INSTALLATION, OPERATION AND MAINTENANCE
VSI AWWA C508 RUBBER FLAPPER CHECK VALVE
VRSG-3
02-16
© 2014 VSI Waterworks LLC
8
SECTION 8: TROUBLESHOOTING
Problem
Cause
Correction
The valve will not seal
Interference between valve disc
and seating surface
Follow instructions for
disassembly(maintenance section) and
check for any interference
Uneven tightening of the cover or
accessories
Loosen then retighten bolts and nuts
evenly
Corrosion or debris in accessories
Follow instructions for
disassembly(maintenance section) and
clean accessories
Debris under disc
Follow instructions for
disassembly(maintenance section) and
clean out debris
Leakage between the
body and cover of the
valve
Bolts and nuts may be loose or
tightened irregularly
Loosen then retighten bolts and nuts
evenly
Cover Gasket may be damaged
Follow instructions for
disassembly(maintenance section) and
replace gasket
RARE: Crack in body or cover
Inspect and replace if necessary
Leakage at accessories
Damaged operator
Replace accessory in its entirety
Damaged o-rings
Valve fails pressure test
Valve is not completely closed
Close valve completely
Debris trapped under disc
Throttle valve from fully closed to
approximately 25% open several
times under line flow to clear debris.
If unsuccessful follow instructions for
disassembly and remove debris
Disc encapsulation or seat is
damaged
Follow disassembly instructions and inspect
for damage. If present replace damaged
parts.
