Stepping Actuator

The Master Flo Stepping Actuator is available to operate our P2 and larger bolted bonnet valves. It mounts directly to the valve cover plate to drive the valve stem nut. This feature allows for easy field conversion from manual to automated operation without disassembly of the valve. The actuator may be either pneumatic or hydraulic. A 4 to 20 mA transmitter is provided for remote monitoring of the choke position, and two limit switches are included for remote limit indication.

The actuator is designed for the remote operation of our production choke and control valve. It steps in 36° increments of stem-nut rotation in both the clockwise and counter-clockwise direction resulting in high precision of operation. Its maximum torque output exceeds the potential maximum torque required to operate our valves.

The actuator system has been tested under load to over one million cycles without maintenance or reduction in efficiency. Such endurance testing verifies that extended service life is achievable during operation of our choke valve.

The actuator provides "fail-in-last" position in the event of operating pressure supply failure. Manual operation is made possible by a 1-1/2" hex shaft that extends through the actuator housing and drives the valve stem nut directly.

Being of a continuous rotation design, the actuator is easy to mount and calibrate. It may be positioned in 45° rotational increments around the valve body centerline.

Electrical certification is available to UL, CSA, for Class 1, Div 1, Groups C and D; or to CENELEC to EEx d IIC T6 and EEx ia IIC T4.

Master Flo Valve, Inc., 4611-74th Ave., Edmonton, AB T6B 2H6. Tel: 780-468-4433; Fax: 780-469-9853.