Assembly - Fisher 461 Instruction Manual

461 Valve
June 2017
Table 4. Recommended Torque for Valve Body to Bonnet Nuts
VALVE SIZE, NPS PRESSURE RATING
CL300
CL600
CL900
2x3
CL1500
CL2500
CL300
CL600
CL900
3x4
CL1500
CL2500
CL300
CL600
CL900
4x6
CL1500
CL2500
CL300
CL600
6x8
CL900
CL1500

Assembly

1. When assembling, use a new bonnet gasket (key 6), and wipe all sealing surfaces (valve body, bonnet, and gaskets)
with a clean cloth. If the seat ring (key 2) was removed, install it in the valve body (key 1), and then torque the seat
ring retainer (key 4) into the valve body. Since there is no gasket between the seat ring and the valve body, make
sure that the mating surfaces are clean and free of nicks and scratches.
2. Replace the liner (key 5). Then, slide the valve plug and stem assembly (keys 3 and 10) into the valve body (key 1).
3. Mount the bonnet (key 14) onto the valve body (key 1), being careful not to damage the gasket.
Note
If the seating surfaces of the valve plug and seat ring require lapping, refer to the Lapping Seating Surfaces section before
continuing to assemble the valve.
CAUTION
Avoid product damage in the following step by taking care not to damage the packing while installing the bonnet.
4. If it is necessary to replace the packing, perform steps 10 through 16 of the Replacing Packing section. However, if it
is not necessary to replace the packing, make sure to install the bonnet carefully on the valve body to avoid
damaging the packing with the valve stem threads.
5. Lubricate the valve body studs and nuts (key 7) with anti-seize lubricant, and install the nuts (key 8) on the bolts.
Tighten the nuts in a crisscross pattern to no more than 1/4 of the nominal torque value specified in table 4 to
ensure a positive seal and even pressure on the bonnet.
12
STUD DIAMETER,
INCHES
NSm
373
373
7/8
373
373
1-1/8 522
373
7/8
373
522
1
522
1-1/2 1247
522
1
522
942
1-1/4
942
1-3/4 2670
522
1
522
1247
1-1/2
1247
TORQUE
B7/2H
lbfSft
275
275
275
275
385
275
275
385
385
920
385
385
695
695
1970
385
385
920
920
Instruction Manual
D100714X012
S20910
NSm lbfSft
339 250
339 250
339 250
339 250
522 385
339 250
339 250
502 370
502 370
1247 920
502 370
502 370
942 695
942 695
2670 1970
502 370
502 370
1247 920
1247 920