Troubleshooting - Flowserve Valtek MaxFlo 4 User Instructions

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
severe water hammer
Shaft rotates, plug remains open or
closed
Actuator operates, shaft does not rotate 1. Broken internal actuator parts
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
1. Failure of cylinder actuator O-ring
2. Failure of sliding seal assembly in cylinder
actuator
1. Overtightened packing
2. Improper adjustment of lever arm on shaft
causing arm to contact transfer case
3. Cylinder wall of actuator not lubricated
4. Worn piston O-ring allowing piston to
gallon 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
1. Improper adjustment of external stroke
stops
2. Improper seat adjustment
3. Worn or damaged seat
4. Damaged plug seating surface
5. Improper handwheel adjustment acting as
limit stop
1. Dirty line gasket surfaces
2. Improper sealing of line flanges
3. Flange or pipe misalignment
1. Loose packing box nuts
2. Worn or damaged packing
3. Dirty or corroded packing
1. Improper valve installation
1. Broken shaft
1. Loose bolting or damaged gasket
2. Dirty gasket surfaces
Valtek MaxFlo 4 FCD VLENIM0064-01-A4 – 11/15
6 - Shaft Direction
Left U Shaft Upstream
Right D Shaft Downstream
Top (Default)
Bottom*
5
1. Replace actuator O-ring
2. Repair or replace sliding seal assembly
1. Retighten packing box nuts to slightly over finger-tight for V-ring
packing, 14 ft-lbs/19 Nm for braided packing.
2. Redjust lever arm (see step 1 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 damaged parts
1. See Actuator Remounting
2. See Seat Replacement
3. Replace seat
4. Replace plug
5. Adjust handwheel until plug seats properly
1. Clean gasket surfaces and reinstall valve
2. Tighten line flanges evenly and completely (see Table 1 for proper
torque)
3. Reinstall valve in line; check piping system
1. Tighten packing box nuts to slightly over finger-tight for V-ring
packing, 14 ft-lbs/19 Nm for braided packing.
2. Replace packing
3. Clean body bore and stem, replace packing
1. See step 2 in Installation and correct flow direction
1. Replace shaft, make sure plug does not overstroke and contact
plug stop
1. Refer to appropriate actuator maintenance instructions
1. Tighten bolting as recommended in Table II
2. Clean gasket surfaces, replace gaskets and retighten bolting per
Table II
6
Corrective Action
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