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Types of pneumatic valves

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A pneumatic valve is an executive unit in a fluid control system in the industrial automation field. It is a combination of a pneumatic actuator and a valve, and when the actuator is driven by the air source pressure to control the operation of the valve. This chapter mainly describes It is a commonly used rotary switch type pneumatic valve.

Table of Contents


Composition of pneumatic valve

The pneumatic valve is mainly composed of pneumatic actuators and valves. Of course, according to different working conditions and user needs, different accessories can also be selected to achieve different functions, such as solenoid valves, air source triples, and return devices, Electrical positioners, etc.

Pneumatic actuator classification

From the rotation mode, it is divided into two types: linear travel and angular travel; from the structure: piston type, diaphragm type, plunger type, vane type, etc.; from the functional role, it is divided into: single-acting, double-acting, three-position and many more.

Main types of pneumatic valves:

1. Pneumatic V-type regulating ball valve

The pneumatic V-type regulating ball valve is an advanced control valve with a right-angle rotation structure. It can be used with a valve positioner to achieve proportional adjustment; it can be used with a two-position five-way solenoid valve and a control box to achieve switch control. The valve core of the pneumatic V-shaped ball valve is designed with a special-shaped V-shaped gap, which has accurate shut-off properties and control functions. It is suitable for various control occasions. It has the advantages of compact structure, small volume, and tight installation. Pneumatic V-type regulating ball valve is suitable for the control of gas, liquid, and solid granular media. Since there is no gap between the valve core and the valve seat, it has a great shearing force and self-cleaning performance. It is especially suitable for the control of suspensions and solid particles containing fibrous or tiny solid particles. Therefore, the pneumatic V-shaped ball valve can be widely used in the automatic control system of petroleum, chemical, paper, chemical fiber, electric power, metallurgy, pharmaceutical, environmental protection, and other industrial sectors.

2. Pneumatic O type cut-off ball valve

Pneumatic O-type cut-off ball valve It is composed of ARSOTA pneumatic piston actuator and O-type ball valve, including a soft-sealed ball valve and hard-sealed ball valve. The valve core adopts a cylindrical through-hole ball. The pneumatic O-type cut-off ball valve uses compressed air as a power source, accepts switching signals such as a distributed control system (DCS), a programmable controller (PLC), etc., and can achieve rapid position control of the valve through a solenoid valve. The pneumatic O-shaped cut-off ball valve adopts a straight-through casting valve body. The spherical surface is processed and hardened by a special process to make the surface smooth and wear-resistant. It has a long life, compact structure, reliable action, large flow capacity, small flow resistance coefficient, and easy installation. And good cutting performance and other characteristics.

Pneumatic O-type cut-off ball valve is widely used in papermaking, petrochemical, metallurgy, aerospace, food, medicine, water treatment, and other industries, especially suitable for process control of high viscosity and fiber-containing media. Pneumatic piston actuators can be divided into single-acting and double-acting. When double-acting is used when power is lost or air is lost, the valve is in the position when power is lost or air is lost to ensure continued production. When single-acting power loss or loss of air, the valve is in the original limit position (fully open or fully closed) to ensure that the production process is in a safe position.


3.ZJHM pneumatic film sleeve regulating valve

ZJHM pneumatic film sleeve regulating valve is widely used because of its good stability and simple maintenance. It can be designed as a balanced type to eliminate most of the static unbalanced force on the disc and has a certain damping effect, which can reduce fluid flow. Vibration can be used in situations where the pressure difference is relatively large, and a multi-spring pneumatic diaphragm mechanism or electric actuator can be selected.

4. Pneumatic flange type telescopic butterfly valve

Pneumatic flange type telescopic butterfly valve is suitable for food, medicine, chemical industry, petroleum, electric power, textile, papermaking, and other water supply and drainage, gas pipelines with temperature ≤80℃ and nominal pressure ≤1.6MPa as a flow adjustment and interception medium. The function of compensating for thermal expansion and contraction of pipelines. Its main features are: novel design, reasonable design, unique structure, lightweight, convenient operation, fast opening and closing, telescopic butterfly valve can not only adjust and intercept the flow, compensate for the thermal expansion and contraction caused by the temperature difference of the pipeline, but also for installation It is convenient to replace and maintain; the sealing part can be adjusted and replaced, and the sealing performance is reliable.

5. Pilot piston pressure reducing valve

The pilot piston pressure reducing valve is composed of two parts: the main valve and the pilot valve. The main valve is mainly composed of a valve seat, main valve disc, piston, spring, and other parts. The pilot valve is mainly composed of the valve seat, valve clack, diaphragm, spring, adjusting spring, and other parts. The outlet pressure is set by adjusting the spring pressure, the diaphragm is used to sense the outlet pressure change, and the pilot valve is opened and closed to drive the piston to adjust the flow area of the main valve throttling part to realize the function of pressure reduction and stabilization. YK43X/F/Y pilot piston gas pressure reducing valve is mainly used for gas pipelines, such as air, nitrogen, oxygen, hydrogen, liquefied gas, natural gas, and other gases.

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