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Instruction Manual
D100381X012
c. Use the turning bar to unscrew the seat ring. Stuck seat rings may require additional force on the turning bar.
Apply a steady force to the turning bar and hit the other end of the bar with a heavy hammer as hard as possible
to break the ring loose. In addition, a 24- or 36-inch pipe wrench can be used on the drive wrench near the hold
down clamp. Applying penetration oil to the seat ring before attempting to remove it will facilitate the
operation.
d. After the seat ring is loose, alternately unscrew the flange bolts (or hex nuts) on the hold-down clamp and
continue to unscrew the seat ring.
e. Before installing new ring(s), thoroughly clean the threads in the valve port(s). Apply pipe compound to the
threads of the new seat ring(s).
Note
On double-port valves, one of the seat rings is smaller than the other. On direct-acting valves (push-down-to-close action), install
the smaller ring in the valve body port farther from the bonnet before installing the larger ring.
Screw the seat ring(s) into the valve. Use the seat ring puller, to tighten the seat rings in the valve to the torque values
specified in table 6 and 7. Remove all excess pipe compound after tightening. The seat ring can be spot welded in
place to ensure that it does not loosen.
6. Reassemble the valve in the reverse order of the procedure used to disassemble. Use new bonnet and bottom
flange gaskets when reassembling.
7. Mount the actuator and adjust the stem connector per the Mounting Actuator and Adjusting Travel section and the
appropriate actuator instruction manual.
Table 6. HS Single Port Seat Ring Torque Values
VALVE SIZE, NPS
Table 7. HS Double Port Seat Ring Torque Values
VALVE SIZE, NPS
1.5
2
3
4
6
8
10
1
1.5
2
3
4
6
8
TOP SEAT RING TORQUE (ftSlbs)
235
425
320
550
1845
6190
5800
TORQUE (ftSlbs)
145
230
270
470
745
2635
3345
BOTTOM SEAT RING TORQUE (ftSlbs)
195
315
300
510
1705
4920
4605
HS Valve
June 2019
11
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