SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-16
05114624
7.3.3 Sealing Head
The sealing head should be inspected for scratches and wear on two surfaces:
• HP seal contact surface
• Inlet HP check valve poppet contact surface
In addition, the sealing head inlet water groove should be examined for
cracking.
1. Inspect the poppet sealing surface of the sealing head for pits, scratches, or
jetting erosion. If the sealing head is not absolutely smooth, it must be
refinished. Using a piece of plate glass (not window glass) on a sturdy table,
place a piece of 400 grit wet/dry sandpaper atop the plate of glass which
provides the absolutely flat surface necessary for the polishing process.
Using even, deliberate strokes, polish the sealing head until smooth. Rotate
the head about 10-15 degrees every stroke. Be careful not to tilt or tip the
head while polishing it as to not scrape the part.
2. When the sealing head is flat and smooth, perform a final polish with 600
grit wet/dry sandpaper. A mirror finish is required. Ingersoll-Rand offers a
refinishing service.
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