Rotary Vane Subsea Actuators
The subsea rotary vane type actuator is ideal for double acting (open/close) valve control. The rotary vane can also be utilized in fail-safe applications where a hydraulic accumulator is used to provide power for the fail-safe valve stroke. Accumulators can be mounted with the subsea actuator or positioned topside with the hydraulic power unit.
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The rotary vane has several distinct advantages for subsea use including:
- The rotary vane is the most compact actuator available
- The actuator is mounted concentrically over the valve stem, making the system exceptionally stable.
- The double vane actuator produces pure balanced torque and, by design, will not generate any side loading on the valve stem or actuator bearings.
- Pressure compensation devices are not required, even at depths up to 1,000 meters.
ACTUATOR MOUNTING
Mounting systems include conventional permanent actuator to valve mounting, along with ROV or diver activated quick connect\disconnect styles of mounting adaptors.
The quick connect/disconnect mounting system allows for easy removal of the actuator, from the valve, while submerged.
A sealed cover is available to protect the valve stem from corrosion and sea growth after the actuator is removed.
For re-installation, tapered pins are used to simplify mounting the actuator, in the correct position, while in the subsea environment. All Shafer actuators provide complete purging and by-pass valving for initial commissioning or remounting subsea. CAPABILITIES
Our turn-key expertise enables us to design and provide the complete subsea “valve operating system”.
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Double acting actuators.
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Torque outputs to 5 million in-lbs (564,922 Nm).
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Hydraulic power units.
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Power storage accumulators for fail-safe valve operation.
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Umbilical termination assemblies which provide all hydraulic and electrical requirements for the subsea actuators.
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ROV compatible actuator controls and control panels.
- Valve position indication accessories.
PROTECTIVE COATING SYSTEM
Shafer utilizes a coating system produced by Ameron Protective Coatings Division. The experts at Ameron have verified and approved our application processes and coating thicknesses to give us the best coating system possible for this type of equipment.
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The initial coating applied to all carbon steel surfaces is an abrasion resistant inorganic-zinc coating which provides long lasting cathodic protection. The coating has excellent resistance to weathering, splash and spill of petroleum products or solvents.
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Intermediate and topcoats are polyamide-cured epoxy coatings which provide excellent durability in the marine environment; withstands solvents, petroleum products, seawater, salt solutions, and sour crude.
NOTE: Alternate coating systems may also be specified by the customer. |
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