Apollo Valves 61YLF-20-T1 Series Manuale di installazione, funzionamento e manutenzione - Pagina 4

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APOLLO

BRONZE SWING CHECK VALVE IOM GUIDE

Page 4 of

disc have a maximum permissible leakage rate per MSS SP-80 of 40ml of water per hour per inch of pipe

size. Soft-seated/resilient disc have bubble-tight seal during reverse flow.

MAINTENANCE

If the cap/hinge leaks, isolate and depressurize the unit. Check for damage or wear. If damage is due to

scratches or nicks, repair damage area by resurfacing to maintain flatness and seal using a thread

sealant.

Seat leakage can be resolved by:

Flushing seat area with high rate of flow through the valve. In some cases, foreign materials or debris

causes the disc to completely close allowing leak across the check. If seat leakage persists, dismantle

valve and verify cause.

Scratches or dents on seat and disc can be corrected by lapping disc while it is in the body. Apply

lapping compound on the disc and seat, and apply mild amount of pressure to lap both surfaces.

If lapping cannot resolve seat leakage, replace disc.

In Viton or PTFE disc, it is recommended to replace it.

Swing Check 61Y ES 1498 a.pdf.doc

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