Warranty Note - Emerson C471 Instruction Manual

Type C486 Flange Installation
Lightly coat both sides of a spiral-wound, or other
suitable, flange gasket with silicone grease or
equivalent. An NPS 3 / DN 80, CL300 ASME RF flange
with a modified bore (see Figure 3) must be installed in
the tank. Special stud bolts, furnished with the valve,
are assembled into this flange. The internal valve
and flange gasket can then be installed as shown in
Figure 4 with good flange bolting practices.
Selectively Filling Manifolded Tanks
Fisher™ internal valves provide positive shutoff only
in one direction, from out of the tank to downstream
of the valve. The internal valves are designed to
allow gas to flow into a tank when the downstream
line pressure exceeds tank pressure. If you want to
selectively fill one or more of the other tanks in a tank
manifold system, you must place a positive shutoff
valve downstream of the internal valve, otherwise, all
tanks will be filled at the same time and at about the
same rate.
Actuators
The remote operating control system for the valve is
extremely important and it must be installed to conform
with the applicable codes. DOT MC331, for example,
most generally applies for trucks.
Fisher offers both cable controls and pneumatic
actuator systems to operate the C470 and C486 Series
internal valves. It may also be possible to use cable
controls from other manufacturers or to fabricate a
linkage mechanism.
Any control system requires thermal protection (fuse
links) at the valve, at the remote control point and, if
necessary, near the hose connections. The Instruction
Manuals for Emerson actuator systems show how to
install the fuse links.
Installation instructions on Fisher Types P650,
P163A and P164A cable controls, are in Document
D450012T012. Pneumatic actuator installation is
covered in Document D450162T012. Type P340
latch/remote release instructions are on
Document D450123T012.
The operating linkage must allow the operating lever
to move from the fully closed position to within 2° of
the fully open position. The linkage should not apply
strong force to the lever past the fully open position or
the valve could be damaged.
Types C471, C477 and C486

Warranty Note

The use of non-Fisher actuators will void
internal valve warranty and may result in
leakage of the gland packing caused by
premature wear. In addition to premature
wear, the use of non-Fisher actuators
may result in lower than expected flow
rates and possible leakage across the
valve seats.
The internal valve's closing spring is
not designed to overcome drag in the
control linkage in order to close the
valve. Depending upon the control
system used, an external spring (such
as Fisher drawing number 1K4434) or
positive closing linkage may be needed.
Be sure the control system is installed
to prevent binding that could cause the
valve to stick in the open position.
Excess Flow Operation
The internal valve contains an excess flow function or
"integral excess flow valve", that will close when the
flow exceeds the flow rating established by Fisher.
Fisher integral excess flow valve installed on a bobtail
truck or transport can provide protection against the
discharge of hazardous materials during an unloading
operation of a bobtail truck or transport in the event
that a pump or piping attached directly to the internal
valve is sheared off before the first valve, pump or
fitting downstream of the internal valve, provided that
the cargo tank pressure produces a flow rate greater
than the valve's excess flow rating.
Likewise, if the internal valve is installed on a
stationary tank or in the related downstream piping
system, the integral excess flow valve can provide
protection against an unintentional release of
hazardous materials in the event that a pump or piping
attached directly to the internal valve is sheared off
before the first valve, pump or fitting downstream of
the internal valve, provided that the flow of product
through the internal valve reaches the rated flow
specified by Fisher.
CAUTION
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