The Electro•Hydraulic Power Unit is a totally sealed system with its own internal hydraulic reservoir. The hydraulic pump is driven by a fractional horsepower electric motor. The explosion proof/weather proof motor operates on 120 VAC, single phase power which simplifies electrical hookup.

A hydraulic accumulator holds supplemental power to supply the specified number of valve strokes. The accumulator head pressure is provided by the natural gas in the pipeline which eliminates the need for additional pressure vessels.

The patented Shafer thermal volume control protects the circuit components from damage due to thermal expansion within a closed system. The thermal volume control also functions to start/stop the electric motor which eliminates the need for pressure switches.

When the system is first energized, the motor/pump will begin to fill the working accumulator. Once the working accumulator is completely topped-out with fluid, the piston/rod in the thermal volume accumulator will begin to move upward as pressure continues to build. At the point the thermal volume accumulator fills to a designated level, the actuating disc on the piston/rod will trip the motor/pump switch which shuts off the motor.

While the motor is off, the piston/rod will shift a small amount to compensate for thermal changes in the fluid volume. Once the working accumulator is required to stroke the valve actuator, the piston and rod move downward to restart the motor/pump. The hydraulic pressure in the power unit will always stabilize at a pressure level equal to the pressure in the pipeline. The power units will automatically adjust to changes in the pipeline pressure. This system does not require pressure switches or adjustments.

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FEATURES:

Completely Closed System

The power unit utilizes the available natural gas pressure without exhausting

any gas into the atmosphere.

Fast Operation Without Shock

The hydraulic accumulator provides smooth operation even at rapid stroking

speeds. Separately adjustable speed control valves may be used to provide

a broad range of opening and closing times.

Fail-Safe Reserve Power

In the event of electrical power failure, the accumulator will maintain reserve

hydraulic power for a specified number of valve strokes.

Manual Hydraulic Hand Pump

For emergency operation, a hydraulic hand pump may be used to directly

stroke the actuator or to recharge the accumulator.

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