Flowserve Valtek MaxFlo 3 User Manual
Page 15
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User instructions - MaxFlo 3 - VLENIM0052-02 02.07
5
16. TROUBLESHOOTING
Failure
Probable Cause
Corrective Action
Valve moves to failure position, exces-
sive air bleeding from transfer case
. Failure of cylinder actuator O-ring
. Replace actuator O-ring
. Failure of sliding seal assembly in cyl-
inder actuator
. Repair or replace sliding seal assembly
Jerky shaft rotation
. Overtightened packing
. Retighten packing box nuts to slightly over finger-tight for
V-ring packing, 4 ft-lbs/9 Nm for braided packing.
. Improper adjustment of lever arm on
shaft causing arm to contact transfer
case
. Redjust lever arm (see step in Actuator Remounting)
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 dam-
aged parts
Excessive leakage
. Improper adjustment of external
stroke stops
. See Actuator Remounting
. Improper seat adjustment
. 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
. Dirty line gasket surfaces
. Clean gasket surfaces and reinstall valve
. Improper sealing of line flanges
. Tighten line flanges evenly and completely (see Table for
proper torque)
3. Flange or pipe misalignment
3. Reinstall valve in line; check piping system
Leakage through packing box
. Loose packing box nuts
. Tighten packing box nuts to slightly over finger-tight for
V-ring packing, 4 ft-lbs/9 Nm for braided packing.
. Worn or damaged packing
. 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
. Improper valve installation
. See step in Installation and correct flow direction
Shaft rotates, plug remains open or
closed
. Broken shaft
. Replace shaft, make sure plug does not overstroke and
contact plug stop
Actuator operates, shaft does not rotate
. Broken internal actuator parts
. Refer to appropriate actuator maintenance instructions
Leakage through bonnet joint; leakage
from end post
. Loose bolting or damaged gasket
. Tighten bolting as recommended in Table II
. Dirty gasket surfaces
. Clean gasket surfaces, replace gaskets and retighten bolt-
ing per Table II
3 - Air Action
4 - Pipe Configuration
5 - Actuator Orientation
6 - Shaft Direction
O
Air-to-open - ATO
L
Left Hand Mounting
L
Left
U
Shaft Upstream
C
Air-to-close - ATC
R
Right Hand Mounting
R
Right
D
Shaft Downstream
D
Flow Down
T
Top (Default)
U
Flow Up
B
Bottom*
AT
3
4
5
6
* Not available on diaphragm actuators
15 PIPE MOUNTING ORIENTATION CODES