Section 8
High Pressure Water System
20425618
5-2005/Rev 0
8-19
Figure 8-11: Low Pressure Inlet Check Valve
3. Inspect both faces on the inlet poppet valve. The poppet valve can be installed with either
face toward the sealing head. If one face is worn, but the opposite is not, the poppet can
be reversed, placing the best surface toward the sealing head. If both faces are worn, the
poppet valve must be replaced.
4. Assemble the spring and the inlet poppet valve on the poppet retainer. Apply a small
amount of Loctite 222 to the poppet retainer threads only. Do not get any Loctite on the
poppet or any other surfaces on the inlet check valve.
5. Use the flat blade screwdriver to tighten the poppet retainer. Tighten the poppet retainer
to the torque specifications in Table 8-1.
6. Inspect the assembled unit to ensure:
• The poppet moves freely
• The spring is fully guided on the poppet retainer
• The spring end is 90 degrees from the screwdriver slot on the retainer
• The poppet retainer is seated against the sealing head
Sealing Head Maintenance
The sealing head should be inspected for scratches, excessive sealing damage or erosion marking
on the cone ring contact surface, and on the inlet poppet valve contact surface. If defects are
detected, the surfaces must be refinished. The sealing head can be returned to KMT Waterjet for
refinishing.
1. Clean the 45-degree surface on the cone ring with 600-grit wet/dry sandpaper, using a
radial motion. It will not be possible to fully remove the main sealing marks.
2. Inspect the inlet poppet valve sealing surface for pits, scratches or jetting erosion. If
necessary, refinish the surface.
Place a piece of 1/4-1/2” thick plate glass, not window glass, on a sturdy table to provide
an absolutely flat surface. Place a piece of 400-grit wet/dry sandpaper on the glass. Use
even, deliberate strokes, rotating the sealing head approximately 10-15 degrees after each
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