The characteristics of pneumatic actuators are: small volume, light weight, large torque, long life, high reliability, maintenance is simple, good adaptability to the environment, the output rate of function, has the explosion-proof function. Widely used in natural gas, petroleum, chemical fertilizer, metallurgical, mining, the electric power, the papermaking, the printing and dyeing, pharmacy, food diet, water supply and drainage, air handling and heating, etc.

1, right choice pneumatic actuators various parameters?
Because of different electric actuator manufacturer of electrical parameter has a difference, so when the design selection generally need to determine its electrical parameters, mainly motor power, rated current, secondary control circuit voltage, etc., often in this negligence, the result of the control system and the electric actuator parameters not matched by time and space open trip, fusing, thermal overload relay protection and fault take-off is like

2, pneumatic actuator output torque depends on the valve with a torque
The valve opening and closing the torsion determines the electric actuator choose how much output torque, general by user puts forward or valve manufacturer to matching, as actuator manufacturer only for the implementation of the output torque is responsible for opening and closing, the valve normal required torque by valve diameter size, work stress factors, but because the valve factory machining accuracy, the assembly process different, so different manufacturer production of the same specification valve required torque is also different, even the same valve manufacturer production of the same specification valve torsion also has a difference, when elected type actuator torque choice is too small will cause not normal valve opening and closing, so the electric actuator must choose a reasonable torque range.

Note: correct choose a actuator is very important
Such as actuator is too large, the valve stem may be excessive force. Instead such as actuator is too small, side cannot produce enough moment to full operation of the valve. Generally speaking, we think that operation of the valve the moment from the valve metal parts (such as ball core, disc) and seals (seat) between friction. According to the valve use situation, using temperature, operation frequency, pipeline and differential pressure, flow medium, there are many factors influence operating torque.