Troubleshooting; Ordering Spares - Emerson KTM VIRGO N Series Installation, Operation And Maintenance Instructions

KTM VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

9 TROUBLESHOOTING

Problem
Leakage across closed valve
Valve too hard to operate / valve
torque too high / stick-slip operation
Leakage through stem
Leakage through body to adapter
joint; body to housing joint
Leakage through drain, vent and
sealant fittings.

10 ORDERING SPARES

When ordering spares, please furnish the following information.
Size
Class
Batch number / serial number
Manufacturing date
Part number
Part name
Purchase order number
Possible cause
1. Damaged ball surface.
2. Damaged seats / seat seals.
3. Ball not closed fully.
4. Seat not moving freelyresulting in inadequate contact
between ball and seat.
1. Damaged seats / seat seals /ball.
2. Seat not moving freely due to accumulation of dirt,
debris, corrosion between seat and body or seat and ball.
3. Operator not sized properly, damaged operator parts.
4. Actuator not sized properly, damaged actuator
parts, insufficient input air/gas pressure to actuator,
restriction/clogging of actuator vent.
1. Loose gland fasteners.
2. Damaged stem, stem sealing surface.
3. Damaged stem seal.
4. Accumulation of dirt, debris, corrosion between stem
and housing.
1. Damaged seal/gasket.
2. Relaxation of joint fasteners.
3. Accumulation of dirt, debris, corrosion between body
and adapter.
1. Loosening of fittings.
Available on name plate or body of the valve
Available on name plate or body of the valve
Available on name plate or body of the valve
Available on name plate or body of the valve
Available on general arrangement drawing
Available on general arrangement drawing
Available on general arrangement drawing
Remedy
1. Refurbish or replace the ball.
2. Refurbish or replace seats.
Replace seat seals.
3. Check and reset ball.
Open/close settings.
4. Open valve, check for accumulation of dirt, debris,
corrosion between seat and body, clean and re-assemble.
1. Refurbish or replace the seats /seat seals / ball.
2. Open valve, clean and reassemble.
3. Select correct operator and replace.
4. Select correct actuator and replace. Check input air
supply, clean actuator vent.
1. Tighten the fasteners.
2. Refurbish or replace the stem.
3. Replace the stem seal.
4. Open valve, clean and reassemble.
1. Replace seal/ gasket.
2. Retighten the fasteners evenly in criss-cross manner.
3. Open valve, clean and reassemble.
1. Retighten. If leakage persists may require fresh thread
sealant or replacement of fitting. Do not remove fittings
when valve / body cavity is under pressure.
8