Impulse Second Stage Service & Repair Manual
7
© 1997 U.S. Divers Co., Inc.
CAUTION:
Do not use a tool to install the exhaust tee.
Doing so may cause serious damage to the seating flange,
requiring replacement of the box bottom.
7.
Lay the valve body(23) lengthwise with the positioning mark
facing up as shown in Figure 11. Gently flex the arms of the
lever(26) evenly apart while fitting them over the positioning
mark and onto the valve body, until they are seated inside their
respective square holes. Closely examine the shape of the
lever to ensure that it has not become bent during installation.
8.
Install the O-ring(20) onto the crown(21), and carefully insert
the threaded end of the crown into the inlet end of the valve
body. Gently press it in further with the blunt end of the seat
extraction Tool (P/N 1094-36) until it stops (see Fig. 12).
9.
Apply a medium blade screwdriver to the slotted head of the
adjustable crown, and turn the crown clockwise to engage the
threads. Continue turning the crown clockwise to the full
extent of its thread engagement, and stop turning when resis-
tance is felt. Then turn the crown out counterclockwise
exactly
2 1/2
turns to arrive at its correct preliminary setting.
10. Closely inspect the poppet/ LP seat assembly(27) to ensure
that the low pressure seat is seated securely inside the head of
the poppet, and that no foreign matter, indentations, or scars
are visible. Fit the spring(28) over the stem of the poppet
assembly, so that it is seated securely at the base.
11. Stand the valve body vertically with the male threaded inlet
end facing down, and positioned so that the lever faces di-
rectly to the left, resting perpendicular to the valve body.
While holding the poppet assembly by the spring, align the
poppet above the top of the valve body so that the two retain-
ing ears which engage the arms of the lever are facing directly
to the right; opposite of the lever (see Fig. 13).
12. Lower the poppet assembly and spring straight down inside
the barrel of the valve body without disturbing this alignment,
so that the poppet assembly is resting directly over the arms of
the lever. Gently spread both arms of the lever evenly outward
to allow the poppet assembly to drop into place, and relax the
lever arms (see Fig. 14).
WARNING:
DO NOT attempt to press the poppet forcefully
into the barrel of the valve body, past the arms of the lever.
Doing so may damage the poppet and impair its correct
engagement with the lever. If left undetected, this damage
could lead to serious injury or death.
13. Turn the valve body over to ensure that the poppet does not
fall out, and test the movement of the lever to the ensure that it
swings freely as the valve body is turned over in each direc-
tion, without any interference. If the poppet assembly falls
out of the valve body, or if the lever does not swing freely
back and forth, remove the poppet and closely inspect the
retaining ears for any signs of damage, such as cracking or
Fig. 12 - Crown Installation
Fig. 14 - Poppet & Lever Engagement
Fig. 13 - Poppet & Lever Alignment
"Ears"
