Anti-overpressure ball valve capable of automatically adjusting internal pressure

Abstract

The anti-overpressure ball valve with the internal pressure automatically adjusted comprises a valve ball and a valve body, the valve ball is arranged in the valve body, and the anti-overpressure ball valve is characterized in that a pressure relief hole is formed in the surface of the valve ball, a pressure relief valve is arranged in the pressure relief hole, a pressure adjusting mechanism is arranged on the pressure relief valve, a valve body sealing cover is arranged at the position, corresponding to the pressure relief hole, of the valve body, and the pressure relief valve can be adjusted after the valve body sealing cover is opened. The pressure relief valve has the advantages that the pressure relief valve is arranged on the surface of the valve ball, the function of pressure relief in a ball valve cavity is achieved, the situation that the pressure in the cavity is too large is avoided, the pressure relief pressure value can be further adjusted after the ball valve is on line, and the pressure relief effect is better.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and particularly relates to an overpressure-proof ball valve with autonomous internal pressure regulation. Background Technique

[0002] A ball valve is a commonly used valve that controls the flow of fluid through a rotating sphere. When the sphere is aligned with the pipeline axis, the fluid can pass through; when the sphere rotates 90 degrees and is perpendicular to the pipeline axis, the fluid is blocked. This design enables the ball valve to have fast opening and closing and good sealing performance.

[0003] For ball valves with a diameter greater than 200 mm, an automatic pressure relief device is used to solve the problem of increased internal pressure in the valve cavity. Most conventional ball valves generally choose to add a relief valve on the valve body to release the internal pressure of the valve cavity. However, for ball valves used in LNG, since they are used in cryogenic working conditions, if the pressure is released to the outside, it will have an impact on the environment and safety. Therefore, an automatic relief valve with a one-way conduction function needs to be installed on the sphere to release the valve cavity pressure to the upstream and downstream pipelines.

[0004] The existing internal pressure relief methods usually do not have an adjustment function, resulting in unsatisfactory pressure relief differences. Content of the Utility Model

[0005] To solve the above problems, the utility model provides an overpressure-proof ball valve with autonomous internal pressure regulation, which can adjust the internal pressure relief value of the valve without removing the valve ball.

[0006] The overpressure-proof ball valve with autonomous internal pressure regulation includes a valve ball and a valve body. The valve ball is arranged in the valve body. It is characterized in that a pressure relief hole is arranged on the surface of the valve ball, a pressure relief valve is arranged in the pressure relief hole, a pressure adjustment mechanism is arranged on the pressure relief valve, and a valve body cover is arranged at the position corresponding to the pressure relief hole of the valve body. After the valve body cover is opened, the pressure relief valve can be adjusted.

[0007] Further, the pressure relief hole includes a mounting hole and a pressure relief branch hole. The pressure relief valve is installed in the mounting hole, and the pressure relief branch hole penetrates from the inner wall of the pressure relief hole to the surface of the valve ball.

[0008] Further, the mounting hole is in a "T" shape. The side close to the outer wall of the valve ball is the outer hole, and the side close to the inner wall of the valve ball is the inner hole. The diameter of the outer hole is larger than that of the inner hole, and the inner wall of the outer hole is provided with a thread structure.

[0009] Further, the pressure relief valve includes an adjusting nut, a movable block and a return spring. The adjusting nut is arranged at the outer hole, the movable block is arranged at the inner hole, and the return spring is arranged between the adjusting nut and the movable block.

[0010] Further, a limiting step is arranged at one end of the movable block close to the adjusting nut. In the natural state, the limiting step abuts against the bottom of the outer hole under the action of the return spring.

[0011] Further, in the natural state, the outer wall of the movable block completely blocks the inlet of the pressure relief branch hole.

[0012] Further, a sealing ring is also provided at the end of the movable block, and the sealing ring is pressed against the inner wall of the pressure relief branch hole.

[0013] Further, the sealing ring is made of polychlorotrifluoroethylene.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. By providing a pressure relief valve on the surface of the valve ball, the function of pressure relief in the ball valve cavity is realized, avoiding excessive pressure in the cavity, damaging the ball valve, and even causing accidents.

[0016] 2. The pressure relief valve is a pressure-adjustable pressure relief valve, which can further adjust the pressure relief value after the ball valve is put into operation, making the pressure relief effect better.

[0017] 3. Adjusting the pressure relief value of the pressure relief valve does not require removing the valve ball. It can be completed only by opening the valve body cover and using an internal hexagon wrench tool, which is very convenient and fast. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the valve ball in the anti-overpressure ball valve with autonomous internal pressure regulation of the present utility model.

[0019] Figure 2 It is a schematic cross-sectional view of the pressure regulating mechanism in the anti-overpressure ball valve with autonomous internal pressure regulation of the present utility model.

[0020] Figure 3 It is a partial cross-sectional view of the valve seat and the pressure regulating mechanism in the anti-overpressure ball valve with autonomous internal pressure regulation of the present utility model.

[0021] Reference numerals: valve ball 1, pressure relief branch hole 2, adjusting nut 3, return spring 4, outer hole 5, inner hole 6, movable block 7, sealing ring 8, valve body 9, valve body cover 10. Detailed Embodiments

[0022] Next, in combination with the drawings and reference numerals, the shape and structure in the embodiments of the utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] The overpressure - preventing ball valve with autonomous internal - pressure regulation includes a valve ball 1 and a valve body 9. The valve ball 1 is arranged inside the valve body 9. It is characterized in that a pressure - relief hole is provided on the surface of the valve ball 1, a pressure - relief valve is arranged in the pressure - relief hole, a pressure - regulation mechanism is arranged on the pressure - relief valve, and a valve - body cover 10 is provided at the position of the valve body 9 corresponding to the pressure - relief hole. After opening the valve - body cover 10, the pressure - relief valve can be adjusted. The pressure - relief hole includes a mounting hole and a pressure - relief branch hole 2. The pressure - relief valve is installed in the mounting hole, and the pressure - relief branch hole 2 penetrates from the inner wall of the pressure - relief hole to the surface of the valve ball 1. The mounting hole is in a "T" shape. The side close to the outer wall of the valve ball 1 is an outer hole 5, and the side close to the inner wall of the valve ball 1 is an inner hole 6. The diameter of the outer hole 5 is larger than that of the inner hole 6, and the wall of the outer hole 5 is provided with a threaded structure. The pressure - relief valve includes an adjusting nut 3, a movable block 7, and a return spring 4. The adjusting nut 3 is arranged at the outer hole 5, the movable block 7 is arranged at the inner hole 6, and the return spring 4 is arranged between the adjusting nut 3 and the movable block 7. A limiting step is provided at one end of the movable block 7 close to the adjusting nut 3. In the natural state, the limiting step abuts against the bottom of the outer hole 5 under the action of the return spring 4. In the natural state, the outer wall of the movable block 7 completely blocks the inlet of the pressure - relief branch hole 2. A sealing ring 8 is also provided at the end of the movable block 7, and the sealing ring 8 is pressed against the inner wall of the pressure - relief branch hole 2. The sealing ring 8 is made of polychlorotrifluoroethylene.

[0024] During actual use, when the ball valve is opened and the pipeline is in a through - state, when the pressure in the pipeline increases, a thrust is gradually applied to the movable block 7 in the pressure - relief valve. When the thrust overcomes the pressure of the return spring 4, part of the pressure - relief branch hole 2 is exposed and pressure relief starts. When the pressure of the return spring 4 is greater than the pressure in the cavity, the movable block 7 blocks the inlet of the pressure - relief branch hole 2 again.

[0025] Pressure regulation: After the ball valve is put into use, if it is found that the pressure - relief pressure value is inaccurate or unreasonable, the valve - body cover 10 on the valve body 9 is removed, and an inner - hexagon wrench is inserted into the interior of the valve body 9 to cooperate with the adjusting nut 3. Tightening the inner - hexagon nut further increases the pressure - relief value, and loosening the inner - hexagon nut decreases the pressure - relief value.

[0026] Since the application environment where cavity pressure relief is required, such as for LNG medium, usually needs to be carried out in a low - temperature environment, this structure is mainly used in combination with cryogenic ball valves. Therefore, the sealing ring 8 can be made of polychlorotrifluoroethylene, which has the effect of resisting low temperature.

[0027] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above - mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non - restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model.

Claims

1. An anti-overpressure ball valve with self-regulating internal pressure, comprising a valve ball and a valve body, wherein the valve ball is arranged in the valve body, and is characterized in that: A pressure relief hole is provided on the surface of the valve ball, a pressure relief valve is provided in the pressure relief hole, a pressure regulating mechanism is provided on the pressure relief, and a valve body cover is provided at the position corresponding to the pressure relief hole of the valve body. After the valve body cover is opened, the pressure relief valve can be adjusted.

2. The anti-overpressure ball valve with self-regulating internal pressure according to claim 1, characterized in that: The pressure relief hole includes a mounting hole and a pressure relief branch hole. The pressure relief valve is installed in the mounting hole. The pressure relief branch hole runs through the inner wall of the pressure relief hole to the surface of the valve ball.

3. The anti-overpressure ball valve with self-regulating internal pressure according to claim 2, characterized in that: The mounting hole is in a "T" shape, with the side close to the outer wall of the valve ball being the outer hole and the side close to the inner wall of the valve ball being the inner hole. The diameter of the outer hole is larger than the diameter of the inner hole, and a threaded structure is provided on the wall of the outer hole.

4. The anti-overpressure ball valve with self-regulating internal pressure according to claim 3 is characterized in that: The pressure relief valve comprises an adjusting nut, a movable block and a reset spring. The adjusting nut is arranged at the outer hole, the movable block is arranged at the inner hole, and the reset spring is arranged between the adjusting nut and the movable block.

5. The anti-overpressure ball valve with self-regulating internal pressure according to claim 4, characterized in that: A limiting step is arranged at one end of the movable block close to the adjusting nut. In a natural state, the limiting step is pressed against the bottom of the outer hole by the action force of the reset spring.

6. The anti-overpressure ball valve with self-regulating internal pressure according to claim 5, characterized in that: Under natural conditions, the outer wall of the movable block completely blocks the entrance of the pressure relief branch hole.

7. The anti-overpressure ball valve with self-regulating internal pressure according to claim 6, characterized in that: A sealing ring is also provided at the end of the movable block, and the sealing ring is pressed tightly against the inner wall of the pressure relief branch hole.

8. The anti-overpressure ball valve with self-regulating internal pressure according to claim 7, characterized in that: The sealing ring is made of polytrifluoroethylene.

Images