Flowserve Valtek Mark 200 - Manual (Page 17)

17
Mark 200 Control Valve FCD VLENIM0200– 12/12
flowserve.com
11 DIN Valve Troubleshooting Chart
Problem Possible Cause Corrective Action
Stem motion impeded 1. Overtightened packing. 1. Refer to proper maintenance instructions and readjust.
2. Service temperature is beyond operating limits of trim design. 2. Reconfirm service conditions and contact factory.
Excessive leakage 1. Improperly tightened bonnet flange bolting. 1. Refer to step 11 of “Reassembling the Body” section for
correct tightening procedure.
2. Worn or damaged seat ring. 2. Disassemble valve and replace or repair seat ring.
3. Worn or damaged seat or bonnet gasket. 3. Disassemble and replace gaskets.
4. Inadequate actuator thrust. 4. Check for adequate multi turn actuator,
reconfirm service conditions and contact factory.
5. Incorrectly adjusted plug. 5. Refer to step 9 of “Reassembling the Body” section for correct
plug adjustment.
6. Improper flow direction. 6. Refer to original specifications or contact factory.
Inadequate flow 1. Improper plug adjustment, limiting stroke. 1. Refer to step 9 of “Reassembling the Body” section for
correct plug adjustment.
2. Service conditions exceed trim design capacity. 2. Verify service conditions and consult factory.
Plug slams 1. Trim sized too large for flow rate 1. Install reduced trim.