Fisher™ 133 Series Pressure Reducing Regulators

Fisher 133 Series direct-operated regulators are ideal for industrial and commercial applications supplying gas to furnaces, burners, and other appliances. A balancing system enables the regulator to control gas pressure accurately for maximum combustion efficiency despite varying inlet pressures.


Body Size and End Connection


Cast Iron: 2 NPT, NPS 2 / DN 50 CL125 FF flanged end connections
Steel Body: 2 NPT, NPS 2 / DN 50 CL150 RF flanged end connections
Operating Maximum Inlet Pressure Type 133L: 125 psig / 8,6 bar
Type 133H: 60 psig / 4,1 bar
Emergency Maximum Inlet Pressure Type 133L: 125 psig / 8,6 bar
Type 133H: 125 psig / 8,6 bar
Maximum Outlet (Casing) Pressure 15 psig / 1,0 bar
Outlet Pressure Range 2-inch w.c. to 10 psig / 5 mbar to 0,69 bar in 9 ranges
Temperature Capabilities -20°F to 150°F / -29° to 66°C
Approximate Weights Type 133H End Connection Style:?35?Pounds / 16 kg
Type 133L End Connection Style: 40 Pounds / 18 kg
Pressure Registration External


  • Wide pressure range capability with single regulator
  • Types 133L, and 133H suitable for monitoring applications
  • Excellent shock characteristics and fast speed of response
  • Bubble-tight shutoff
  • Spring and diaphragm effects minimized
  • No seat-to-seat adjustment required
  • Easy access to trim parts
  • Steel Body Available