioning block restricts the positioning rod from being separated from the valve body.

[0012] By adopting the above technical solution, this setting structure enables the sealing ring in the sealing position to have a stronger sealing force, so that the sealing ring can achieve a better sealing effect, and this sealing effect does not require the setting of an additional sealing structure, so that the structure has a dual function.

[0013] It is further configured that: the positioning components are symmetrically arranged in two groups along the axis of the valve seat, the control component is a clamp sleeved on the outer peripheral wall of the valve body, and the outer peripheral wall of the valve body is formed with a positioning groove for the clamp to be embedded.

[0014] By adopting the above technical solution, the clamp is tightened to realize the synchronous control of the positioning rods in the two positioning components, which improves the stability and reliability of the structure without increasing the complexity of the control structure, making the structure more feasible.

[0015] It is further configured as follows: a first sealing surface and a second sealing surface are formed on the sealing ring to cooperate with the assembly groove to form a seal, the first sealing surface is located at one end surface of the sealing ring, the second sealing surface is located at the outer circumferential surface of the sealing ring, and a plurality of fixing columns are provided between the inner circumferential surface of the sealing ring and the valve seat, and both ends of each of the fixing columns are respectively inserted into the valve seat and the sealing ring.

[0016] By adopting the above technical solution, the first sealing surface cooperates with the second sealing surface to realize double sealing of the sealing ring, so that the sealing ring has a better sealing effect; and the connection and fixation between the sealing ring and the valve seat are realized by setting a fixing column to improve the fixing strength of the two and avoid the sealing ring from loosening during movement, thereby ensuring the reliability of the structure.

[0017] It is further configured as follows: a sealing packing is provided between the valve stem and the valve body, and the sealing packing includes a packing gasket, a lower flexible graphite packing, a spacer ring, an upper flexible graphite packing and a packing pressure plate from bottom to top; an oil filling hole connecting the outside and the spacer ring is provided on the valve body, a screw plug is threadedly connected to the oil filling hole, an oil through hole connecting the oil filling hole and the valve stem is provided on the spacer ring, and a plurality of oil through holes are distributed around the center of the valve stem.

[0018] By adopting the above technical solution, the lower flexible graphite packing cooperates with the upper flexible graphite packing to realize the double seal of the sealing packing and ensure the sealing effect; and the installation position of the valve stem is positioned by the provided spacer ring to improve the reliability of the valve stem operation. The circumferential oil injection of the valve stem is realized by the provided oil holes and oil injection holes to lubricate the valve stem and improve its service life.

[0019] In summary, the utility model has the following beneficial effects: the utility model can achieve emergency conduction to avoid accidents, making the valve safer and also suitable for high-risk areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment;

[0021] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0022] Figure 3 for Figure 1 Enlarged view of part B in the middle.

[0023] In the figure: 1. valve body; 2. ball; 3. bracket; 4. valve stem; 5. actuator; 6. valve seat; 7. assembly groove; 8. sealing ring; 9. positioning assembly; 91. connecting hole; 92. positioning rod; 93. linkage positioning block; 10. control part; 11. flow channel; 12. impact surface; 13. positioning groove; 14. first sealing surface; 15. second sealing surface; 16. fixing column; 17. sealing packing; 171. packing gasket; 172. lower flexible graphite packing; 173. spacer ring; 174. upper flexible graphite packing; 175. packing pressure plate; 18. oil filling hole; 19. screw plug; 20. oil hole. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] refer to Figures 1 to 3 A ball valve includes a valve body 1, a ball 2 installed in the valve body 1, a bracket 3 fixedly installed on the valve body 1, a valve stem 4 installed on the valve body 1 and connected to the ball 2, an actuator 5 fixedly installed on the bracket 3 and connected to the valve stem 4, and a valve seat 6 installed on the valve body 1 and cooperating with the ball 2 to form a seal. It also includes an assembly groove 7 formed in the valve body 1 for the valve seat 6 to be installed, a sealing ring 8 that moves with the valve seat 6 is provided between the valve seat 6 and the assembly groove 7, and the valve seat 6 has a sealing position that cooperates with the ball 2 to form a seal and a communicating position separated from the ball 2. A positioning component 9 is provided in the valve body 1 to position the valve seat 6 in the sealing position, and a control member 10 for controlling the positioning component 9 is provided outside the valve body 1.

[0026] It includes a flow channel 11 formed in the valve body 1, the assembly groove 7 is formed in the flow channel 11, and a fluid-facing surface 12 is formed on the valve seat 6, and the fluid acts on the facing surface 12 to drive the valve seat 6 to switch from the sealing position to the communication position. The positioning component 9 includes a connecting hole 91 opened in the valve body 1 and connecting the outside and the assembly groove 7, a positioning rod 92 sealingly slidably arranged in the connecting hole 91, and a linkage positioning block 93 integrally arranged on the positioning rod 92 for driving the valve seat 6 to move from the communication position to the sealing position.

[0027] When the linkage positioning block 93 drives the valve seat 6 to be tightly positioned at the sealing position, the valve seat 6 squeezes the sealing ring 8; the linkage positioning block 93 restricts the positioning rod 92 from being separated from the valve body 1. The positioning assembly 9 is symmetrically arranged in two groups along the axis of the valve seat 6, and the control member 10 is a clamp sleeved on the outer peripheral wall of the valve body 1. The outer peripheral wall of the valve body 1 is provided with a positioning groove 13 for the clamp to be embedded.

[0028] The sealing ring 8 is formed with a first sealing surface 14 and a second sealing surface 15 which cooperate with the assembly groove 7 to form a seal. The first sealing surface 14 is located at one end surface of the sealing ring 8 facing the impact surface 12, and the second sealing surface 15 is located at the outer peripheral surface of the sealing ring 8. A plurality of fixing columns 16 are provided between the inner peripheral surface of the sealing ring 8 and the valve seat 6, and the two ends of each fixing column 16 are respectively inserted into the valve seat 6 and the sealing ring 8.

[0029] A sealing packing 17 is provided between the valve stem 4 and the valve body 1. The sealing packing 17 includes a packing gasket 171, a lower flexible graphite packing 172, a spacer ring 173, an upper flexible graphite packing 174 and a packing pressure plate 175 from bottom to top. An oil filling hole 18 connecting the outside with the spacer ring 173 is provided on the valve body 1. A screw plug 19 is threadedly connected to the oil filling hole 18. An oil through hole 20 connecting the oil filling hole 18 and the valve stem 4 is provided on the spacer ring 173. A plurality of oil through holes 20 are distributed around the center of the valve stem 4.

[0030] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A ball valve, comprising a valve body (1), a ball (2) mounted in the valve body (1), a bracket (3) mounted on the valve body (1), a valve stem (4) mounted on the valve body (1) and connected to the ball (2), an actuator (5) mounted on the bracket (3) and connected to the valve stem (4), and a valve seat (6) mounted on the valve body (1) and cooperating with the ball (2) to form a seal, characterized in that: The invention comprises an assembly groove (7) formed in the valve body (1) and for mounting a valve seat (6); a sealing ring (8) is provided between the valve seat (6) and the assembly groove (7) and moves with the valve seat (6); the valve seat (6) has a sealing position for cooperating with the ball (2) to form a seal and a communicating position separated from the ball (2); a positioning component (9) for positioning the valve seat (6) in the sealing position is provided inside the valve body (1); and a control component (10) for controlling the positioning component (9) is provided outside the valve body (1).

2. The ball valve according to claim 1, characterized in that: The valve body (1) comprises a flow channel (11) formed in the valve body (1), the assembly groove (7) being arranged in the flow channel (11), the valve seat (6) being formed with a facing surface (12) for facing the fluid, and the fluid acting on the facing surface (12) is used to drive the valve seat (6) to switch from a sealing position to a communicating position.

3. The ball valve according to claim 2, characterized in that: The positioning assembly (9) comprises a connecting hole (91) provided on the valve body (1) and communicating with the outside and the assembly groove (7), a positioning rod (92) sealingly slidably provided in the connecting hole (91), and a linkage positioning block (93) moving with the positioning rod (92) and used for driving the valve seat (6) to move from a communicating position to a sealing position.

4. The ball valve according to claim 3, characterized in that: When the linkage positioning block (93) drives the valve seat (6) to be tightly positioned at the sealing position, the valve seat (6) squeezes the sealing ring (8), and the linkage positioning block (93) restricts the positioning rod (92) from separating from the valve body (1).

5. The ball valve according to claim 3, characterized in that: The positioning assembly (9) is symmetrically arranged in two groups along the axis of the valve seat (6); the control component (10) is a clamp sleeved on the outer peripheral wall of the valve body (1); and the outer peripheral wall of the valve body (1) is formed with a positioning groove (13) for the clamp to be embedded.

6. The ball valve according to claim 4, characterized in that: The sealing ring (8) is formed with a first sealing surface (14) and a second sealing surface (15) which cooperate with the assembly groove (7) to form a seal. The first sealing surface (14) is located at one end surface of the sealing ring (8), and the second sealing surface (15) is located at the outer peripheral surface of the sealing ring (8). A plurality of fixing columns (16) are provided between the inner peripheral surface of the sealing ring (8) and the valve seat (6), and the two ends of each of the fixing columns (16) are respectively inserted into the valve seat (6) and the sealing ring (8).

7. The ball valve according to claim 1, characterized in that: A sealing packing (17) is provided between the valve stem (4) and the valve body (1), and the sealing packing (17) comprises, from bottom to top, a packing gasket (171), a lower flexible graphite packing (172), a spacer ring (173), an upper flexible graphite packing (174) and a packing pressure plate (175); an oil injection hole (18) communicating with the outside and the spacer ring (173) is provided on the valve body (1), a screw plug (19) is threadedly connected to the oil injection hole (18), and an oil through hole (20) communicating with the oil injection hole (18) and the valve stem (4) is provided on the spacer ring (173), and a plurality of the oil through holes (20) are arranged around the center of the valve stem (4).

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