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Fisher™ CSB400 Pressure Reducing Regulators
Fisher CSB400 Series direct-operated, spring-loaded regulators provide pressure-reducing applications for commercial and light industrial installations.
This flexibility is provided by the numerous body sizes and end connections, outlet pressure settings, as well as the option for internal, external, or dual pressure registration. In addition to application flexibility, the CSB400 Series offers multiple overpressure protection options to meet your demands on application requirements.

CAD Drawings and Models: Click Here
Fisher™ CSB400 Pressure Reducing Regulators


Available Configurations
Stand-Alone Regulator, Non-Relief, Token Relief, Dual Pressure Registration, Internal or External Pressure Registration, Integral True-Monitor, VSX4 Slam-Shut Module
Body Sizes and End Connection Styles
DI: 1, 1-1/4, 1-1/2, 2NPT, Rp 1, 1x1-1/4, 1-1/4, 1-1/2, 2, Rp 1x2-1/4 GAZ, NPS 1-1/2/DN40, PN16, NPS2/DN50, CL125 FF, CL150 FF, PN10/16
ST: 1, 1-1/4, 1-1/2 NPT, Rp 1, 1-1/4, 1-1/2
Maximum Operating Inlet Pressure
16 bar / 232 psig
Maximum Emergency Inlet Pressure
20 bar / 290 psig
Outlet Pressure Range
17 mbar to 3.0 bar / 6.8-inches w.c. to 43.5 psig
Maximum Emergency Outlet Pressure (Casing)
4.0 bar / 58 psig
Maximum Outlet Pressure to Avoid Internal Parts Damage
0.35 bar / 5.0 psig above outlet pressure setting
Maximum Operating Outlet Pressure
3.0 bar / 43.5 psig
Pressure Registration
Internal or External
Temperature Capabilities
According to PED Standards: -20 to 60°C / -4 to 140°F
Non-PED: -30 to 66°C / -20 to 150°F
Approximate Weights
Threaded Body:
Type CSB400: 4 kg / 9 Pounds
Type CSB403: 9 kg / 20 Pounds
Type CSB404: 5 kg / 11 Pounds
Flanged Body: Add 4 kg / 9 Pounds to weights listed
Type TM600 True-Monitor™ Specifications
Control Press: 27-517mbar/11wc-7.5psi
Max Op Outlet Press Type TM600 on CSB403:517mbar/7.5psi
Vent:1/4 NPT
Ext Sense:1/4 NPT
Press Reg: Ext
Type VSX4 Slam-Shut Module Specifications
Vent:1/4 NPT
Ext Sense:1/4 NPT
Case Material: AL
Press Reg:Int or Ext


  • Integral True-Monitor
  • Slam-shut
  • Ductile Cast Iron and WCC Steel Bodies Available
  • Wide Variety of Body Sizes and End Connections
  • No Special Tools for Pressure Adjustment and Orifice Removal