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Fisher™ Types C471 and C477 Jet Bleed Internal Valves
The valves are typically used on the inlets and outlets of bobtail and transport trucks and on large stationary storage tanks.
They can also be installed in-line. Designed for propane, butane, or NH3 at ambient temperatures, the valves can be used on other compressed gases, but the user should check with the factory to make sure the valves are suitable for the particular service.

CAD Drawings and Models: Click Here
Fisher™ Types C471 and C477 Jet Bleed Internal Valves


Body Sizes and End Connection Styles
Inlet: 2 or 3-inch MNPT / DN 50 or 80
Outlet: 2 or 3-inch FNPT / DN 50 or 80
Maximum Allowable Inlet Pressure
400 psig / 27.6 bar WOG
Temperature Capabilities
-20 to 150°F / -29 to 66°C
Approximate Weights
2-inch Sizes / DN 50:
Type C471: 11 Pounds / 5 kg
Type C477: 9 Pounds / 4 kg
3-inch Sizes / DN 80:
Type C471: 21 Pounds / 10 kg
Type C477: 16 Pounds / 7 kg


  • Rapid equalization bleed area
  • Unique Serviceability Features
  • Excess Flow Closure
  • Back Check Feature
  • Spring loaded polytetrafluoroethylene (PTFE) stub shaft packing
  • PTFE wear pads Rulon® Bushings at critical wear points
  • Manual, Cable, or Air Open/Close valve actuators
  • Thermal Fusible links or plugs melt at 212 to 220°F / 100 to 104°C and allow valve closure in the event of a fire at the valve