AVR AVK Series Handbuch für Installation, Betrieb und Wartung - Seite 10

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10. Troubleshooting

Symptom:

Valve sticks

Cause:

Piston is stuck in the cylinder

Cure:

Disassemble, clean and lubricate the piston assembly. Replace worn or

damaged parts

Symptom:

Valve sticks

Cause:

Worn bushings and pins

Cure:

Replace worn parts

Symptom:

Water level is unstable

Cause:

Worn bushings and pins

Cure:

Replace worn parts

Symptom:

Valve leaks from main seal

Cause:

Worn or damaged main seal

Cure:

Replace main seal

Make sure the liquid is not chemically aggressive to the valve parts and that

the pressure/flow combination does not cause cavitation

Symptom:

Valve leaks from main seal

Cause:

Impurities between valve seat and main seal

Cure:

Clean the piston assembly and replace the seal if damaged.

Install a filter before the valve

Symptom:

Water drips down the valve from its upper side

Cause:

Defective piston seal

Cure:

Replace piston seal

Symptom:

Valve does not close

Cause:

Float leaky and filled with water

Cure:

Replace float

Check if corrosion is the reason in which case another float material should be

considered.

11. Recommended spare parts

Only genuine AVK spare parts should be used.

AVK accepts no responsibility for damage caused by failing non-AVK parts.

Following spare parts are recommended to purchase with a ser. 854 valve:

•

Seals

•

Gaskets

•

Lubricants

•

Touch up paint

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