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Fisher™ N120 Series Backpressure Valve
N120 Series backpressure valve is installed after the meter, and it holds backpressure on the meter until vapor is forced back to the tank through the vapor eliminator.
In this way vapor cannot form within the meter during liquid delivery. Intended for smaller pumps, N120 Series are ideal on such applications as cylinder filling installations. All units have a 1/4-inch FNPT tapped and plugged boss on the inlet side of body and can be used for both LP-Gas and Anhydrous Ammonia (NH3) service.
Fisher™ N120 Series Backpressure Valve


Body Sizes and End Connection Styles (inlet x outlet)
Type N120-06-3: 3/4-inch FNPT
Type N120-08-3: 1-inch FNPT
Differential Pressure Setting
12 psid / 0,83 bar
Differential Pressure Range
10 to 20 psid / 0,69 to 1,4 bar
Maximum Inlet Pressure
400 psig / 27.6 bar WOG
Temperature Capabilities
-20 to 140°F / -29 to 60°C


  • Designed for Use with Propane, Butane, and Anhydrous Ammonia at Ambient Temperatures
  • Ideal for Cylinder Filling Installation