Instruction Manual
D100391X012
EDR and ETR Valves
April 2011
6
CAUTION
Take care when removing the bottom flange (key 31) in the following procedure, to prevent possible product damage from
parts unexpectedly falling out of the valve body.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in
effect while you work on the equipment. When removing the bottom flange (key 31), be careful that the cage and
other parts are not damaged by unexpectedly falling out of the valve body. Remove the nuts (key 16) or cap screws
from the bottom flange.
2. Removing the valve plug from the valve body, the valve plug can be removed independently of the valve stem by
removing the cotter pin and castle nut (keys 30 and 8). Then, slide the valve plug out of the cage (see figure 3).
D Disconnect the stem connector, and loosen the packing flange nuts (see figure 2).
D Move the valve stem away from the actuator stem allowing room to remove the indicator disk and stem locknuts.
Remove the parts indicated.
D Remove the valve plug by pulling the valve plug/stem assembly through the packing and out of the bottom of the
bonnet.
D If the valve plug is to be re‐used but the stem needs to be replaced, drive the pin (key 8) out of the plug/stem
assembly and unscrew the valve stem.
CAUTION
Take care during disassembly in the following procedure, to prevent possible damage to sealing surfaces.
3. Remove the seat ring (key 9), gaskets (keys 10, 11, 12, and 13), and any remaining parts if they did not come out
with the valve plug. If the seat ring (key 9) is stuck in the valve body, strike the outside of the valve body at the seat
ring line with a rubber hammer while pulling down on the seat ring. Carefully remove the seat ring without
damaging sealing surfaces.
If necessary, machine or grind metal seats before installing the piston ring/seal ring or packing, or refer to the Lapping
Metal Seats procedure in this section.
Lapping Metal Seats
A certain amount of leakage should be expected with metal‐to‐metal seating in any valve body. If the leakage
becomes excessive, however, the condition of the seating surfaces of the valve plug and seat ring can be improved by
lapping. (Deep nicks should be machined out rather than ground out.) Use a good quality lapping compound of a
mixture of 280 to 600‐grit.
Assemble the valve to the extent that the seat ring (key 9), cage (key 3), cage adaptor (key 4, if used), and bonnet are
in place. Also, remove the piston ring or seal ring from the valve plug (if used).
1. Insert the valve stem (key 7) into the bonnet and thread the plug (key 2) onto the end of the stem. Make a simple
handle from a piece of strap iron; lock it to the valve with the stem locknuts.
(28 pages)
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