Flowserve Valtek Beta Positioners for Control Valves Instrukcja Użytkownika Pobierz pdf (Strona 19)

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Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611

Beta Positioner Troubleshooting

Failure Probable Cause Corrective Action

Valve won’t stroke, 1. Tubing to wrong ports 1. Retube to correct ports (see “Installation”

no excessive air section)

is exhausting 2. Cam action reversed 2. Refer to installation section and reverse cam

from positioner 3. Lever arm stuck 3. Work with stuck arm until it freely turns

4. Pilot spool stuck 4. Work spool by hand until it freely moves, or

remove spool and spool valve body and clean

thoroughly; replace if necessary

5. I/P module filter plugged 5. Remove I/P module and replace filter

6. I/P module failure 6. Replace I/P module

7. I/P mounting bolts loose 7. Tighten mounting bolts

Actuator goes to full 1. Broken feedback spring 1. Replace feedback spring

signal position, regard- 2. Linkage is disconnected, 2. Check and tighten all bolts and nuts in linkage,

less of signal stuck or missing parts make sure linkage doesn’t stick.

3. Pilot spool stuck 3. Work spool by hand until it freely moves, or

remove spool and spool valve body and clean

thoroughly; replace if necessary. Do not apply

grease to spool valve.

4. I/P module orifice plugged 4. Return I/P module to factory for service

Calibration shifts 1. Loose positioner mounting 1. Remove cover and check three screws

holding positioner to bracket, check two bolts

holding bracket to yoke

2. Loose linkage 2. Tighten all nuts and bolts on linkage

3. Loose zero adjustment 3. Tighten zero adjustment locking knob or range

locking knob adjustment locking knob adjustment after

calibrating knob

4. Worn arms or pins 4. Replace arms or pins, and apply grease

5. I/P mounting bolts loose 5. Tighten mounting bolts

Excessive air con- 1. Air leakage from O-rings 1. Remove spool valve; Check O-rings and replace

sumption (other than if necessary

normal exhaust) 2. Air leakage from tubing 2. Tighten or replace tubing fittings

3. Leaky cylinder piston 3. Replace O-rings in cylinder

O-rings

Actuator strokes very 1. Connection between 1. Retighten summing beam to diaphragm assembly

slowly in one direction capsule and beam with nut bottomed out against coil of spring (See

only improperly adjusted step 6 in “Removal & Repair of Instrument

Capsule Assembly”)

2. Tubing to cylinder is 2. Locate faulty tube and replace it

restricted

3. I/P module filter plugged 3. Remove I/P module and replace filter

Erratic operation 1. Dirt build-up inside 1. Disassemble; clean spool and body; add air filter

spool valve to air supply; if air filter exists, replace cartridge

2. Bent spool 2. Replace spool and valve block

3. Broken linkage or 3. Replace broken parts

positioner parts

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Flowserve Valtek Beta Positioners for Control Valves Instrukcja Użytkownika Strona 19

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