Section 9
High Pressure Water System
20412997
8-2012/Rev 12
9-18
Low Pressure Inlet Check Valve
The inlet check valve components differ, depending on the plunger diameter. See Figure 9-12,
Low Pressure Inlet Check Valve.
Figure 9-12: Low Pressure Inlet Check Valve
7/8” Plunger 1-1/8” Plunger
The inlet check valves should be serviced on a regular, preventive maintenance schedule. Service
is recommended every 1,000 hours for units with 7/8” diameter plungers and every 1,500 hours
for units with 1-1/8” diameter plungers. The hard seal end cap must be removed to service the
inlet check valve. Follow the procedure, Hard Seal End Cap Removal. When the end cap has
been removed, proceed with Step 1 below.
7/8” Diameter Plunger 1-1/8” Diameter Plunger
1. Use a 5/16-inch wrench or socket to
remove the poppet retainer screw.
Remove the retainer and the inlet poppet
from the sealing head.
1. Use a T20 star drive to remove the
poppet retainer screws. Remove the
retainer and the inlet poppet from the
sealing head.
2. Inspect the sealing head for scratches or
wear on the cone ring contact surface, and
on the inlet poppet valve contact surface.
If defects are detected, the surfaces must
be refinished. See the procedure, Sealing
Head Maintenance.
2. Inspect the sealing head for scratches or
wear on the cone ring contact surface,
and on the inlet poppet contact surface.
If defects are detected, the surfaces must
be refinished. See the procedure,
Sealing Head Maintenance.
3. Place the inlet poppet in the hole in the
poppet retainer as shown below. Position
the inlet poppet and retainer on the
sealing head, placing the dowel pin in the
appropriate hole in the sealing head.
3. Place the inlet poppet in the hole in the
poppet retainer as shown below.
Position the poppet retainer on the
sealing head.
Inlet Poppet Installation Inlet Poppet Installation
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