SECTION 7
HIGH PRESSURE WATER
May 2003
p. 7-17
49831951
7.3.2 Inlet Check Valve
1. Use a ½” flat bladed screwdriver to unscrew the poppet retainer from
the sealing head. The inlet check valve is disassembled.
2. Inspect and refinish the sealing head face seal surface per
instructions in Section 7.3.3.
3. Inspect both surfaces of the flat washer shaped poppet. If one
surface is marred, and the opposite surface is not, the poppet may be
reversed with the best surface facing the sealing head. If both sides
are worn, replace poppet.
4. Assemble poppet (2) and spring (7) on poppet retainer (11). Apply
small amount of Locktite 222 thread locker to thread of poppet
retainer, taking care not to get Locktite on poppet or other inlet check
valve sealing surfaces.
5. Tighten poppet retainer (11) using 1/2-in. flat blade screwdriver
taking care not to twist off poppet retainer. If torque wrench tools are
available, tighten to 25-30 in-lbs.
6. Inspect the assembled unit to insure the following:
• The poppet moves freely.
• The spring is fully guided on the poppet retainer.
• The spring end is 90° from the retainer’s screwdriver slot.
• The poppet retainer is shouldered against the sealing head.
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