Bidirectional hard sealing ball valve

Abstract

The utility model relates to a two-way hard sealing ball valve, which belongs to the technical field of ball valves and comprises an inlet valve body (25) and an outlet valve body (26) which are closed to form a valve cavity. The two valve seats (12) are respectively arranged at an inlet and an outlet of the valve cavity; the sealing assembly is arranged on the valve seat (12) in a sleeving mode and comprises a sealing ring (11), a supporting ring (10) and a pre-tightening piece which are sequentially arranged from inside to outside. Compared with the prior art, through the combined action of the sealing ring, the supporting ring and the pre-tightening piece, the valve body and the valve seat are tightly attached, the sealing performance is good, powder in the flow channel can be effectively sealed in a dustproof mode while sealing of the sealing ring is achieved, and the working reliability and stability of the ball valve are improved.

Description

Technical Field

[0001] The utility model relates to the field of ball valves, in particular to a two-way sealing hard sealing ball valve. Background Art

[0002] A ball valve is a valve that controls the flow of fluid by rotating the ball. A ball valve usually uses a ball as the closing piece inside the valve body, and a circular hole is provided on the ball. When the hole is aligned with the axis of the pipe, the valve is in the open state; when the ball rotates so that the hole is perpendicular to the axis of the pipe, the valve is in the closed state.

[0003] Ball valves can be divided into three categories according to their structure: floating ball valves, fixed ball valves and elastic ball valves. Among them, the ball of the fixed ball valve is fixed and will not move after being pressurized. It can withstand the erosion of the medium well during the opening and closing process, so it is widely used in the field of fixed particles and abrasive media. Existing fixed ball valves all have floating valve seats. After being subjected to medium pressure, the valve seat moves to press the sealing ring tightly against the ball to ensure sealing. However, it is difficult to stably ensure the reliability and effectiveness of the seal by relying solely on medium pressure, especially in a low-pressure working environment, which will directly affect the reliability and stability of the ball valve. Utility Model Content

[0004] The purpose of the utility model is to provide a bidirectional sealing hard sealing ball valve in order to overcome at least one of the defects in the prior art.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A two-way sealing hard sealing ball valve, comprising:

[0007] The inlet valve body and the outlet valve body, the area enclosed by the two is the valve cavity;

[0008] Two valve seats are respectively arranged at the inlet and outlet of the valve cavity;

[0009] The sealing assembly sleeved on the valve seat comprises a sealing ring, a support ring and a pre-tightening member which are arranged in sequence from the inside to the outside.

[0010] Furthermore, the preload member includes a spring ring and a spring arranged in the spring ring.

[0011] Furthermore, a sphere is also arranged in the valve cavity; a valve stem is arranged on the top of the sphere and passes through the top of the inlet valve body, and the valve stem is connected to the top of the sphere by a four-way transmission; a stuffing box is arranged between the valve stem and the inlet valve body, and the stuffing box also extends between the valve stem and the sphere; a second shaft sleeve is arranged between the sphere and the stuffing box; a bottom shaft is arranged on the bottom of the sphere and passes through the bottom of the inlet valve body, and the bottom shaft is coaxial with the valve stem, and one end of the bottom shaft is connected to the bottom of the sphere; a first shaft sleeve is arranged between the bottom shaft and the sphere.

[0012] Furthermore, the valve stem is a reducing stem, and a third sleeve is arranged between the reducing stem and the stuffing box, and the third sleeve abuts against the reducing portion of the valve stem.

[0013] Furthermore, a thrust pad is provided between the third shaft sleeve and the diameter-changing portion of the valve stem.

[0014] Furthermore, a packing is arranged between the valve stem and the valve body; and the packing pressure plate is sleeved on the valve stem to compress the packing.

[0015] Furthermore, a packing pressing sleeve is sleeved on the stem of the valve stem located between the packing pressing plate and the packing.

[0016] Furthermore, a bracket is provided on the top of the ball valve, and the bracket is connected to the inlet valve body by bolts.

[0017] Furthermore, an actuator is arranged above the bracket.

[0018] Furthermore, the stuffing box and the inlet valve body are connected by bolts, and a third gasket is provided at the abutment between the two.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] (1) The utility model provides a two-way hard-sealed ball valve. Through the joint action of the sealing ring, the support ring and the preload member, the valve body and the valve seat are tightly fitted and have good sealing performance. While achieving the sealing of the sealing ring, the powder in the flow channel can also be effectively sealed against dust, thereby improving the reliability and stability of the ball valve.

[0021] (2) The utility model provides a two-way sealed hard-sealed ball valve, which is provided with a valve stem penetrating the top of the valve body, one end of which is connected to the top of the ball; a stuffing box is provided between the valve stem and the valve body, and the stuffing box also extends between the valve stem and the ball; a second shaft sleeve is provided between the ball and the stuffing box; a bottom shaft penetrating the bottom of the valve body is also provided, which is coaxial with the valve stem and one end of which is connected to the bottom of the ball; a first shaft sleeve is provided between the bottom shaft and the ball. When the ball and the valve seat are in a closed state, the pressure of the medium is borne by the stuffing box and the bottom shaft, which reduces the torque that must be applied to open or close the valve.

[0022] (3) The utility model provides a two-way sealed hard-sealed ball valve, whose valve stem and packing, stuffing box, packing sleeve and packing pressure plate form a sealing combination, and the packing pressure plate applies pressure to the packing sleeve, and then the packing sleeve presses the packing to achieve valve stem sealing.

[0023] (4) The utility model provides a bidirectional hard-sealed ball valve, a bracket is also provided on the top of which an actuator is provided above the bracket. The transmission of the actuator structure does not affect the seal between the stuffing box and the valve body, making the performance of the invention more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a wear-resistant hard-sealed fixed ball valve in an embodiment;

[0025] Figure 2 for Figure 1 Partial view of area A in the middle;

[0026] Figure 3 for Figure 1 Partial view of area B in the middle;

[0027] Figure 4 for Figure 1 Partial view of the middle C area;

[0028] As shown in the figure: 1-bottom shaft; 2-first gasket; 3-first sleeve; 4-ball; 5-second gasket; 6-stud; 7-nut; 8-spring ring; 9-spring; 10-support ring; 11-sealing ring; 12-valve seat; 13-valve stem; 14-second sleeve; 15-stuffing box; 16-thrust pad; 17-third sleeve; 18-third gasket; 19-packing; 20-screw; 21-packing sleeve; 22-bolt; 23-packing plate; 24-bracket; 25-inlet valve body; 26-outlet valve body. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0030] Example

[0031] See also Figure 1-4 A two-way hard-sealed ball valve comprises: an inlet valve body 25 and an outlet valve body 26, the area enclosed by the two is a valve cavity; two valve seats 12 are respectively arranged at the inlet and outlet of the valve cavity; a sealing component sleeved on the valve seat 12, which comprises a sealing ring 11, a support ring 10 and a preloaded member arranged in sequence from the inside to the outside.

[0032] Please refer to Figure 1 , Figure 3 In this embodiment, the preload member includes a spring ring 8 and a spring 9 arranged in the spring ring 8.

[0033] Please refer to Figure 1 In this embodiment, a ball 4 is also provided in the valve cavity; a valve stem 13 penetrating the top of the inlet valve body 25 is provided on the top of the ball 4, and the valve stem 13 is connected to the top of the ball 4 by a four-way transmission; a stuffing box 15 is provided between the valve stem 13 and the inlet valve body 25, and the stuffing box 15 also extends between the valve stem 13 and the ball 4; a second shaft sleeve 14 is provided between the ball 4 and the stuffing box 15; a bottom shaft 1 penetrating the bottom of the inlet valve body 25 is provided at the bottom of the ball 4, the bottom shaft 1 is coaxial with the valve stem 13, and one end of the bottom shaft 1 is connected to the bottom of the ball 4; a first shaft sleeve 3 is provided between the bottom shaft 1 and the ball 4; the stuffing box 15 and the valve body 25 are connected by bolts, and a third gasket 18 is provided at the abutment between the two.

[0034] Please refer to Figure 1 In this embodiment, the valve stem 13 is a reducing rod, and a third sleeve 17 is arranged between the valve stem 13 and the stuffing box 15, and the third sleeve 17 abuts against the reducing portion of the valve stem 13; a thrust pad 16 is arranged between the third sleeve 17 and the reducing portion of the valve stem 13; a packing 19 is arranged between the valve stem 13 and the valve body 25; the packing pressure plate 23 is sleeved on the valve stem 13 for pressing the packing 19; a packing pressing sleeve 21 is sleeved on the stem of the valve stem 13 between the packing pressure plate 23 and the packing 19.

[0035] Please refer to Figure 1 In this embodiment, a bracket 24 is further provided on the top of the ball valve, and the bracket 24 is connected to the inlet valve body 25 by bolts; an actuator is provided above the bracket 24.

[0036] Working principle:

[0037] The ball valve of this embodiment makes the valve body and the valve seat fit tightly through the joint action of the sealing ring, the support ring and the pre-tightening member, and has good sealing performance. While achieving the sealing of the sealing ring, it can also effectively seal the powder in the flow channel from dust, thereby improving the reliability and stability of the ball valve. In addition, the valve stem 13 of the ball valve forms a sealing combination with the packing 19, the packing box 15, the packing gland 21, and the packing pressing plate 23. The packing gland 21 is pressed by the packing pressing plate 23, and then the packing gland 21 presses the packing 19 to achieve the valve stem sealing. In addition, the ball valve of this embodiment is provided with a valve stem 13 that passes through the top of the inlet valve body 25, one end of which is connected to the top of the ball 4; a stuffing box 15 is provided between the valve stem 13 and the valve body 25, and the stuffing box 15 also extends between the valve stem 13 and the ball 4; a second shaft sleeve 14 is provided between the ball 4 and the stuffing box 15; a bottom shaft 1 that passes through the bottom of the valve body 25 is also provided, which is coaxial with the valve stem 13 and one end of which is connected to the bottom of the ball 4; a first shaft sleeve 3 is provided between the bottom shaft 1 and the ball 4. When the ball and the valve seat are in a closed state, the pressure of the medium is borne by the stuffing box 15 and the bottom shaft 1, which reduces the torque that must be applied to open or close the valve.

[0038] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A two-way sealing hard sealing ball valve, characterized in that: include: The inlet valve body (25) and the outlet valve body (26) form a closed area called a valve cavity. Two valve seats (12) are respectively arranged at the inlet and outlet of the valve cavity; A sealing assembly sleeved on a valve seat (12) comprises a sealing ring (11), a support ring (10) and a pre-tightening member which are arranged in sequence from the inside to the outside.

2. A bidirectional sealing hard sealing ball valve according to claim 1, characterized in that: The pre-tightening member comprises a spring ring (8) and a spring (9) arranged in the spring ring (8).

3. A bidirectional sealing hard sealing ball valve according to claim 1, characterized in that: A sphere (4) is also disposed in the valve cavity; A valve stem (13) is provided at the top of the sphere (4) and passes through the top of the inlet valve body (25), and the valve stem (13) is connected to the top of the sphere (4) by a four-way transmission; a stuffing box (15) is provided between the valve stem (13) and the inlet valve body (25), and the stuffing box (15) also extends between the valve stem (13) and the sphere (4); a second shaft sleeve (14) is provided between the sphere (4) and the stuffing box (15); The bottom of the sphere (4) is provided with a bottom shaft (1) penetrating the bottom of the inlet valve body (25); the bottom shaft (1) is coaxial with the valve stem (13), and one end of the bottom shaft (1) is connected to the bottom of the sphere (4); a first shaft sleeve (3) is provided between the bottom shaft (1) and the sphere (4).

4. A bidirectional sealing hard sealing ball valve according to claim 3, characterized in that: The valve stem (13) is a diameter-reducing stem, and a third shaft sleeve (17) is arranged between the valve stem and the stuffing box (15), and the third shaft sleeve (17) abuts against a diameter-reducing portion of the valve stem (13).

5. A bidirectional sealing hard sealing ball valve according to claim 4, characterized in that: A thrust pad (16) is provided between the third shaft sleeve (17) and the diameter-changing portion of the valve stem (13).

6. A bidirectional sealing hard sealing ball valve according to claim 3, characterized in that: A packing (19) is arranged between the valve stem (13) and the valve body (25), and a packing pressure plate (23) is also sleeved on the valve stem (13), wherein the packing pressure plate (23) is used to press the packing (19).

7. A bidirectional sealing hard sealing ball valve according to claim 6, characterized in that: The valve stem (13) is located between the packing pressure plate (23) and the packing (19), and a packing pressure sleeve (21) is sleeved on the stem.

8. A bidirectional sealing hard sealing ball valve according to claim 3, characterized in that: The stuffing box (15) and the inlet valve body (25) are connected via bolts, and a third gasket (18) is provided at the abutment between the two.

9. A bidirectional sealing hard sealing ball valve according to claim 1, characterized in that: A bracket (24) is also provided on the top of the ball valve, and the bracket (24) is connected to the inlet valve body (25) by bolts.

10. A bidirectional sealing hard sealing ball valve according to claim 9, characterized in that: An actuator is arranged above the bracket (24).

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