Pneumatic regulating butterfly valve is a kind of valve (valve plate) rotating around a fixed axis perpendicular to the channel. It is composed of a piston type double acting or single acting (spring return type) pneumatic actuator and butterfly valve. According to the structure, it can be classified into medium linear structure, eccentric elastic seat sealing structure, and three-dimensional eccentric multi-level elastic sealing structure. It belongs to rotary high-performance regulating or shut-off valves. Equipped with electro pneumatic valve positioner or solenoid valve, air filter pressure reducer, limit switch (valve position indicator), it can realize proportional regulation and two position cut-off control of fluid medium in process pipeline, so as to achieve automatic control of flow, pressure, temperature, liquid level and other parameters of fluid medium. It is widely used in gas, turbid liquid, thick slurry, ash powder, suspended particles and other media.

The main characteristics of fiber compensator are as follows:
1. Compensated thermal shrinkage: it can compensate in multiple directions, which is much better than the metal compensator that can only compensate in single mode.
2. Compensate the device error. Because the system error is unavoidable in the process of pipe connection, the fiber compensator can better eliminate the device error.
3. Vibration attenuation and isolation: fiber fabrics and insulation cotton have the functions of sound absorption, vibration isolation and transmission, which can effectively reduce the noise and vibration of boiler, fan and other systems.
4. No reverse thrust: Since the main material is fiber fabric, it is unable to transmit. The use of fiber compensator can simplify the design, prevent the use of large bearings, and save a lot of data and labor.
5. Good resistance to high temperature and corrosion; The selected fluoroplastics and organosilicon materials have good high temperature resistance and corrosion resistance.
6. Good sealing performance; There is a relatively complete consumer assembly system, and the fiber compensator can ensure no leakage.
7. Light weight, simple structure, easy device maintenance.
8. The price is lower than that of metal compensator, and the quality is better than that of imported products. The price is 1/2~1/5 of that of imported products. Characteristics of non-metallic rubber compensator
In addition to the above advantages
1. Good vibration reduction effect
2. Good sealing, large flanging, no gasket sealing, direct installation, cost saving
3. Long service life