Trim Replacement - Emerson Fisher EU Instruction Manual

Instruction Manual
D102010X012
5. Screw the new stem tightly into the valve plug. Drill through the stem, using a 1/4‐inch diameter drill for the 31.8
mm (1‐1/4 inch) stem diameter used in this valve. Use the hole in the valve plug as a guide. Remove any chips or
burrs, and drive in a new pin to lock the assembly.

Trim Replacement

Except where indicated, key numbers are shown in figure 5 and 6.
1. Proceed as appropriate:
For EUT‐2 or EWT‐2 valves:
For all sizes except NPS 12 and 16x12, turn the seat ring (key 9) into the cage (key 3) with a bar inserted through the seat
ring slots.
For NPS 12 and 16x12, insert cap screws into the two 3/8 inch UNC tapped holes in the bottom of the seat ring (key 9).
Use a bar to pry against the cap screws and turn the seat ring (key 9) into the cage (key 3).
For all sizes, 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. Install the seat ring seal ring (key 6) so that its open side faces the valve stem for Cavitrol III trim
and flow‐down standard cages. Reverse the seal ring for Whisper Trim III, WhisperFlo, and flow‐up standard cages.
Lubricate the seal ring with a general‐purpose, lithium‐base lubricant, and place it over the bottom end of the seat
ring. Start the ring in the groove on one side of the seat ring, and gently work it over the seat ring.
For EUD and EWD valves (figure 6) and EUT and EWT valves (figure 7), install the seat ring gasket (key 13).
Temporarily install screws or bolts into the tapped holes in the seat ring (key 9), making sure the seating surface is
facing up. Lower the seat ring into the valve body. Remove the temporary screws or bolts.
Secure the seat ring (key 9) with the cap screws (key 49). Tighten the cap screws in a criss‐cross pattern to a torque of
39 NSm (29 lbfSft) for NPS 12 and NPS 16x12 valves and to 92 NSm (68 lbfSft) for NPS 16 through NPS 24x20 valves.
2. Install a cage gasket (key 11) into the valve. Temporarily install screws or bolts into the tapped holes in the top of
the cage assembly (key 3) to help while installing this piece into the valve. Any rotational orientation of the cage or
assembly with respect to the valve is acceptable.
For EUT‐2 and EWT‐2 valves, use care to avoid damaging the seat ring seal ring and cage seating surfaces while
handling the heavy parts. To help insert the cage or assembly into the valve, lubricate the outside diameter of the seat
ring seal ring with lithium grease.
3. Slide the valve plug (key 2) and stem assembly into the cage.
For valves with a seal ring, make sure the valve plug seal ring (key 28) is evenly engaged in the entrance chamfer at the
top of the cage or cage assembly to avoid damaging the ring.
For valves with piston rings, make sure the rings are fully engaged into the piston ring groove and flush with the
outside diameter of the plug.
4. Install the bonnet gasket (key 10).
CAUTION
If the packing is to be reused and was not removed from the bonnet, use care when installing the bonnet to avoid
damaging the packing with the valve stem threads.
5. Mount the bonnet on the valve, and complete assembly according to steps 15 through 19 of the Replacing Packing
section, omitting steps 16 and 17 if new packing is not being installed and being sure to observe the note before
step 15.
EU and EW Series Valves
July 2017
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