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Copyright ©2011 XS Scuba
Service & Repair Manual
8. When the orifice has been unthreaded from the inlet
fitting, carefully insert a small wooden or plastic dowel
through the opposite end of the valve body, directly over
the sealing edge of the orifice. Gently press out the ori-
fice. (See Fig. 3.)
9. To avoid using a sharp tool that can damage the orifice,
squeeze the O-ring(24) between thumb and forefinger to
remove it from the orifice head. Discard the O-ring and
do not reuse.
10. Closely examine the orifice with the use of a magnifier,
checking for any scratches or other damage to the sealing
edge and the groove that holds the O-ring (see Fig. 4). If
any damage or wear is found, discard the orifice and do
not attempt to reuse. If it is in reusable condition, set it
aside on a soft surface to keep it isolated from other metal
parts.
11. While holding the second stage secure in one hand with
the purge facing up, firmly grasp the retaining ring(1) with
the other, and turn the ring counter-clockwise to loosen
and remove it.
NOTE:
If the retaining ring is difficult to loosen, XS
Scuba recommends using the Rim Clamp (P/N 20-
795-200), available from Peter Built Co. Complete
instructions are provided with the tool.
12. Lift off the diaphragm purge cover, and then gently pull
out the diaphragm(4) with the thrust washer(3). Closely
inspect these parts to ensure they are perfectly round and
free of any distortion, tears, or other damage. If any part
is found to be damaged, discard it and replace with new.
NOTE
: Do not attempt to disassemble the anti-friction
disc from the center of the diaphragm.
13. Through the inlet opening of the second stage housing,
gently press the lever support(17) with the complete valve
assembly into the second stage housing to remove.
14. Reassemble the inlet fitting with the lever support by hand
until finger snug, in order to hold the shaft of the pop-
pet(19) in place without turning, inside the keyed (square)
hole of the lever support.
15. While holding the assembly secure, apply a 4" nut driver
to turn the locknut(14) counterclockwise until it is com-
pletely unthreaded from the poppet (see Fig.
5).
Discard the locknut and do not reuse. Remove the spacer(15)
Fig. 5 – Disassembly of Valve Mechanism
Fig. 3 – Removal of Adjustable Orifice
Fig. 4 – Orifice Inspection
