Section 8
High Pressure Water System
20425618
5-2005/Rev 0
8-18
Figure 8-10: High Pressure Discharge Check Valve
7. Apply a thin film of Pure Goop to the face of the seat opposite the poppet check valve and
install the seat into the sealing head. If the existing seat is reused, install the seat with the
new surface facing the poppet valve.
8. Install the poppet pin and the spring, with the larger end of the spring facing the poppet
valve, and then install the poppet valve into the gland nut.
9. Apply Pure Goop to the sealing face and the threads on the gland nut and thread the gland
nut into the sealing head. Hand tighten until there is a 0.20 inch (5 mm) gap between the
gland nut and the sealing head. No threads should show. If the gap exceeds 0.20 inch (5
mm), the poppet or seat has slipped out of position. The parts must be removed, inspected
and re-assembled.
10. Use a crowfoot/torque wrench combination and tighten the gland nut to the torque
specifications in Table 8-1.
Low Pressure Inlet Check Valve
The inlet check valves should be serviced on a regular, preventive maintenance schedule. Service
is recommended every 1,500 hours. 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.
1. Use a 1/2-inch flat blade screwdriver to remove the poppet retainer 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.
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