EHPS – Electrohydraulic Power Servo

The EHPS is a three-stage servo valve used in conjunction with a customer-supplied power cylinder to provide very accurate and responsive power cylinder control. The EHPS, in conjunction with a new or already installed steam valve cylinder, provides the linear actuation force to operate steam turbine control valves or valve racks. This servo can be configured to drive single or double acting actuators, and to use the system’s turbine lube oil supply, or a separate oil source (5.5-17.2 bar, 80-250PSI).

This servo is ideal for retrofits where it is desired to upgrade the turbine control and hydraulic system but keep the expensive steam valve power cylinder. In retrofit applications the EHPS can directly replace the existing steam valve power cylinder operating system. This saves costly repairs to existing servos and eliminates difficulties in obtaining spare parts for obsolete equipment. The EHPS is designed to control power cylinders with bore diameter sizes in the range of 100 - 255mm (4 - 10") and servo stroke lengths in the range of 50 - 305mm (2 - 12").

The EHPS product is available in following configurations:

• EHPS - single coil, single oil source input
• EHPS - dual coil, single oil source input
• EHPS - single coil, separate torque motor & final stage oil source inputs
• EHPS - dual coil, separate torque motor & final stage oil source inputs

EHPS models that have separate torque motor and final stage oil source inputs, allow users to reduce their unit filtration volume requirements by only filtering the oil supply to the EHPS torque motor.

Contact GCS for product specifications and technical manuals