8
Impulse Second Stage Service & Repair Manual
© 1997 U.S. Divers Co., Inc.
breakage. If damage is found, discard the poppet and replace
with new before repeating steps 11-12.
14. Install the O-ring(22b) into the groove of the valve body that
is adjacent to the hexagonal feature.
15. Install the larger O-ring(31) into the groove in the base of the
shaft on the adjustment knob assembly(32), being careful to
avoid rolling the O-ring down over the threads. Install the
smaller O-ring(30) into the groove near the top of the shaft.
16. Place the anti-friction washer(29) over the nub of the adjust-
ment knob shaft, and carefully mate the adjustment knob shaft
into the large open end of the valve body. While maintaining
inward pressure against the poppet spring, turn the adjustment
knob clockwise to engage the threads. Check to ensure that
the lever rises immediately as the adjustment knob assembly is
mated into the valve body.
17. Continue turning the adjustment knob clockwise to the full
extent of its thread engagement until it stops, and then turn it
back out
1/2
turn counter-clockwise.
18. While holding the valve assembly horizontally so that the
lever faces down, insert the retaining pin(24) into the hole that
is adjacent to the O-ring. Ensure that the pin drops into place
inside the hole without protruding out, and screw the adjust-
ment knob completely in clockwise until it stops. This will
hold the pin securely in place to prevent it from falling out
while installing the valve module into the box bottom.
19. Lay the valve module assembly horizontally so that the adjust-
ment knob faces to the right and the lever is on its side, facing
furthest away. Closely examine the deflector clip(25) to locate
the dimpled feature which will mate into the hole that is facing
up in the center of the valve body barrel. Position the clip
over the hole so that the longer leg above the dimple faces
towards the lever, and the shorter leg faces away (see Fig. 15).
Press the clip into place so that the dimpled protrusion mates
into the hole, and inspect the outlet port on the opposite side
to ensure that it is open and unobstructed by the deflector clip.
CAUTION:
The deflector clip must be correctly installed to
ensure proper airflow and performance of the second stage
valve. If installed upside-down or on the opposite side of the
valve body, the deflector clip will obstruct the outlet port and
severely limit the flow of air from the second stage.
20. Orient the box bottom with the open face facing up. While
holding the lever depressed, pass the inlet end of the valve
module through the opening in the right side of the box bot-
tom until the lever can stand up freely inside.
CAUTION:
Be careful not to loosen the adjustment knob
while installing the valve module into the box bottom. It is
very important to keep the knob turned completely in clock-
wise, in order to hold the retaining pin in place.
Fig. 15 - Deflector Clip Alignment
Short Leg
