Flowserve Valtek MaxFlo 3 - Manual (Page 13)

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User Instructions - MaxFlo 3 - VLEEIM7001-03 07.07
3
12. TRoublEShooTINg
Failure Probable Cause Corrective Action
Valve moves to failure position, exces-
sive air bleeding from transfer case
1. Failure of cylinder actuator O-ring 1. Replace actuator O-ring
2. Failure of sliding seal assembly in cyl-
inder actuator
2. Repair or replace sliding seal assembly
Jerky shaft rotation 1. Overtightened packing 1. Retighten packing box nuts to slightly over finger-
tight for V-ring packing, 14 ft-lbs/19 Nm for braided
packing.
2. Improper adjustment of lever arm on
shaft causing arm to contact transfer
case
2. Redjust lever arm (see step 1 in Actuator Remount-
ing)
3. Cylinder wall of actuator not lubri-
cated
3. Lubricate cylinder wall with silicone lubricant
4. Worn piston O-ring allowing piston to
gall on cylinder wall
4. Replace O-ring; if galling has occurred replace all
damaged parts
5. Worn actuator stem O-ring causing
actuator stem to gall on stem collar
5. Replace O-ring; if actuator stem is galled replace it
6. Worn (or damaged) thrust bearings,
shaft bearing or packing followers
6. Disassemble and inspect parts; replace any worn or
damaged parts
Excessive leakage 1. Improper adjustment of external
stroke stops
1. See Actuator Remounting
2. Improper seat adjustment 2. See Seat Replacement
3. Worn or damaged seat 3. Replace seat
4. Damaged plug seating surface 4. Replace plug
5. Improper handwheel adjustment act-
ing as limit stop
5. Adjust handwheel until plug seats properly
Leakage through line flanges 1. Dirty line gasket surfaces 1. Clean gasket surfaces and reinstall valve
2. Improper sealing of line flanges 2. Tighten line flanges evenly and completely (see Table
1 for proper torque)
3. Flange or pipe misalignment 3. Reinstall valve in line; check piping system
Leakage through packing box 1. Loose packing box nuts 1. Tighten packing box nuts to slightly over finger-tight
for V-ring packing, 14 ft-lbs/19 Nm for braided pack-
ing.
2. Worn or damaged packing 2. Replace packing
3. Dirty or corroded packing 3. Clean body bore and stem, replace packing
Valve slams, wont open, or causes se-
vere water hammer
1. Improper valve installation 1. See step 2 in Installation and correct flow direction
Shaft rotates, plug remains open or
closed
1. Broken shaft 1. Replace shaft, make sure plug does not overstroke
and contact plug stop
Actuator operates, shaft does not rotate 1. Broken internal actuator parts 1. Refer to appropriate actuator maintenance instruc-
tions
Leakage through bonnet joint; leakage
from end post
1. Loose bolting or damaged gasket 1. Tighten bolting as recommended in Table II
2. Dirty gasket surfaces 2. Clean gasket surfaces, replace gaskets and retighten
bolting per Table II