Data Sheet
Bulletin LP-7:C471/C477
D450244T012
September 2012
www.fisherregulators.com
Types C471 and C477
Jet Bleed Internal
™
Valves
Features
•
Patented rapid equalization bleed area
–
Provides
fast valve response for quick opening.
• Unique Serviceability Features – Stainless trim
parts and poppet designed with integral wrench at for
easy maintenance.
• Durable Design – Stainless poppet and stem interface
smoothly for a long wear life.
• Excess Flow Closure – Functions when ow exceeds
the valves rated capacity or piping is sheared off at
the valve.
Figure 1. Types C471 and C477 Jet Bleed Internal
™
Valves
Introduction
Types C477 and C471 Jet Bleed Internal
™
Valves
are designed to provide rapid equalization of tank
pressure and downstream line pressure, providing a fast
valve response time for quick valve opening. These
may be used as primary shutoff valves, excess flow
valves, and back check valves for Propane, Butane,
and NH
3
(anhydrous ammonia) transfers between
stationary bulk storage tanks and mobile transports
for fill or delivery applications of liquid or vapor gas,
and on in-line applications. The valves can be used in
installations with or without pumps and compressors.
Non Underwriters Laboratories (UL
®
) listed types are
available with a variety of trim types and body styles and
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. Actuation of the
valve can be achieved manually, by cable, or with a
pneumatic actuator.
• Back Check Feature – Allows reverse ow, ll with or
without actuator device in valve open position.
•
shaft packing.
• PTFE wear pads Rulon
®
Bushings at critical
wear points
• Manual, Cable, or Air Open/Close valve actuators.
Rulon
®
is a Trademark of Saint-Gobain Performance Plastics Corporation.
Type C477
Type C471