body

actuator

valve type
gas closed (B) - lost when the gas valve open (FO); open air (K) - lost when the gas valve closed (FC)

attachment
$ $positioner, air filter regulator, Paul position valve, limit switch, valve position transmitter, hand wheel institutions

to

rated flow coefficient KV, rated stroke, allowing the pressure

Note: the allowable voltage difference determined based on: 1) standard spring; valve closed P2=0; 2) to the bottom into higher.