Back To Top
Fisher™ N100-N100A-N110 Series Bypass Valves
N100, N100A, and N110 Series valves are designed for use with propane, butane, and anhydrous ammonia (NH3) at ambient temperatures.
A 1/4-inch threaded NPT tapped and plugged boss on the inlet side of the body can be used to install a hydrostatic relief valve or a pressure gauge. They have internal sensing orifices so that no external sensing line is required. These valves are designed for bypass applications on 2 through 4-inch size pumps.
Fisher™ N100-N100A-N110 Series Bypass Valves


Body Sizes and End Connection Styles (inlet x outlet)
N100 and N100A Series: 1, 1-1/4, 1-1/2, 2, and 2-1/2-inch FNPT
N110 Series: 3/4 and 1-inch FNPT
Set Pressure Ranges
N100 and N100A Series :
  1 through 1-1/2-inch: 25 to 150 psig / 1,7 to 10,3 bar
  2 and 2-1/2-inch: 25 to 150 psig / 1,7 to 10,3 bar
N110 Series:
   3/4 and 1-inch: 12 to 150 psig / 0,8 to 10,3 bar
Maximum Inlet Pressure
400 psig / 27.6 bar WOG
Temperature Capabilities
-20 to 160°F / -29 to 71°C


  • Closing Cap
  • Pressure Sensing Orifice
  • Piston Inner Valve
  • Exclusive Venturi Passage
  • UL Listed