Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
17
6. Tack weld the seat ring to the cage using minimal heat. Two welds, 6 mm (1/4-inch) long and 180 degrees apart,
are required.
CAUTION
To avoid damaging the seal ring, slowly and gently stretch it for the following procedure. Avoid jerking sharply on the ring.
7. Install the replacement seat ring seal ring (key 223) with the open side facing the top or bottom of the seat ring,
depending on flow direction. 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 it with a general purpose silicone-base lubricant. Then gently
stretch the seal ring and work it over the bottom edge of the seat ring. The PTFE material in the seal ring must be
permitted time to cold-flow during the stretching procedure, so avoid jerking 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 into the valve body.
For ET/EWT Valves Equipped with HTS1 Seals
1. Carefully pry the seat ring retaining ring (key 221) from its groove in the seat ring (key 9). Then remove the seat ring
seal ring (key 223), backup ring (key 220), and anti-extrusion ring (key 219). Inspect the retaining ring and backup
ring for damage and replace as needed. Discard the old seat ring seal ring and anti-extrusion ring.
2. Then inspect the seat ring (key 9) for nicks, scratches, or other damage that would prevent proper operation of the
valve. Replace the seat ring if necessary. A replacement seat ring is available individually (key 9 only) or as a seat ring
and cage assembly (key 9 and 3). If replacing individually proceed to step 3, otherwise proceed directly to step 7.
3. Make sure the bolts or cap screws that were installed in the seat ring during the Disassembly procedure are still
installed.
4. Orient the cage and seat ring so that the threads on each are facing one another for assembly. The bottom of the
cage should be facing the top of the seat ring.
5. Using a pry bar to pry against the bolts or cap screws, turn the seat ring clockwise into the cage until tight.
Afterwords remove the two bolts or cap screws.
6. Tack weld the seat ring to the cage using minimal heat. Two welds, 6 mm (1/4-inch) long and 180 degrees apart,
are required.
7. Install the replacement seat ring seal ring (key 223) and anti-extrusion ring (key 219) with the open side of the seal
ring facing the top or bottom of the seat ring, depending on flow direction. 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. Make
sure the anti-extrusion ring is adjacent to closed side of the seal ring. Then install the seat ring backup ring (key 220)
and retaining ring (key 221).
To install the parts on the seat ring, first lubricate each with a general purpose silicone-base lubricant. Then gently
slide each over the bottom edge of the seat ring.
For ED/EWD and ET-C/EWT-C Valves
1. Inspect the seat ring (key 9) for nicks, scratches, or other damage that would prevent proper operation of the valve.
Replace if necessary.
