Instruction Manual Supplement
D104372X012
Large EH
August 2018
5
5. Install the replacement seat ring seal with the open side facing up (toward the top of the seat ring). The open side of
the seal ring should face down (toward the bottom of the valve body) in flow-up installations and up in flow down
installations.
To Install the seal ring on the seat ring, first lubricate with a general-purpose silicone-base lubricant. Then gently
stretch the seal and work it over the bottom edge of the seat ring. The PTFE material in the seat ring must be
permitted time to cold-flow during the stretching procedure, so avoid pulling sharply on the ring. Stretching the
seal ring over the seat ring may make it seem unduly loose when in the groove, but it will contract to its original size
after insertion in the valve body.
6. Install a new lower cage gasket into the valve body.
7. Make sure the eye bolts that were installed in the cage assembly during the disassembly procedure are still
installed. Then using the eye bolts as lifting points, carefully lower the cage/seat ring assembly into the valve. Using
care to avoid damaging the seat ring seal ring and cage seating surfaces while handling the heavy parts. To help
insert the cage/seat ring assembly into the valve, lubricate the outside diameter of the seat ring seal ring with a
general-purpose silicone-based lubricant.
8. Carefully lower the valve plug/stem assembly into the cage, being careful not to damage any surfaces of the cage,
seat ring or plug. Make sure the seal ring is evenly engaged in the entrance chamfer at the top of the cage assembly
to avoid damage to the ring.
9. Install a new upper cage gasket on top of the cage flange assembly.
10. Mount the bonnet on the valve body.
11. Divide the body-to-bonnet torque value into smaller, equal increments of torque. As the final torque is 6915 N
•
m
(5100 ft
•
lb), divide into smaller equal increments of 1152 N
•
m (850 ft
•
lb) of torque. Then follow the torquing
sequence (figure 2) and torque the hex nuts to the first increment of torque. When all the hex nuts are at this first
torque valve, follow the bolting torque sequence and torque the hex nuts to the second increment of torque.
Repeat until the hex nuts are all tightened to the specific final torque value of 6915 N
•
m (5100 ft
•
lbf). If any of the
hex nut turns at the final torque, tighten all hex nuts to the final torque again.
12. Install the packing and actuator per the instructions in the manual (
, observe all warnings, cautions
and notes.
