CN108488423A - A kind of multi-sealed supercharging ball valve - Google Patents

Abstract

The invention discloses a multi-seal pressurized ball valve, which comprises a main valve body. The main valve body includes left and right ports and flow passages connecting the left and right ports. The main valve body is provided with a valve body and a pressure port. Set to two, the valve body includes a valve seat set in the flow channel, the valve core is provided in the valve seat, and the valve core is connected to the pneumatic actuator through the connecting component; the pressure ports are set in two groups, and the two groups of pressure ports are respectively set Between the left port and the valve body close to the left port and between the right port and the valve body close to the right port, the pressurized port communicates with the flow channel, and the pressurized port is connected to the supercharger through the air pipe. The present invention adopts a double ball valve structure, and at the same time adopts an external pressurized design, so that a quadruple sealing structure is formed inside the present invention, which can effectively prevent the valve from leaking, and the double ball valve structure is equipped with a ball sleeve, which can avoid the leakage during long-term use. Among them, the problem of laborious opening and closing caused by the accumulation of fluid particle impurities between the valve core and the valve seat.

Description

A multi-seal booster ball valve

technical field

The invention relates to a ball valve, in particular to a multi-seal pressurized ball valve.

Background technique

Ball valves can be divided into pneumatic ball valves, electric ball valves and manual ball valves according to the driving mode. They are mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to be operated by rotating 90 degrees and a small rotation. It can be closed tightly by torque, and is suitable for use as a switch and cut-off valve. In my country, ball valves are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries, and occupy a pivotal position in the national economy. The opening and closing of the ball valve is driven by the valve stem, and the valve core is rotated around the axis of the ball valve through the valve stem to realize the opening and closing of the valve. The other two channels are connected. The following problems generally exist in the existing ball valves:

(1) The sealing is poor. During the long-term use of the ball valve, when the valve core moves relative to the valve seat when it is opened or closed, it will seriously wear or scratch the valve core or valve seat, thus causing the valve to lose its sealing performance;

(2) It is laborious to open and close. Because there is a certain pressure inside the valve during use, the opening and closing torque of the valve will be relatively large, and the opening and closing is not convenient enough, time-consuming and laborious. In addition, due to the continuous rotation of the valve core during use, fluid particles accumulate between the valve core and the valve seat, resulting in difficulty in opening and closing.

In view of this, there is an urgent need to improve the existing ball valve, increase its sealing performance, and reduce the difficulty of its opening and closing operation.

Contents of the invention

The technical problem to be solved by the invention is that the existing ball valve has poor sealing performance and inconvenient opening and closing.

In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a multi-seal pressurized ball valve, including a main valve body, the main valve body includes left and right ports and flow passages communicating with the left and right ports, The main valve body is provided with:

There are two valve bodies, the valve body includes a valve seat arranged in the flow channel, a valve core is arranged in the valve seat, and the valve core is connected to a pneumatic actuator through a connecting assembly;

The pressure ports are arranged in two groups, and the two groups of pressure ports are respectively arranged between the left port and the valve body close to the left port, and between the right port and the valve body close to the right port. Between the valve bodies, the pressurization port communicates with the flow channel, and the pressurization port is connected with a supercharger through an air pipe.

In the above solution, the two valve seats form a cavity in the flow channel between the two valve seats.

In the solution above, the connecting assembly includes a valve stem and a pneumatic coupling, the valve stem connects the valve core and the pneumatic coupling, and the pneumatic coupling connects the pneumatic actuator.

In the above solution, the pneumatic actuator includes a cylinder, a disc is connected to a piston rod of the cylinder, and the disc is connected with the pneumatic coupling.

In the above solution, the valve body also includes a valve cover and a packing gland, the packing gland is arranged inside the valve cover, the valve cover is arranged on the outer wall of the main valve body, and the valve stem It is installed in the valve cover and the packing gland, and a sealing packing is pressed between the valve cover and the packing gland.

In the above solution, the valve core is a spherical valve core, and the bottom of the valve seat is provided with a sealing ball sleeve adapted to the valve core.

In the above solution, a bracket is provided on the valve cover, and the pneumatic actuator is fixedly arranged on the bracket.

In the above solution, the left and right ports are respectively provided with connecting flanges.

In the above solution, a pressure relief valve is provided on the supercharger.

Compared with the prior art, the present invention adopts a double ball valve structure, and at the same time adopts the design of pressurization outside the valve, so that the present invention forms a quadruple sealing structure inside, which can effectively prevent the valve from leaking, and the double ball valve structure is equipped with a ball sleeve , It can avoid the problem of laborious opening and closing caused by the accumulation of fluid particle impurities between the valve core and the valve seat during long-term use.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a partial sectional view of the present invention;

Fig. 3 is A-A sectional schematic diagram among Fig. 2;

Fig. 4 is a front view of the right port in the present invention.

Detailed ways

The invention provides a multi-seal pressurized ball valve. The column valve body of the ball valve is provided with a multi-seal structure, which can effectively solve the problems of poor air tightness and inconvenient opening and closing of the existing ball valve. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 4, the present invention provides a multi-seal booster ball valve including a main valve body 6, which includes left and right ports and flow passages communicating with the left and right ports. The main valve body 6 is provided with a sealing and pressurizing device, which includes two valve bodies, two groups of pressurizing ports, a supercharger 17, and two pneumatic actuators, wherein the valve body includes a valve seat and a valve The valve core is arranged in the flow passage, the valve core is arranged in the valve seat, and the valve core is a spherical valve core. The two spools are respectively connected with the two pneumatic actuators through two connecting components. The supercharger 17 is connected with the pressure port through the gas pipe 16 .

In the present invention, the two valve bodies are arranged at intervals on the main valve body 6 to play the role of double sealing. Specifically, the two valve bodies are the left valve body 3 and the right valve body 9 respectively, and the two valve cores are the left valve core 10a arranged in the left valve body 3 and the valve core 10a arranged in the right valve body 9 respectively. There is a right spool 10b. The two groups of pressurization ports are the left pressurization port 15a and the right pressurization port 15b respectively. In the present invention, the multiple sealing and pressurizing functions of the main valve body 6 are realized through two valve bodies and two sets of pressurization, which has a better sealing effect.

In the present invention, the two valve seats are respectively a left valve seat 4a and a right valve seat 4b, the left valve body 3 includes the valve seat 4a, and the right valve body 9 includes the right valve seat 4b. The left valve seat 4a and the right valve seat 4b form a cavity in the flow channel between the left valve seat 4a and the right valve seat 4b. The left valve core 10a and the right valve core 10b are disposed in the left valve seat 4a and the right valve seat 4b, respectively. The two pneumatic actuators are respectively the left pneumatic actuator 1a and the right pneumatic actuator 1b. Specifically, the left pneumatic actuator 1a and the right pneumatic actuator 1b are respectively connected with the left valve core 10a and the right valve core 10b. The left pressure port 15a is set on the main valve body 6 between the left port and the valve body close to the left port, and the right pressure port 15b is set on the main valve body 6 between the right port and the valve body close to the right port superior. Both the left pressurization port 15a and the right pressurization port 15b communicate with the flow channel, and the left pressurization port 15a and the right pressurization port 15b are respectively connected to the supercharger 17 through the left air pipe 16a and the right air pipe 16b. The present invention realizes the principle of convenient operation and airtightness function as follows:

(1) The left pneumatic actuator 1a and the right pneumatic actuator 1b respectively drive the left valve core 10a and the right valve core 10b to rotate to realize the opening and closing of the main valve body 6, and the left valve body 3 and the right valve body 9 jointly control the main valve The opening and closing of body 6 has double control effect. In addition, the left pneumatic actuator 1a and the right pneumatic actuator 1b can respectively apply pressure to the left valve core 10a and the right valve core 10b so that they are in close contact with the left valve body 3 and the right valve body 9 respectively, further improving the airtightness sex. Specifically, when the main valve body 6 is closed, the left valve core 10a is in close contact with the left valve seat 4a, forming a first-stage good sealing structure. After long-term use, when the left valve core 10a and the left valve seat 4a cannot be tightly fitted, leakage will occur. At this time, the supercharger 17 works, and applies pressure to the left valve core 10a through the left side pressurizing port 15, so that the left valve core 10a and the left valve seat 4a are tightly fitted together again to prevent leakage. When it is still unable to seal at this time, the purpose of sealing is achieved through the tight fit between the right valve core 10b and the right valve seat 4b. When the right valve core 10b and the right valve seat 4b cannot be self-sealed, the supercharger 17 starts to work, and applies pressure to the right valve core 10b through the right side pressurizing port 15b, so that the right valve core 10b and the right valve seat 4b are reconnected. seal. This achieves the effect of quadruple sealing to prevent leakage;

(2) Since there is a cavity formed between the left valve seat 4a and the right valve seat 4b in the flow channel, and the left pressure port 15a is arranged on the main valve body 6 between the left port and the valve body close to the left port, the right The side pressurizing port 15b is arranged on the main valve body 6 between the right port and the valve body close to the right port, that is, the left valve seat 4a, the right valve seat 4b and the cavity are all arranged on the left side pressurizing port 15a and the valve body close to the right port. In the flow path between the right pressure port 15b. The pressure in the flow channel can be adjusted by the supercharger 17, so that the pressure on both sides of the left valve body 3 and the right valve body 9 can be balanced, and then the existing ball valve can be solved due to the pressure difference between the left and right ports of the flow channel. It is difficult to open and close due to different pressures. Specifically, when it is necessary to control the opening and closing of the main valve body 6, the supercharger 17 can release or pressurize the inside of the flow channel, thereby facilitating opening and closing.

In the present invention, the connecting assembly includes a valve stem 14 and a pneumatic coupling 13, the valve stem 14 is connected to the valve core and the pneumatic coupling 13, and the pneumatic coupling 13 is connected to the pneumatic actuator. The pneumatic actuator includes a cylinder, a disc is connected to the piston rod of the cylinder, and the disc is connected with the pneumatic coupling 13 .

In the present invention, the pressurization and pressure release of the valve body are realized through the supercharger 17. When the valve body is closed, under the action of the supercharger 17, the external air source enters the valve body through the pressurization port to realize pressurization. The supercharger 17 is provided with a pressure relief valve. When the valve body needs to be opened, the internal pressure of the valve body is released through the pressure relief valve, thereby reducing the internal pressure of the valve and realizing the functions of convenient opening, time saving and labor saving.

In order to ensure airtightness, the valve body also includes a bonnet 11 and a packing gland 12, the packing gland 12 is set inside the bonnet 11, the bonnet 11 is set on the outer wall of the main valve body 6, and the valve stem 14 is installed on the valve body. In the cover 11 and the packing gland 12 , a sealing packing is arranged between the valve cover 11 and the packing gland 12 . The bottom of the valve seat is provided with a ball sleeve 5 adapted to the valve core, which has better airtightness. A bracket 7 is arranged on the valve cover 11, and the pneumatic actuator is fixedly arranged on the bracket 7.

In order to facilitate the installation of the main valve body 6, the left and right ports of the main valve body 6 are respectively provided with connecting flanges for connecting with pipelines to be connected. The structure is simple and the installation is quick.

Compared with prior art, the beneficial effect of the present invention is:

The present invention adopts a double ball valve structure, and at the same time adopts a pressure-increasing design outside the valve, so that a quadruple sealing structure is formed inside the present invention, which can effectively prevent the valve from leaking. At the same time, due to the double ball valve structure, when one of the valve bodies fails to work normally, the other valve body can play a role, which solves the problem of difficult maintenance and reduces the length of the two ball valves in series, saving space. By adopting the external pressure boost design of the valve, the internal pressure of the valve is controllable when the valve is opened and closed, and the valve is opened and closed labor-saving;

The double ball valve structure of the present invention is provided with a ball sleeve 5, which can avoid the problem of laborious opening and closing caused by the accumulation of fluid particles and impurities between the valve core and the valve seat during long-term use.

The present invention is not limited to the above-mentioned best implementation mode, and anyone should know that the structural changes made under the inspiration of the present invention, all technical solutions that are identical or similar to the present invention, all fall within the scope of protection of the present invention Inside.

Claims (9)

1. A multi-seal pressurized ball valve, comprising a main valve body, said main valve body comprising left and right ports and flow passages communicating with said left and right ports, characterized in that said main valve body is provided with: There are two valve bodies, the valve body includes a valve seat arranged in the flow channel, a valve core is arranged in the valve seat, and the valve core is connected to a pneumatic actuator through a connecting assembly; The pressure ports are arranged in two groups, and the two groups of pressure ports are respectively arranged between the left port and the valve body close to the left port, and between the right port and the valve body close to the right port. Between the valve bodies, the pressurization port communicates with the flow channel, and the pressurization port is connected with a supercharger through an air pipe. 2 . The multi-seal pressurized ball valve according to claim 1 , wherein the two valve seats form a cavity between the two valve seats in the flow channel. 3 . 3. A multi-seal pressurized ball valve according to claim 1, wherein the connecting assembly includes a valve stem and a pneumatic coupling, and the valve stem connects the valve core and the pneumatic coupling , the pneumatic coupling is connected to the pneumatic actuator. 4. A multi-seal pressurized ball valve according to claim 1, wherein the pneumatic actuator includes a cylinder, and a disc is connected to the piston rod of the cylinder, and the disc is connected to the pneumatic coupling. Shaft connected. 5. A multi-seal pressurized ball valve according to claim 3, wherein the valve body also includes a valve cover and a packing gland, the packing gland is arranged in the valve cover, and the valve body The cover is arranged on the outer wall of the main valve body, the valve stem is passed through the valve cover and the packing gland, and a sealing packing is arranged between the valve cover and the packing gland. 6. The multi-seal pressurized ball valve according to claim 1, wherein the valve core is a spherical valve core, and the bottom of the valve seat is provided with a sealing ball sleeve adapted to the valve core. 7. The multi-seal pressurized ball valve according to claim 5, wherein a support is provided on the valve cover, and the pneumatic actuator is fixedly arranged on the support. 8. A multi-seal pressurized ball valve according to claim 1, characterized in that, the left and right ports are respectively provided with connecting flanges. 9. A multi-seal booster ball valve according to claim 1, characterized in that a pressure relief valve is provided on the booster.