SECTION 7
HIGH PRESSURE WATER
p. 7-20
80078868
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 Loctite 222 thread locker to thread of poppet retainer, taking
care not to get Loctite 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.
Figure 7-9 HP Check Valve Inlet Cutting Water
Item Description
(1) Sealing Head (2) Poppet (7) Spring (11) Poppet Retainer
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