INSTALLATION, OPERATION AND MAINTENANCE
VSI AWWA C508 RUBBER FLAPPER CHECK VALVE
© 2014 VSI Waterworks LLC
VRSG-3
02-16
9
SECTION 9: DISASSEMBLY AND REASSEMBLY
ATTENTION: DO NOT WORK ON ANY VALVE UNDER PRESSURE
Sec. 9.1 Basic Valve Disassembly and Reassembly
1.
Shut off line flow fully and equalize pressure across valve by backflush attachment or other means
2.
Remove bonnet cover bolts and washers
3.
Remove disc from valve body
4.
Inspect and replace disc if it is damaged. There should be no cracks or deformation.
5.
Clean all seating and mating surfaces before beginning reassembly
6.
Replace disc into valve body
7.
Replace bonnet cover using new seal
8.
Reinstall cover bolts and washers
9.
Tighten to 90 ftlbs using a cris-cross pattern
10.
Return valve to service and check for leaks
Sec. 9.2 Backflush Attachment Disassembly and Reassembly
1.
Shut off line flow fully.
2.
Screw backflush attachment fully inward by rotating in a clockwise direction to equalize pressure across
valve.
3.
Loosen and remove the entire backflush attachment at its hex base.
4.
Inspect for bends, nicks, or other damage. Replace if damaged.
5.
Replace backflush attachment using new seal and teflon thread sealant
6.
Screw backflush attachment fully outward by rotating in a counterclockwise direction
7.
Return valve to service and check for leaks
Sec. 9.3 Indicator Atachment Disassembly and Reassembly
1.
Shut off line flow fully.
2.
Equalize pressure across valve by backflush attachment or other means
3.
Remove packing seal nut from cover of valve by loosening hex counterclockwise
4.
Inspect and replace o-rings if necessary
5.
Lift indicator shaft and disc and polish with extra fine 800 grit or higher sand paper to remove nicks or
damage
6.
Reinstall packing seal nut using new seal and teflon thread sealant
7.
Return valve to service and check for leaks.
