Check Disc Replacement
When installing a new check disc, fiber spacer
washers between the retainer and guide MAY or
MAY NOT be required.
Fiber spacer washers (item 33) are installed to
ensure the proper “squeeze” on the disc (item 6).
Too many washers will not allow sufficient
squeeze on the disc (not a water tight seal). This
will cause the check valve to fail.
Too few washers between the guide and retainer
can generate TOO MUCH squeeze on the disc,
causing it to bulge around the guide. This will
also cause the check to fail.
Proper squeeze on the disc is achieved when
the disc cannot be rotated and no bulge
appears.
Summary of Contents for 18-4
Page 1: ...Model 18 4 3 10...
