What are the types of pneumatic valve? How to work?

Pneumatic valve is a kind of commonly used valve control instrument, is made with the valve rod rotation round plate, to be opened in order to realize the enable action of pneumatic valve used mainly for truncation valve. Many types of pneumatic valve products, small make up to specific to introduce the classification of the pneumatic valve, hope you can help to you. Pneumatic flange valve, pneumatic rubber seal valve flange valve by the product and the carbon steel or stainless steel valve, the valve stem. Suitable for temperature ~ ℃ or less such as food, chemical, petroleum, electric power, textile, paper and other water supply and drainage, for adjusting flux on the gas pipeline and the role of intercepting medium. Pneumatic control valve is a kind of ( Valve plate) Perpendicular to the channel of the fixed axis rotation around the valve, its role by the piston double or single action ( Spring return type) Pneumatic actuators and valves, rotary type high performance adjustment or cut-off valve, with electricity, gas valve positioner or solenoid valve, air filtration pressure reducer, limit switch ( Valve position to dispatch) , which can realize the process piping fluid proportion in regulation and two cut control, fluid flow, so as to achieve the parameters such as pressure, temperature, liquid level of automation control. Pneumatic clamp valve, novel structure, body structure to meet the pipeline space is narrow and the wafer structure formed by a short distance, external zero leakage, internal leakage accord with national standard. Pneumatic rubber lining valve, flange connection, the clamp, the seal is lined with a nitrile butadiene rubber, ethylene-propylene rubber, heat-resistant ethylene propylene rubber, natural rubber, chloroprene rubber, fluorine rubber, ptfe, according to the chemical properties of medium have a more reasonable choice. Valve adopts pneumatic fluorine-butterfly valves, anti-corrosion lining fluorine points two pieces of the valve body, valve seat and valve body lined with integration, valve is working, only all plastic seat and lining plastic plate and the media contact, the product can withstand 'except molten alkali metals and fluorine element' of any medium corrosion, including DF stem with plate ( Forging) As a whole, evenly coated on the surface of a layer of FEP. Body channel inner surface is smooth, fluid resistance small, CV value is high, the flow capacity is strong, torque is moderate, use level 4 seal structure and outside the sealing surface with heat-resistant anti-aging SI rubber elastic gasket seating, completely to achieve zero leakage of the medium. Pneumatic ventilation valve, characteristics of valve plate between the seat with a thin seam, the product is suitable for the environment in poor air circulation. Pneumatic expansion valve, its main characteristics are as follows: novel design, reasonable, unique structure, light weight, convenient operation, opening and closing quickly; Expansion valve for adjusting and intercepting effect, in addition to compensating pipe temperature difference of heat bilges cold shrink function, can provide convenient for installation of replacement and maintenance of the valve. Sealing parts can be adjusted to replace, reliable sealing performance, etc. The working principle of pneumatic valve plate by the stem, if turned °, can complete an opening and closing. Change the deflection Angle plate, can control the flow of medium. The commonly used valve has two kinds of the wafer and flanged valves. Clamp valve with stud connection in place between two pipe flanges, the valve flange valve is a valve with flange, bolts on the valve flange connection on the pipe flange on both ends. Pneumatic valve is closed ( Disc or plate) As the disc, around the axis of rotation to achieve a valve open and close, mainly in the line cut off and throttling effect. Valve opening and closing is a disc plate, in the valve body around its own axis of rotation, so as to achieve the aim of opening and closing or adjust.