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Fisher
Internal Valves
Fisher internal valves have gained wide acceptance for use as primary
shutoff valves, excess flow valves and back check valves. Internal
valves are installed in the inlets and outlets (liquid or vapor)
of pressure vessels and in piping systems to control the flow of
LP-Gas and NH3 (anhydrous ammonia). The most frequent application
is in bobtail and transport truck tanks, but they may also be used
on large stationary storage tanks and on in-line installations.
The valves can be used in conjunction with or without pumps and
compressors. Three closing systems 1. Manual, 2. Cable or 3. Air.
Available threaded or flanged.
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 Fisher
Globe and Angle Valves
Globe and angle valves are widely used at bulk plants to control gas
flow in the piping system, at storage tanks, on trucks, and at pumps
or compressors. Their body configuration permits installation in a
straight section of pipe (globe body) or where it is desired to make
change in piping direction (angle body). All units have a 1/4" FNPT
plugged boss in the downstream side of the body. A hydrostatic relief
valve ( type H124) for a vent valve ( type J402S) can be installed
in this outlet. Heavy duty ductile iron valves for either LP-Gas or
NH3 service. Ranging in size from 1/2' to 3', each valve has spring
loaded TFE chevron packing for an effective seal against leakage.
The valves are rated for 400 WOG and a maximum temperature of 150
deg F. Oversize ports in all units give high flow capacity.
Fisher Back Check Valves
Back check valves allow flow in only one direction and are normally
closed. They are installed in liquid filling connections on stationary
storage tanks, bobtail delivery trucks and liquid transfer lines.
Fisher Emergency Shutoff Valves
Snappy Joe Type N550 emergency shutoff valves (ESVs) are designed
for in line installations, usually near a bulkhead. The valves provide
a means of shutting off gas in the event of a hose rupture or piping
break at the transfer area to avoid a large scale of loss of LP-Gas
or NH3. The valves can be manually opened and closed at the installed
location or closed remotely by either cable or air. A remote operating
actuator is also available.
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 Fisher
Excess Flow Valves
Excess flow valves are intended to close upon excessive discharge
of liquid resulting form a brake in the hose or piping system. They
are used to protect cylinder, tank and piping systems, and are available
in a large variety of sizes and body configurations. When flow exceeds
the valve's setting, the valve closes and remains closed until the
system equalizes.
Fisher Relief Valves
Primarily for trucks transporting LP-Gas, NH3 or other compressed
gases. Types H721 and H731 stainless steel relief valves resist rust
and corrosion. Stainless steel makes it easy to remove the valve form
the tank for periodic testing (as prescribed by DOT), and permits
standard tank couplings instead of the more costly flanged tank openings.
Types H280 and H5110 internal spring relief valves can be used in
ASME tanks and have only the poppet and part of the body outside the
tank. The adjusting screw and all other parts are inside the tank,
safe from tampering.
Used on ASME and DOT containers external relief valves have all working
parts on the outside of the container connection so they must be protected
against mechanical damage.
Type 98H is a self-operated relief valve for use on relief and back
pressure applications involving large LP-Gas pumping systems and vaporizers.
Both the Type 1805 and 289H are diaphragm relief valves that protect
piping downstream of regulator from excessive pressure.
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