Emerson C471 Instruction Manual page 4

Types C471, C477 and C486
O.D. AND THICKNESS TO SUIT
CONTAINER SPECIFICATIONS
C
45°
T10489
Figure 3. Tank Flange Dimensions
MODIFIED
CL300 ASME RF
FLANGE
DBC
3 in. / DN 80 6.62
1. Can be increased up to 4.81 in. / 122 mm for 3 in. valve, if valve and gasket are centered with modified flange opening.
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.
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.
4
D MAX
E
B
A
IN. / mm
Table 1. Tank Connections
A
No. Size
8 0.75
1 / 25
MINIMUM
3/4-IO UNC
Figure 4. Valve Installation Schematic
DIMENSION, IN. / mm
B C
RF RF
5.75 / 146 0.06 / 1.5
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.
3 IN. ASME CL300 RF FLANGE MODIFIED
(BORE 4-5/8 IN. / 117 mm DIAMETER
AND 5-3/4 IN. / 146 mm RF)
TANK
PUMP OR
PIPING
D E (Modified)
(1)
1.50 / 38 4.62 / 117
3 IN. FNPT
MATING
FLANGE O.D.,
IN. / mm
8.25 / 210