Pipe Mounting Orientation Codes; Troubleshooting - Flowserve Valtek MaxFlo 3 Installation Operation & Maintenance

15 PIPE MOUNTING ORIENTATION CODES

3 - Air Action
O Air-to-open - ATO
C Air-to-close - ATC
AT
3
* Not available on diaphragm actuators

16. TROUBLESHOOTING

Failure
Valve moves to failure position, exces-
sive air bleeding from transfer case
Jerky shaft rotation
Excessive leakage
Leakage through line flanges
Leakage through packing box
Valve slams, wont open, or causes se-
vere water hammer
Shaft rotates, plug remains open or
closed
Actuator operates, shaft does not rotate
Leakage through bonnet joint; leakage
from end post
®
4 - Pipe Configuration 5 - Actuator Orientation
L Left Hand Mounting L
R Right Hand Mounting R
D Flow Down T
U Flow Up B
4
Probable Cause
. Failure of cylinder actuator O-ring
. Failure of sliding seal assembly in cyl-
inder actuator
. Overtightened packing
. Improper adjustment of lever arm on
shaft causing arm to contact transfer
case
3. Cylinder wall of actuator not lubri-
cated
4. Worn piston O-ring allowing piston to
gall on cylinder wall
5. Worn actuator stem O-ring causing
actuator stem to gall on stem collar
6. Worn (or damaged) thrust bearings,
shaft bearing or packing followers
. Improper adjustment of external
stroke stops
. Improper seat adjustment
3. Worn or damaged seat
4. Damaged plug seating surface
5. Improper handwheel adjustment act-
ing as limit stop
. Dirty line gasket surfaces
. Improper sealing of line flanges
3. Flange or pipe misalignment
. Loose packing box nuts
. Worn or damaged packing
3. Dirty or corroded packing
. Improper valve installation
. Broken shaft
. Broken internal actuator parts
. Loose bolting or damaged gasket
. Dirty gasket surfaces
User instructions - MaxFlo 3 - VLENIM0052-02 02.07
6 - Shaft Direction
Left U Shaft Upstream
Right D Shaft Downstream
Top (Default)
Bottom*
5
Corrective Action
. Replace actuator O-ring
. Repair or replace sliding seal assembly
. Retighten packing box nuts to slightly over finger-tight for
V-ring packing, 4 ft-lbs/9 Nm for braided packing.
. Redjust lever arm (see step  in Actuator Remounting)
3. Lubricate cylinder wall with silicone lubricant
4. Replace O-ring; if galling has occurred replace all damaged
parts
5. Replace O-ring; if actuator stem is galled replace it
6. Disassemble and inspect parts; replace any worn or dam-
aged parts
. See Actuator Remounting
. See Seat Replacement
3. Replace seat
4. Replace plug
5. Adjust handwheel until plug seats properly
. Clean gasket surfaces and reinstall valve
. Tighten line flanges evenly and completely (see Table  for
proper torque)
3. Reinstall valve in line; check piping system
. Tighten packing box nuts to slightly over finger-tight for
V-ring packing, 4 ft-lbs/9 Nm for braided packing.
. Replace packing
3. Clean body bore and stem, replace packing
. See step  in Installation and correct flow direction
. Replace shaft, make sure plug does not overstroke and
contact plug stop
. Refer to appropriate actuator maintenance instructions
. Tighten bolting as recommended in Table II
. Clean gasket surfaces, replace gaskets and retighten bolt-
ing per Table II
6
5