Apeks DST Service Manual

DST First Stage Technical Maintenance Manual
13
2
Install a new hydrostatic
diaphragm (25) into the
environmental end cap (26).
3
Thread the end cap (26) clockwise onto the dry chamber until
hand tight.
5
With the end cap in place,
recheck the MP to conrm
there has been no change.
6
Close the cylinder valve and
depressurize the regulator.
Remove the test gauge.
THIS CONCLUDES ASSEMBLY OF THE
DST FIRST STAGE
FINAL TESTING
1
Using an in-lb torque wrench with a 9/16” crow-foot, torque the
MP hose to 40 in-lbs (4.5 Nm) to the rst stage. Install a properly
adjusted second stage to the female end of the MP hose. Connect
the rst stage to a cylinder lled to approximately 3000 psi (206
bar). Slowly open the cylinder valve to pressurize the regulator and
submerge the entire system in a test tank of clean fresh water.
External Leak Test
2
Observe any bubbles arising from the submerged regulator over
a one minute period. The recommended time is necessary due
to slower bubble formation that
occurs in smaller leaks. Bubbles
indicate a leak, this would require
the system to be disassembled
at the source to check sealing
surfaces, assembly sequence and
component positioning in order
to correct the problem(s). If any
bubbles are visible, refer to Table 1:
Troubleshooting Guide, p. 14
3
If there are no leaks, close the cylinder valve and depressurize
the regulator. Remove the rst stage from the cylinder valve and
secure the dust cap in place.
THIS CONCLUDES SERVICING OF THE
DST FIRST STAGE
NOTE: Do not confuse bubbles from trapped air with a true leak.
If there is an air leak, bubbles will come out in a constant stream.
4
Using the pin spanner (pn
AT30), tighten the end cap
until snug.

Apeks DST Specifications

General

Brand	Apeks
Model	DST
Category	Controller
Language	English