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High Capacity Unloader Valves

High Capacity Unloader ValvesThe L&S Electric High Capacity Unloader Valves include relief valve and check valve functionality for hydroelectric turbine governors.

Advantages:

  • Standard SAE-type weld flanges, ready to weld into existing piping arrangements
  • Pilot valve filter rated for B10 = 200

Features:

All in one ulnloader, relief, and check valve design field piping and installation costs.

  • Unloader Valve
    • Allows governor pumps to start and stop with low backpressures, reducing motor stress
    • Smooth, soft shift operation
    • Fail-safe, solenoid operated, energize to load
  • Relief Valve
    • Overpressure adjustable from 200 to 1100 psi
    • No relief valve leakage until valve operates at set point
    • Clean blowing “chatter-free” operation
    • Settable within 7% above normal pump stop pressure, helping to prevent interference with pressure vessel air supply
  • Check Valve
    • Spring-seated “O” ring seal for quiet operation
    • Maintenance free design requiring only periodic filter changes

Specifications:

Flow ratings

  • 280 gpm @ 200 psi (1060 lpm @ 13.8 bar)
  • 400 gpm @ 400 psi (1515 lpm @ 27.6 bar)
  • 400 gpm @ 600 psi (1515 lpm @ 41.4 bar)
  • 400 gpm @ 800 psi (1515 lpm @ 55.2 bar)
  • 400 gpm @ 1000 psi (1515 lpm @ 69.0 bar)

Pressure range

  • 200 to 1100 psi (14 to 76 bar)
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