Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
12
For ED/EWD and ET-C/EWT-C Valves,
using the below procedure, disassemble the seat ring from the valve body:
a. Unscrew the seat ring cap screws (key 49).
b. Install 3/8”-16 eye bolts with a minimum threaded length of 0.5 inches into the two equally spaced tapped holes
in the top of the seat ring (key 9).
c. Carefully lift the seat ring out of the valve body using the eye bolts as lifting points.
d. Set the seat ring on a protective surface.
e. Remove the seat ring gasket (key 13) from the valve body.
6. Cover the opening in the valve to protect the gasket surface and prevent foreign material from getting into the
valve body cavity. Inspect parts for wear and damage which would prevent proper operation of the valve. If the cage
requires replacement take note that for ET/EWT valves a replacement is available individually (key 3 only) or as a
cage and seat ring assembly (key 3 and 9). The valve plug and seat ring, along with their respective sealing parts, will
be inspected in the Valve Plug and Seat Ring maintenance procedures.
Valve Plug Maintenance
With the valve plug and stem assembly (key 2) removed according to the Disassembly procedure, proceed as
appropriate:
CAUTION
Be careful not to scratch the surfaces of the seal ring grooves in the valve plug (key 2A) or any surfaces of the replacement
parts.
For ET/EWT Valves
1. Carefully pry or cut out the plug seal ring (key 28) from its groove in the valve plug (key 2A). Discard the old plug
seal ring.
2. Inspect the valve plug (key 2A) and stem (key 2B) for nicks, scratches, or other damage that would prevent proper
operation of the valve. If replacement of either is necessary, replace as a complete valve plug and stem assembly
(key 2).
CAUTION
To avoid damaging the seal ring, slowly and gently stretch it for the following procedure. Avoid jerking sharply on the ring.
3. Install the replacement plug seal ring (key 28) with the open side facing the top or bottom of the valve plug,
depending on flow direction. The open side of the seal ring should face up (toward the actuator) in flow-up
installations and down in flow-down installations.
To install the seal ring on the valve plug, first lubricate it with a general purpose silicone-base lubricant. Then gently
stretch the seal ring and work it over the top edge of the valve plug. 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 valve plug may make it seem unduly loose when in the groove, but it will contract to its original size after
insertion into the cage.
