Emerson C471, C477 Instruction Manual
Instruction Manual
MCK-2287
September 2014
Types C471, C477 and C486
Types C471, C477 and C486 Internal Valves
WARNING
!
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion and/or re
causing property damage and personal injury
or death.
Fisher® equipment must be installed, operated
and maintained in accordance with federal,
state and local codes and Emerson Process
Management Regulator Technologies, Inc.
(Emerson™) instructions. The installation
in most states must also comply with NFPA
No. 58 and ANSI Standard K61.1.
Only personnel trained in the proper
procedures, codes, standards and regulations
of the LP-Gas industry should install and
service this equipment.
The internal valve must be closed except
during product transfer. A line break
downstream of a pump may not actuate the
excess ow valve. If any break occurs in the
system or if the excess ow valve closes, the
system should be shut down immediately.
Introduction
P1197
TYPE C477
TYPE C486
TYPE C471
Scope of the Manual
This manual covers instructions for the Types C471, C477
and C486 internal valves.
Description
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.
www.fisherregulators.com
Figure 1. C471, C477 and C486 Series Internal Valves
Specications
The Specications section on the following page shows
specications for Types C471, C477 and C486 internal valves.
DOT Internal Self-Closing Stop Valve Requirement—
U.S. Department of Transportation (DOT) regulations
49CFR§178.337-8(a)(4) require each liquid or vapor
discharge outlet on cargo tanks (except for cargo tanks used
to transport chlorine, carbon dioxide, refrigerated liquid and
certain cargo tanks certied prior to January 1, 1995) to be
tted with an internal self-closing stop valve. Fisher “C” Series
internal valves comply with the internal self-closing stop valve
requirement under the DOT regulations.
D450229T012
Types C471, C477 and C486
Specications (continued)
Body Size and End Connection Styles
Types C471 and C477
Inlet: 2 or 3-inch MNPT / DN 50 or 80
Outlet: 2 or 3-inch FNPT / DN 50 or 80
Type C486
Inlet: 3-inch CL300 RF Flange / DN 80
Outlet: 3-inch FNPT / DN 80
Number of Outlets
Type C471: 2 (side and straight through)
Types C477 and C486: 1 (straight through)
Excess Flow Springs
Type C470 Half Coupling and Type C486 Flows:
2-inch Sizes / DN 50: 105, 150 and 250 GPM / 397, 567
and 946 L/min
3-inch Sizes / DN 80: 160, 265, 375 and 460 GPM / 605,
1003, 1419 and 1741 L/min
Type C470 Full Coupling Flows:
2-inch Sizes / DN 50: 60, 80 and 130 GPM /
227, 302 and 492 L/min
3-inch Sizes / DN 80: 120, 230, 320 and 380 GPM / 454,
870, 1211 and 1438 L/min
Maximum Allowable Inlet Pressure
400 psig / 27.6 bar WOG
Temperature Capabilities
-20 to 150°F / -29 to 66°C
(1)(2)
(1)
Approximate Weights
2-inch Sizes / DN 50:
Type C471: 11 pounds / 5.0 kg
Type C477: 9 pounds / 4.1 kg
3-inch Sizes / DN 80:
Type C471: 21 pounds / 10 kg
Type C477: 16 pounds / 7.3 kg
Type C486: 20 pounds / 9.1 kg
Construction Materials
Ductile Iron: Body (Types C471 and C477)
Stainless steel: Stem Assembly, Excess Flow Spring,
Spring Seat, Closing Spring, Disc Holder, Disc Retainer,
Screw, O-ring Seat, O-ring Retainer, Cotter Pin, Spring,
Shaft, Screen, Travel Stop, Screen Cap, Bolt, Gasket
and Lock Washer
Steel: Body (Type C486), Cap Screw and
Operating Lever
Plated steel: Nut, Washer, Bonnet Nut, Guide Bracket
and Cap Screw
Polyurethane (PU): Rod Wiper
Polytetrauoroethylene (PTFE): Bushing, Packing
Adaptor and Packing Ring
Nitrile (NBR) (Standard Construction): Main Disc,
Bleed Disc and O-ring
Other Disc Material Available from Factory: PTFE,
Fluorocarbon (FKM), Neoprene (CR), Ethylene-
Propylene (EPDM) and Kalrez®
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
2. Product has passed Fisher® testing for leakage down to -40ºF / -40ºC.
Principle of Operation
Refer to the schematic drawing, Figure 2. In view #1, the
valve is held closed by both tank pressure and the valve’s
closing spring. There is no leakage past the resilient seats
in the poppet to the valve outlet.
The valve is opened by moving the operating lever to
approximately mid-point in its 70° travel (view #2). This
allows the cam to place the rapid equalization portion of the
valve stem in the pilot opening, permitting a larger amount
of product to bleed downstream than if the operating lever
were moved to the full open position.
When tank and downstream pressure are nearly equal
after a few seconds, the excess ow spring pushes open
the main poppet (view #3) and the operating lever can be
moved to the full open position.
If tank pressure is greater than the valve’s outlet pressure,
the main poppet will remain in the closed position. If valve
outlet piping is closed off by other valves, however, product
bleeding through the pilot will increase until it nearly equals
tank pressure and the main poppet opens.
Kalrez® is a mark owned by E.I. du Pont de Nemours and Co.
The main poppet will not open if valve
outlet piping is not closed off so that
the outlet pressure can approach
tank pressure.
Once the main poppet opens, a flow greater than
the valve’s excess flow spring rating or a sufficient surge
in flow forces the main poppet closed against the excess
flow spring (view #4). The pilot valve allows a small
amount of product to bleed, but much less than view #2
where the rapid equalization portion of the stem is placed
in the pilot opening. When the operating lever is moved to
the closed position, the valve closes completely and seals
tightly (view #1).
Installation
Mounting and Piping
The internal valves can be installed in either a half or full
coupling. Excess ow spring closing ow rates vary in half and
full couplings, refer to the Specication section.
Note
2
Types C471, C477 and C486
M1170
JET
BLEED
1 2 3 4
VALVE CLOSED
LIMITED BLEED
VALVE OPEN FLOW
JET BLEED EQUALIZATION
JET BLEED OPEN VALVE OPEN EXCESS FLOW VALVE
JET
BLEED
Figure 2. Operational Schematic
CAUTION
Excess ow valve closing ow rates are not
the same for half and full couplings. Verify
the coupling for the desired excess ow rate.
Do not install the valve in any piping tending
to restrict the valve inlet because this may
prevent the excess ow valve from closing.
Do not install the valve with such extreme
torque that the coupling can cut threads into
the valve. This could cause valve distortion
and affect the internal working parts.
Do not use PTFE tape as it may cause thread
galling to occur.
Use an appropriate pipe compound, on the male threads
of the internal valve and pipeline. Pull the valve into
the coupling hand tight and then wrench tighten it for
approximately two additional turns. Larger size valves
may require an additional amount of torque to obtain a
leak-free connection.
Keep piping from the valve outlet to the pump full size
and as short as possible with a minimum number of
bends. Reduction in pipe size to suit smaller pump inlets
should be made as close to the pump as possible using
forged reducers (swage nipples) or venturi tapers rather
than bushings. This assures minimum flow resistance and
efficient pump operation.
FLOW
FLOW
LIMITED
BLEED
CLOSED
LIMITED
BLEED
The valves have a break off section below the inlet pipe
thread which is intended to permit the lower valve body
to shear off in an accident, leaving the valve seat in the
tank. The break off section is designed for container
installations and will probably not provide shear
protection if the valve is installed in a pipeline.
A hydrostatic relief valve does not need to be installed
adjacent to the valve since the internal valve relieves
excessive line pressure into the tank.
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 ow into a tank
when the downstream line pressure exceeds tank pressure. If
you want to selectively ll 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
lled 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
3
Types C471, C477 and C486
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 specied 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 liqueed 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 certied 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 certication. The DCE certication must consider any
specications 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
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