A rotary valve that has a quarter turn action in which the closure member is a cylindrical or tapered plug which operates by rotating on its axis and sealing against a downstream seat.

A regulator that is controlling/regulating the pressure in a system.

A slide valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

A valve that opens and closes a passageway by sliding over a port.

A regulator that is intended to keep a temperature within certain boundaries.