GA Figure 3670-DR :

Backpressure Sustaining Single Acting Altitude Valve

Size: 2" to 36"
Valve Type: Water Control Valve
Fluid: Water

GA Industries Figure 3670-DR Altitude Valves are self-contained, hydraulically operated, differential piston actuated valves.The valves are installed on the tank fill line and reliably close when the tank is full to prevent overflow and automatically re-open to replenish the tank when the water level falls 6” to 12” below maximum.The backpressure pilot throttles the valve as needed to sustain a minimum inlet pressure.

The valve’s unique V-port trim provides semi-linear flow control while opening and closing for ideal surge control plus full port capacity to minimize head loss.

GA Industries Figure 3670-DR altitude valves are often installed on low level ground storage tanks to sustain the upstream system pressure while the tank is being filled.

The valve can be supplied with an optional solenoid to override the hydraulic controls and close the valve anytime upon electrical signal and/or a differential level pilot to delay re-opening in order to allow tank drawdown.

  • Heavy duty cast iron body with lead-free bronze internals for long term dependable service
  • V-port trim for excellent flow control plus full port capacity
  • Visual position indicator
  • Closing speed needle valve
  • Wye strainer and pilot isolating valves
  • Super sensitive pilot for accurate and repetitive water level control
  • Body: Cast Iron, ASTM A126 Class B
  • Cover: Steel, ASTM A36
  • Internal Trim: Lead-free Bronze
  • Renewable Seat: Buna-N
  • Internal Fasteners: Stainless Steel
  • External Fasteners: Steel, A307, Zinc Plated
  • Pilot System: Stainless Steel, Lead Free Brass, Bronze or Copper
Corrosion Protection
  • Minimum 6 mil Internal and External 2-Part NSF-61 Carboline 891 Epoxy
Technical Datasheet
Figure 3670 Data Sheet 3670-01C
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Clean Water

Dependable valves that meet your clean water needs

From the raw water intake to the filtration plant to the finished waster distribution and storage system, GA Industries valves have been providing dependable service in large and small water systems. GA Industries pump control, check and relief valves mitigate damaging pressure surges and eliminate slam and bang that can result from the operation of water pumps.

Our full range of pilot operated control valves regulate distribution system pressure and prevent overflow of storage tanks and reservoirs. Air trapped in water pipelines can reduce system efficiency and exacerbate pressure surges. Our wide range of automatic air valves ensures we have the right valve to maintain an air free system.

And when it’s necessary to isolate a pump, process or section of pipeline, you can depend on GA Industries butterfly valves for reliable flow shutoff.

GA Figure 3670-DR :
Backpressure Sustaining Single Acting Altitude Valve
GA Figure 3670-DR  Image
Size: 2" to 36"
Valve Type: Water Control Valve
Fluid: Water

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