Test questions of pneumatic explosion-proof butterfly valve for differential pressure transmitter Air close type: the action direction is exactly opposite to that of air open type. When the air pressure increases, the valve acts in the closing direction. When the air pressure decreases or does not exist, the valve acts in the opening direction until it is fully opened, so it is sometimes called fail to open FO. Air opening or air closing of pneumatic control valve is usually realized by different assembly methods of valve body internal structure and actuator.
Main use of stainless steel pneumatic butterfly valve;
1. Recommend corrosive chemical media or organic solvents (such as nitrogen, water, acetone, etc.); 2. Escort high-temperature gas, hot oil and other high-temperature media (such as hot steam, heat transfer oil, etc.); 3. Escort cryogenic or ultra-low temperature media (such as liquid nitrogen);
4. Escort water, gasoline and other media under high temperature environment (such as water vapor system and hydraulic system in steelmaking, coking and continuous casting equipment); 5. Pipeline requiring shock absorption or noise elimination (such as pump inlet and outlet). Stainless steel pneumatic butterfly valve device request
