The inlet pneumatic shut-off valve is also called the inlet pneumatic emergency shut-off butterfly valve. It consists of a single- or double-acting pneumatic actuator and a straight-through cast valve body. It is suitable for the working conditions of two-position switch (cut-off). Its structure is divided into metal seal and soft seal structure. The metal seal is made with a U-shaped stainless steel seal that is in precise elastomeric contact with a polished butterfly plate in three-dimensional eccentric contact. It solves the problem that the traditional three-eccentric butterfly valve is still in sliding contact friction when the sealing surface is opened and closed at 0° 10°, and realizes the effect that the butterfly plate is separated from the sealing surface at the moment of opening and the contact is sealed when the contact is closed, so as to achieve the purpose of prolonging the service life and the best sealing performance. The soft sealing structure is to use the body of the butterfly valve, and the wall of the valve body is lined with fluorine or rubber to achieve a completely sealed state with the butterfly plate to ensure zero leakage of the medium.
Part of the parameters of the imported pneumatic shut-off valve:
DN: DN50-1200
Nominal pressure: 06-32mpa
Connection: flange type, clamp type.
Disc form: vertical plate type.
Flow characteristics: Near-type quick-open type.
Range of action: 0-90°
Adjustable Range: 50:1
Control mode: switch two-position control, 4-20mA analog control.
Operating temperature: -20-550
Air supply pressure: 04-0.7 mpa
It can be equipped with accessories: positioner, air filter pressure reducer, guard valve, valve position transmitter, hand wheel mechanism, etc.
The imported pneumatic shut-off valve has the advantages of compact structure, small size, reliable operation, good sealing, easy maintenance, easy installation and strong adaptability.
The imported pneumatic shut-off valve is widely used in the pipelines of corrosive media such as metallurgy, electric power, petroleum, chemical industry, air, gas, combustible gas, water supply and drainage, etc., and is the best device for cutting off fluids.
Imported pneumatic shut-off valve product features:
1.Simple structure, compact, light weight, easy to install and disassemble, easy to maintain;
2.The use of stainless steel "U" type sealing ring, with a certain elasticity, regardless of high temperature and low temperature, it and the butterfly plate have excellent sealing.
3.After strict calculation of the three-dimensional eccentricity, the "U" type sealing ring has almost no friction with the butterfly plate, has a long service life, and has the function of getting tighter and tighter.
4.The sealing surface of the butterfly plate is made of surfacing cobalt-based cemented carbide, and the sealing surface is wear-resistant and has a long service life
5.The unique structure allows the "switch" to be completed by simply turning the stem 90°. The operation is flexible, convenient, labor-saving, not affected by the pressure of the medium, and the sealing performance is reliable: (6) It has the characteristics of high temperature resistance, low temperature resistance and strong corrosion resistance.