EU and EW Series Valves
Instruction Manual
August 2010
13
Figure 6. Seal Ring and Piston Ring Details
B2425 / IL
SEAL RING FOR
EUT-2 AND EWT-2 VALVES
PISTON RINGS FOR
EUD AND EWD VALVES
FLOW UP
PEEK ANTI-EXTRUSION RINGS
FLOW DOWN
21B2120-A
A6137 / IL
2
27
29
28
2
27
29
28
SEAL RING FOR
EUT AND EWT VALVES
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.
