The CPC-II  is an electro hydraulic pressure-regulating valve control that utilizes a very
accurate internal pressure sensor and PID controller to precisely control steam turbine
valves. The epe consists of a valve-actuator assembly, pressure sensor, and electronic
driver module. The unit's driver module accepts one (or two) 4-20 mA pressure setpoints
and compares these setpoints to the sensed oil pressure, to accurately control turbine
valve oil pressure.

The CPC-II  controls oil pressure by porting supply-oil to its control-oil output port (turbine
valve control oil) or back to the system supply tank. This converter's special PID
architecture allows it to perform very stable pressure control during normal conditions,
and respond in milliseconds to desired valve step Changes during system or plant
transients. As a means of protecting the turbine, an internal valve-return-spring forces the
epe to a failsafe position (port oil to drain) and safely close turbine control valves upon
any internal unit failure (electrical input power failure, pressure sensor failure, processor
failure, etc.).