Phasecut - Phase Chopped Voltage Valve Controller:

Discontinued Product Line

Product Specifications:

Download Installation Guide



The Phasecut Valve Controller is primarily designed to control Staefa valves. It modulates a valve using a 0 to 20V phase chopped output signal referenced to a 4~20mA Input control signal. A 4mA input signal represents a 0V of phase chopping and a 20mA control signal 20V of phase chopping.

Zero and Span adjustments are provided for fine tuning of the Phasecut to individual valves if required.

A dither adjustment is provided to prevent sticking of valves. For all adjustments turn anticlockwise to decrease and clockwise to increase that function.


Power Supply 24V ac, 50VA Transformer.
Input Signal 4~20mA.
Isolation Test Voltage Input to Output; 1000V dc for 1min.
Output Signal 0~20V Phase Chopped.
Maximum Output Power 50VA.
Operating Temperature 0~70C.
Storage Temperature -20~80C.
Operating Ambient Humidity 5~85%RH Max. Non-condensing.
Din Rail Mount Fits all available EN Rails.
Dimensions L=78mm, W=68mm, H=65mm.