Emerson C471, C486, C477 Instruction Manual
Instruction Manual
D450229T012
February 2019
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.
P1197
TYPE C477
TYPE C471
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
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 Anhydrous
Ammonia (NH3) at ambient temperatures, the valves
TYPE C486
Figure 1. C471, C477 and C486 Series Internal 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.
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.
Types C471, C477 and C486
Specications
The Specications section on the following page shows specications for Types C471, C477 and C486
internal valves.
Body Size and End Connection Styles
Types C471 and C477
Inlet: 2 or 3 in. MNPT / DN 50 or 80
Outlet: 2 or 3 in. FNPT / DN 50 or 80
Type C486
Inlet: 3 in. CL300 RF Flange / DN 80
Outlet: 3 in. 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 in. / DN 50 Sizes: 105, 150 and 250 GPM /
397, 567 and 946 L/min
3 in. / DN 80 Sizes: 160, 265, 375 and 460 GPM /
605, 1003, 1419 and 1741 L/min
Type C470 Full Coupling Flows:
2 in. / DN 50 Sizes: 60, 80 and 130 GPM /
227, 302 and 492 L/min
3 in. / DN 80 Sizes: 120, 230, 320 and 380 GPM /
454, 870, 1211 and 1438 L/min
Maximum Allowable Inlet Pressure
(1)
400 psig / 27.6 bar WOG
Temperature Capabilities
(1)(2)
-20 to 150°F / -29 to 66°C
Approximate Weights
2 In. / DN 50 Sizes:
Type C471: 11 lbs / 5.0 kg
Type C477: 9 lbs / 4.1 kg
3 In. / DN 80 Sizes:
Type C471: 21 lbs / 10 kg
Type C477: 16 lbs / 7.3 kg
Type C486: 20 lbs / 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: Polytetrauoroethylene (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.
Kalrez® is a mark owned by E.I. du Pont de Nemours and Co.
2
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.
Types C471, C477 and C486
M1170
JET
BLEED
1
VALVE CLOSED JET BLEED OPEN VALVE OPEN EXCESS FLOW
LIMITED BLEED
VALVE OPEN FLOW
JET BLEED EQUALIZATION
2 3 4
JET
BLEED
Figure 2. Operational Schematic
Note
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 ow greater than
the valve’s excess ow spring rating or a sufcient
surge in ow forces the main poppet closed against
the excess ow 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
FLOW LIMITED
FLOW
BLEED
VALVE CLOSED
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.
LIMITED
BLEED
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.
3
Types C471, C477 and C486
O.D. AND THICKNESS TO SUIT
CONTAINER SPECIFICATIONS
3 IN. ASME CL300 RF FLANGE MODIFIED
(BORE 4-5/8 IN. / 117 mm DIAMETER
AND 5-3/4 IN. / 146 mm RF)
TANK
C
45°
T10489
D MAX
E
B
A
IN. / mm
1 / 25
MINIMUM
3/4-IO UNC
Figure 3. Tank Flange Dimensions
PUMP OR
PIPING
Figure 4. Valve Installation Schematic
Table 1. Tank Connections
MODIFIED
CL300 ASME RF
FLANGE
3 in. / DN 80 6.62 8 0.75 5.75 / 146 0.06 / 1.5 1.50 / 38 4.62 / 117 8.25 / 210
1. Can be increased up to 4.81 in. / 122 mm for 3 in. valve, if valve and gasket are centered with modied ange opening.
DBC No. Size
A
For NPT connections, 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.
DIMENSION, IN. / mm
B
RF
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.
RF
C
D E (Modied)
(1)
3 IN. FNPT
MATING
FLANGE O.D.,
IN. / mm
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 ow resistance and efcient pump operation.
4
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.
Types C471, C477 and C486
Type C486 Flange Installation
Lightly coat both sides of a spiral-wound, or other
suitable, ange gasket with silicone grease or
equivalent. An NPS 3 / DN 80, CL300 ASME RF ange
with a modied bore (see Figure 3) must be installed in
the tank. Special stud bolts, furnished with the valve,
are assembled into this ange. The internal valve
and ange gasket can then be installed as shown in
Figure 4 with good ange 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 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 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.
5
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