Instruction Manual

Instruction Manual
D100390X012
ED Valve
October 2014
11
Table 4. Recommended Torque for Packing Flange Nuts
VALVE STEM DIAMETER
PRESSURE RATING
GRAPHITE TYPE PACKING PTFE TYPE PACKING
Minimum
Torque
Maximum
Torque
Minimum
Torque
Maximum
Torque
mm Inches NSm LbfSin NSm LbfSin NSm LbfSin NSm LbfSin
9.5 3/8
CL125, 150 3 27 5 40 1 13 2 19
CL250, 300 4 36 6 53 2 17 3 26
CL600 6 49 8 73 3 23 4 35
12.7 1/2
CL125, 150 5 44 8 66 2 21 4 31
CL250, 300 7 59 10 88 3 28 5 42
CL600 9 81 14 122 4 39 7 58
19.1 3/4
CL125, 150 11 99 17 149 5 47 8 70
CL250, 300 15 133 23 199 7 64 11 95
CL600 21 182 31 274 10 87 15 131
25.4 1
CL300 26 226 38 339 12 108 18 162
CL600 35 310 53 466 17 149 25 223
31.8 1-1/4
CL300 36 318 54 477 17 152 26 228
CL600 49 437 74 655 24 209 36 314
4. Remove the load ring (key 26) from an NPS 8 ED valve, or the cage adaptor (key 4) from any restricted-trim valve
throughNPS4,andwrapitforprotection.
5. On an NPS 6 ED valve with a Whisper Trim III cage or WhisperFlo trim, remove the bonnet spacer (key 32) and
bonnet gasket (key 10) on top of the spacer. Then on any construction with a cage retainer (key 31), remove the
cage retainer and its associated gaskets. A Whisper Trim III and WhisperFlo cage retainer has two 3/8 inch-16 UNC
tappings in which screws or bolts can be installed for lifting.
6. Remove the cage or cage/baffle assembly (key 3) and the associated gaskets (keys 10, 11, and 12), and shim (key
51 for the ED valve, key 27 for the EAD valve). If the cage is stuck in the valve, use a rubber mallet to strike the
exposed portion of the cage at several points around its circumference.
7. Remove the seat ring or liner (key 9), seat ring gasket (key 13), and the seat ring adaptor (key 5) and adaptor gasket
(key 14) where used in a restricted-trim seat ring construction.
8. Inspect parts for wear or damage which would prevent proper operation of the valve. Replace or repair trim parts
according to the following procedure for Lapping Metal Seats or other valve plug maintenance procedures as
appropriate.
Lapping Metal Seats
CAUTION
To avoid damaging the ENVIRO-SEAL bellows seal bonnet assembly, do not attempt to lap the metal seating surfaces. The
design of the assembly prevents rotation of the stem and any forced lapping rotation will damage internal components of
the ENVIRO-SEAL Bellows Seal bonnet.
With metal-seat constructions, seating surfaces of the valve plug and seat ring or liner (keys 2 and 9, figure 19, 20, or
21) can be lapped for improved shutoff. (Deep nicks should be machined out rather than ground out.) Use a good
quality lapping compound of a mixture of 280 to 600-grit. Apply compound to the bottom of the valve plug.
Assemble the valve to the extent that the cage and the cage retainer and bonnet spacer (if used) are in place and the
bonnetisboltedtothevalve.Asimplehandlecanbemadefromapieceofstrapironlockedtothevalveplugstem
with nuts. Rotate the handle alternately in each direction to lap the seats. After lapping, remove the bonnet and clean
the seat surfaces. Completely assemble as described in the Assembly portion of the Trim Maintenance procedure and
test the valve for shutoff. Repeat the lapping procedure if leakage is still excessive.