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LF920GD

Ductile Iron Pressure Relief, Sustaining or Backpressure Control Valve

The LF920GD (Globe) and LF920AD (Angle) Series is designed to permit flow when upstream pressure is above the adjustable setpoint of the control pilot, and throttle when upstream pressure falls below the adjustable setpoint. When installed off the main line on the branch of a tee, the valve serves as a Pressure Relief Control Valve. It remains normally closed, and quickly opens when upstream pressure exceeds the pilot setting, relieving excess pressure. When installed in line connecting two distribution zones, the valve acts as a Pressure Sustaining Control Valve. When upstream pressure falls below the pilot setting the valve throttles to sustain pressure in the upstream zone. When installed in line on the discharge of a pump, the valve acts as Backpressure Control Valve. When pump discharge pressure falls below the pilot setting the valve throttles to increase backpressure against the pump.

Features

  • Closing speed and pressure setpoints are adjustable
  • Permits flow when upstream pressure is above the adjustable setpoint of the control pilot, and throttle when upstream pressure falls below the adjustable setpoint
  • Depending on installation location, the valve serves as a Pressure Relief Control Valve, Pressure Sustaining Control Valve, or Backpressure Control Valve
  • Sizes 1 1/4 in. to 16 in. (32mm to 400mm)

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF920GD

Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: