Instruction Manual

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.
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 ow rates and
possible leakage across the valve seats.
CAUTION
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 ow function or
“integral excess ow valve”, that will close when the ow
exceeds the ow rating established by Fisher. Fisher integral
excess ow 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 rst valve,
pump or tting downstream of the internal valve, provided
that the cargo tank pressure produces a ow rate greater
than the valve’s excess ow rating.
Likewise, if the internal valve is installed on a stationary
tank or in the related downstream piping system, the
integral excess ow 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 rst valve, pump or tting downstream
of the internal valve, provided that the ow of product through
the internal valve reaches the rated ow specied by Fisher.
EXPLOSION HAZARD
!
Restrictions incorporated in the discharge
system of a bobtail truck or transport or of
a stationary tank (due to pumps, pipe and
hose length and dimensions, branching,
elbows, reductions in pipe diameter or a
number of other in-line valves or ttings),
low operating pressure as a result of
ambient temperature or a partially closed
valve downstream from the integral excess
ow valve, can restrict the rate of ow
through the internal valve below the level
necessary to actuate the integral excess
ow valve. Therefore, DO NOT USE the
excess ow function of the internal valve for
the purpose of providing protection against
the discharge of hazardous materials in the
event of a rupture of hose or piping at a
point in the discharge system downstream
from the rst valve, pump or tting
downstream of the internal valve.
The internal valve is designed with an
internal bleed feature for equalization of
pressure. After the integral excess ow valve
closes, the leakage through the bleed must
be controlled or a hazard can be created. For
this reason the operator must be familiar with
the closure controls for the internal valve and
must close the internal valve immediately
after the integral excess ow valve closes.
Failure to follow this warning could result in
serious personal injury or property damage
from a re or explosion.
DOT Passive Shutdown Equipment Requirement—DOT
regulations 49CFR§173.315(n)(2) require certain cargo
tanks transporting propane, anhydrous ammonia and
other liqueed compressed gases to be equipped with
passive emergency discharge control equipment that will
automatically shutoff the ow of product without human
intervention within 20 seconds of an unintentional release
caused by complete separation of a delivery hose. The design
for each passive shutdown system must be certied by a Design
Certifying Engineer (DCE) and all components of the discharge
system that are integral to the design must be included in the
DCE certication. The DCE certication must consider any
specications of the original component manufacturer.
In the case of downstream ruptures in hose or piping, a
variety of operating conditions routinely encountered during
an unloading operation restrict the rate of ow through the
integral excess ow valve and make such a valve unsuitable
to serve as the means of passive shutdown required under
49CFR§173.315(n) (2). Such variables include restrictions
Types C471, C477 and C486
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