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Ductile Iron Modulating Float Valve with Pressure Sustaining Feature

979GD-20 (Globe) and 979AD-20 (Angle) Series is designed to maintain a constant liquid level in a tank or reservoir, and also throttle to sustain a minimum upstream pressure during tank filling operations. Valve throttles open on a lowering liquid level and closed upon a rising liquid level.


  • Automatically maintains a constant liquid level in a tank or reservoir
  • Controlled by a remote mounted Modulating Float Pilot
  • Closing speed and Pressure Sustaining setpoint are adjustable
  • Throttles to maintain minimum upstream pressure during fill cycle

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Select options below to identify the UPC, Order Code, and Repair Kit for a specific 979GD-20

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: