Instruction Manual

Instruction Manual
D103803X012
Z500 Valve
April 2015 - rev B
9
Troubleshooting
Operation
D Stem adapter/actuator may be misaligned-- Remove actuator and stem adapter, then reassemble per assembly
procedures for actuators.
D Over-tightened stem packing-- Loosen packing to hand tight, cycle valve and retighten per procedures following
torque table 5.
D Inadequate air supply-- Increase air supply or install larger solenoid or quick exhaust valve. Refer to actuator
manufacturer's specifications.
Valve will not Rotate
D Valve body ID or bore is clogged-- Flush or clean valve ID and try to cycle valve.
D Actuator is not operating correctly or has failed-- Replace or repair actuator and try to cycle valve.
D Stem keys have sheared-- Remove stem adapter and determine why keys sheared, insert new keys, reassemble and
try to cycle valve.
Valve Stem Packing Leaking
D Packing flange bolting is loose-- Tighten packing bolting. See Packing Replacement section, step 7 on page 13 of
this instruction manual.
D Packing is damaged or improperly installed-- Depressurize valve, remove old packing and replace with new
assembly per assembly instruction steps 3 to 5.
D Actuator misalignment-- Check for actuator misalignment.
Valve Body Gasket Leaking
D Body bolting is loose-- Tighten body bolting per table 4 and figure 2.
D Body gasket damaged-- Contact your Emerson Process Management sales office
.
Table 4. Body Bolt Torque Values
BOLT SIZE RECOMMENDED TORQUE
mm Inch lbf•ft lbf•in N•m
13 1/2 20 240 27
16 5/8 40 480 54
19 3/4 65 780 88
22 7/8 110 1320 149
25 1 165 1980 224
29 1-1/8 240 2880 325
32 1-1/4 335 4020 454
35 1-3/8 450 5400 610
38 1-1/2 600 7200 814
41 1-5/8 725 8700 984
44 1-3/4 1000 12000 1356