a hydraulic valve is driven by a linear force motor. The valve controller receivers a positon-command from the fieldbus via the system controller and drives the linear force motor until the output signal fo the position sensor equals the input value of the position command.

any pneumatic devices require control valves that are cheap, reliable and rugged. Heretofore it has been proposed to employ a three-way ball valve of the type comprising a valve body having two axially spaced ports, a valve seat associated with each of those ports, a third port located between the o

water power control valve, its body has on its face opposed to the valve seat a sealing disc which comes into contact with the valve seat when the valve is closed.

Regulator is self-control system actuators, its application quality direct responsed in system control quality. As process control terminal components, people have newer understanding to its importance, compared with the past.

Intelligent regulator is the regulator contains microprocessor, can realize the intellectualized control function. The regulator intelligence usually adopts the following several forms

the introduction of control valve

In this configuration the building air supply feeds a factory installed temperature controller which operates the steam control valve.

air flow control valves have an adjustable metering needle and a check valve to control the flow in only one diretion.