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VariStroke-I

VariStroke-I

    The VariStroke-I is a linear electro-hydraulic actuator that utilizes a double-acting or spring assist double acting power cylinder (part number dependent) with integrated electronic driver module, servo valve, and MLDT-based position feedback sensors to precisely control steam turbine valves. The actuator’s driver module accepts one or two (redundant) 4–20 mA demand set points and compares these set points to the sensed actuator shaft position to accurately control output shaft position.

    หมวดหมู่:

    The VariStroke-I is a linear electro-hydraulic actuator that is designed to provide the linear actuation force to operate steam turbine control valves or valve racks. This integrated actuator is intended for use on mechanicaldriven or generator-driven steam turbines and uses a low-pressure hydraulic oil source (typically
    turbine lube oil) to provide its output shaft force.

    1. Dirt-tolerant design
    1.1 Two moving parts
    1.2 50 lbf chip shear force
    1.3 Self-cleaning

    2. valve design
    2.1 Variable / configurable shaft stroke lengths

    3. Fast slew rates/times
    3.1 Application dependent
    3.2 Slew rate up to 762 mm/s (30 inches/second) @ 500 psig supply pressure and no load

    4. Precise position control

    5. Side-load tolerant
    5.1 Shaft bearings
    5.2 Triple seal technology

    6. Integrated driver
    6.1 Two 4–20 mA demand inputs
    6.2 Included valve flow linearization table

    7. Redundant MLDT position sensors
    8. Certified for Hazardous Locations