1,Composition

Pneumatic sleeve control valve is usually composed of pneumatic actuator (such as air bag, piston, etc.) and valve body. Among them, the valve body is the main part of the valve, responsible for connecting the pipeline and meet the requirements of fluid dynamics; pneumatic actuator is the use of compressed air as a power source, through the control of the expansion and contraction of the air bag to promote the movement of the sleeve and spool. Specifically, the sleeve is a hollow cylinder sandwiched between the valve body and the spool, with the expansion and contraction of the air bag to change its inner diameter, thereby promoting the movement of the spool; the spool is the key component in controlling the flow of the medium, directly controlling the flow of fluids and piping parameters of the adjustment. In addition, the pneumatic sleeve adjustment valve may also contain compression springs and other components.

2,Working principle

The working principle of pneumatic sleeve adjustment valve is to control the opening and closing of the valve and the flow size through pneumatic transmission, in order to achieve the adjustment and control of pipeline parameters. Specifically, when the compressed air into the pneumatic actuator gas bag, the gas bag expansion and promote the sleeve and spool downward movement, so that the valve is open, the media to pass; when the compressed air stops supplying, the gas in the bag is discharged, the sleeve and spool in the spring or other reset mechanism under the action of the upward movement of the valve is closed. By controlling the supply and discharge of compressed air, the valve opening and flow size can be precisely adjusted.

3,Performance characteristics

Good stability: pneumatic sleeve adjustment valve valve plug is equipped with balance holes, which can reduce the unbalanced force of the medium acting on the valve plug, coupled with adequate valve plug guidance, so it is not easy to cause spool oscillation.
High regulation precision: pneumatic sleeve adjustment valve can realize precise gas flow control, suitable for a variety of occasions requiring high-precision flow control.
Interchangeability and versatility: the sleeve of pneumatic sleeve control valve can be replaced, so as to get different flow coefficients and flow characteristics to adapt to different working conditions.
Allowable differential pressure: Because the balancing principle of sleeve control valve is similar to that of double-seat valve, its allowable differential pressure is large, and it can withstand higher differential pressure.
Small influence of thermal expansion: the sleeve and valve plug are made of the same material, and the expansion caused by temperature change is basically the same, so the thermal expansion has less influence on the performance of the valve.
Convenient maintenance: the sleeve is sucked in the valve body through the upper bonnet, easy to disassemble and convenient maintenance.
At the same time, the pneumatic sleeve adjustment valve also has a certain degree of noise reduction, vibration damping effect, and further improved into a specialized low noise valve.

4,Application fields

Pneumatic sleeve adjustment valves are widely used in many fields, including but not limited to:
Chemical industry: it is widely used for flow control of various gas pipelines and equipments.
Metallurgical industry: used for flow control of high temperature and high pressure gas pipelines.
Power industry: used for fuel gas flow control of boilers and burners and other equipment.
Environmental protection industry: used for flow control of various waste gas treatment equipment.

5、Precautions for use

Before using the pneumatic sleeve adjustment valve, ensure that the cleanliness and dryness of the compressed air meet the requirements to avoid corrosion and damage to the internal parts of the valve.
Regularly check whether the parts of the pneumatic sleeve adjustment valve are intact, and replace them in time if they are damaged.
When installing and maintaining the pneumatic sleeve adjustment valve, it should be operated in strict accordance with the relevant specifications to ensure the performance and safety of the valve.


In summary, the pneumatic sleeve adjustment valve is a kind of industrial automation control equipment with superior performance and wide application. In the process of use, attention should be paid to its performance characteristics and use of precautions to ensure its normal operation and long-term stability.