Dual Valve Assembly - Aqua Lung MDB Technical Manual

Airway Assembly
DuAL-VALVE
Assembly
1. Dip the dump valve poppet (19) into soapy water and press se-
curely onto the barbed tip of the poppet stem (20). Slide the spring
(21) onto the stem.
2. Insert the poppet stem (20) through the flat end of the poppet
guide (22).
3. Compress the poppet assembly with the forked end out onto
the poppet holding fixture. Using the inflator cord fixture, install the
braided nylon cord (24) through the hole in the poppet stem (20)
and round the inflator cord post 2 times (Two loops around post
and two passes through the stem). Tie a 2.5 cm (1 inch) loop on
one end of the cord using a "Overhand Bow Knot". Secure the cord
by going through the open loop with the opposite cord end and
tying three (3) "Half Hitches". Trim the excess cord to 1/4 inch at
both knots and seal the cord ends using a propane lighter (fixtures
can be locally manufactured).
CAUTION: Do not damage the knots with the flame.
Distance between posts
30.5 cm (12 inches)
Overhand Bow Knot
4. Position the poppet guide assembly so that the larger rib faces
toward the open side of the dual valve body (14), away from the
manifold. Lubricate the dump valve poppet with a small amount
of soapy water and align the arms of the poppet guide with the
grooves inside the barrel of the body. Insert the assembly into the
barrel only until the ears of the poppet guide rest above the rim.
(3) Half Hitches
Large Rib
25