Apeks Regulator Service and Repair Manual
15
FINAL ADJUSTMENT AND TESTING PROCEDURES
Prior to adjusting and testing the Apeks second stage regulator, the
accompanying first stage must be correctly serviced, adjusted to a stable
intermediate pressure of 140 psi , and fully tested. Refer to the corre-
sponding first stage service procedures before attempting to perform
the adjustment and testing of the second stage.
1. Thread the male fitting of the IP hose into the preferred low pressure
Figure 15
port of the first stage, and apply a torque wrench with n" crow-foot
Venturi Lever "MIN" Setting
to tighten to 40 inch-pounds (±2).
2. Turn the second stage adjustment screw completely out counter-clock-
wise, and set the venturi lever to the "MIN" position (see Fig. X).
3. Connect the first stage to a filtered air source of 3,000 psi.
4. Turn the second stage adjustment screw exactly one full turn (360º)
clockwise.
5. Slowly open the air supply valve to fully pressurize the regulator.
a. If airflow can immediately be heard when the regulator is pres-
surized, depressurize and purge the system. Disconnect the IP
hose and remove the case cover, diaphragm cover, and diaphragm
to re-check the height of the lever. The lever should be set at a
height level with the rim of the case, with approximately 1.0 mm
freeplay (see Fig. 16). If the lever is set too low or too high,
Minimum free movement
Lever set correctly
apply a 5mm hex key through the inlet to adjust the crown seat
either counter-clockwise to raise or clockwise to lower the lever.
When the lever is set correctly, re-install the diaphragm, diaphragm
case rim
01.0 mm
cover, and case cover, and connect the IP hose to the second stage.
6. When no airflow can be heard after the regulator has been pressur-
ized, slowly depress the purge button to verify whether a strong air-
flow can be initiated when the button has traveled no more than 2mm.
Excessive free movement
If a strong purge cannot be initiated by depressing the purge
Lever set too low
NOTE button a maximum distance of 2mm, it will be necessary to
adjust the seat crown slightly counter-clockwise. Excessive
travel of the purge button indicates that the lever is set too low.
case rim
7. Depress the purge button sharply several times to ensure that leakage
or freeflow does not occur.
Zero free movement
Lever set too high
If a slight leak occurs after sharply purging the second stage, it
NOTE will be necessary to adjust the seat crown slightly clockwise,
being careful to adust only as far as needed to create a seal
between the seat crown and rubber seating, without raising the
case rim
lever too high.
8. Move the venturi lever to the "MAX" position and depress the purge
button sharply. This should initiate a strong, continuous freeflow that
Figure 16
can be eliminated by turning the venturi lever back to the "MIN"
Relationship between seat crown and
position.
lever height adjustment
