Shafer has been manufacturing hydraulic power units (HPUs) for over 40 years. The primary industries we serve are natural gas, oil and water. The majority of installations have been for hazardous locations. Our expertise has evolved over the years by building products suited for hostile environments. Whether the application is an offshore platform, work barge, offshore loading terminal, cryogenic plant, or a slurry pumping station, Shafer can meet the challenge. Use the links to the right to download the brochures to get information on our various power units.
Hydraulically powered valve actuators are the primary application for Shafer HPUs. Shafer offers central hydraulic systems designed to operate any number of valves from a single control center. Hydraulic power is ideal for applications requiring valve modulation, regulation or on/off service. And, with accumulator backup, Shafer hydraulic power units provide the perfect solution for fail-safe and emergency shutdown applications.
HPUs are designed to provide sufficient pressure and volume to stroke valves singly or in unison, depending on customer needs. Satellite accumulators are available for fail-safe applications.
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All pressure vessels and accumulators are constructed, inspected and certified (“U” Stamped) to ASME Section VIII.
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Only SAE O-ring type fittings are used on the nitrogen side of accumulators in order to prevent nitrogen leakage.
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Accumulator pistons contain a small oil-filled cavity designed to lubricate the nitrogen side of the piston seals preventing seal failure associated with infrequent operation.
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The oil reservoir is pressurized to assist pump suction. The HPU reservoir is closed to the atmosphere preventing ingress of moisture and contaminants which is critical when using biodegradable fluids.
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Thermal Volume Motor Control
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HPUs from 5 gallon capacity to 2000 gallon capacity
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Operating pressures up to 3000 psi with standard components
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Biodegradable hydraulic fluids or petroleum based fluids
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Electrical classifications NEMA 4, 4X, 7, 9 or comparable CENELEC standards
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Offshore trim with Ameron high performance coating systems where required
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PLC or relay based control logic
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Energy sources:
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Electric motors
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Pneumatic driven hydraulic pumps
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Solar power to electric motors
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Gasoline or diesel fuel engines
Any combination of energy sources