Flow ESL INTENSIFIER Manual page 25

Lapping the inlet poppet and main body
Machining allowances
If the sealing surface of any component cannot easily
be restored by lapping, you can machine it flat before
lapping as long as: only the sealing surface is machined,
the relationship of the face to the component axis is
unchanged, and minimum dimensions are maintained
(see below).
Minimum dimensions
Inlet poppet face:
Minimun height of 0.365 in. (9.27mm) on the
•
shoulder and radius of 0.035 in. (0.9 mm)
Inlet poppet:
Minimum thickness of 0.115 in. (3.05 mm)
•
© Flow International Corporation
Lapping the inlet poppet
The inlet poppet can be lapped by hand.
1. Lap the poppet on the wetted 320 grit side of the
plate in a figure-8 pattern until all surface imperfec-
tions have been removed.
2. Turn the plate over and lap on the 600 grit side until
the poppet is evenly polished.
3. Using the wetted 320 grit side of the plate, draw the
body along the full length of the abrasive strip once,
then rotate it 90° and repeat the score.
This final scoring process will help avoid poppet sticking.
Lapping the check valve main body
Because of its size, the main body can be lapped by
hand, keeping any rounding of the sealing face outside
the area where the inlet poppet sits.
1. Lap the body on the wetted 320 grit side of the
plate in a figure-8 pattern until all surface imperfec-
tions have been removed.
2. Turn the plate over and lap on the 600 grit side until
the body is evenly polished.
3. Using the wetted 320 grit side of the plate, draw the
body along the full length of the abrasive strip once,
then rotate it 90° and repeat the score.
This final scoring process will help avoid poppet sticking.
ESL Intensifier
M-310 | 25