Troubleshooting - Flowserve Valtek GS V701 User Instructions

Valtek GS
After these requirements are confirmed proceed with valve
maintenance.
WARNING
from all moving parts when operating the control valve can
cause serious injury.
1. Clear all dirt and / or foreign material from the plug
stem and control valve.
2. If leakage is detected, retighten the packing follower by
one full turn clockwise (See Table 7: Packing Adjust-
ment).
3. If retightening packing does not stop the leakage,
overhaul the control valve and replace the packing
(See Section 13: Disassembly and Reassembly).
4. If leakage is detected, retighten bonnet and flange
bolting.

12 Troubleshooting

Contact customer service department or contract partner for any fault or defect found, otherwise
the manufacturer's guarantee shall be rendered null and void and the manufacturer released from
any responsibility. If the user performs the repairs, these User Instructions must be adhered to and
carried out in a competent manner. Original Equipment Manufacturer spare parts must be used to
make the repair.
Defect
Stem does not move
Jerky stem movement
10
FCD VLEEIM0300-05 (EN/A4) November 2022
Crushing hazard ! Failure to keep
hands, hair, and clothing away
No. Possible Causes
1.1 • No auxiliary
(pneumatic air or electrical power)
to actuator
(positioner, air filter regulator,
solenoid valve, limit switch, and/
or special accessories)
1.2 • Mounted accessories do not work
1.3 • Pneumatic actuator is defective
1.4 • Electric actuator is defective
1.5 • Excessive tightening of the pack-
ing box
1.6 • Valve trim worn or stuck
2.1 • Damaged stem
5. Make sure all nuts and bolts are securely fastened.
6. If possible, stroke the valve and check for smooth,
full-stroke operation. Unsteady stem movement could
indicate an internal valve problem.
7. Make sure all accessory brackets and bolting are
securely fastened.
8. Check control valve health parameters:
• Characteristic curves of the valve with flow
• Upstream pressure
• Downstream pressure
into the control room.
NOTICE
differ by more than 5%, an overhaul may be required.
Remedy
energy supply • Pneumatic actuators:
and accessories
• Electrical actuators:
• See User Instructions for accessory manufacturer
• Contact customer service department or contract
partner
• See user instructions of the actuator manufacturer
• Loosen packing follower until valve operates
properly
NOTICE !
• Contact customer service department or contract
partner
• Contact customer service department or contract
partner
Monitor trim and bonnet compo-
nents. If nominal and actual values
Check supply for leaks
Check air pressure (usually 87 psig; 6 bar)
Check power supply (connections, circuit
breakers, voltage)
Make sure there are no leaks.