SANDPIPER RHDB2 Hazardous Duty - Manual (Page 26)

rhdb2dl1sm_haz duty-rev0614 Model RHDB2 Hazardous Duty Page 24
AirVantage Servicing -
Pilot Valve and Pressure Regulator
Pilot Valve and Pressure Regulator
To service the pilot valve or the pressure regulator, first shut off and bleed the air being supplied to the
pump. For safety purposes the air supply line should be disconnected from the pump. Then shut off the
suction and discharge lines to the pump. Bleed the pressure from the pump suction and discharge lines and
remove the lines from the pump. During the servicing of the AirVantage, consult the “AirVantage Composite
Repair Parts Drawing”.
Step #1: Remove the Patch Cable
• Twist the ribbed portion of the patch cable connector in a counterclockwise direction, until it unthreads
from the connector. The cable can be removed only from the intermediate.
Step #2: Remove the AirVantage from the Pump
• Use a ½” socket and remove the four 5/16-18 x 5 cap screws that hold the AirVantage to the pump. Be
sure to support the weight of the AirVantage while removing the last cap screw. After the AirVantage is
removed from the pump, set the unit down on the plastic cover located on the bottom. Inspect the o-ring
between the poppet valve and the adapter plate
for damage.
Step #3: Access the Pilot Valve and Pressure Regulator
• Use a 5mm hex-key wrench and remove four M6 x 35mm socket head cap screws & washers securing
the top cover on. Lift the cover off, exposing the pilot valve and pressure regulator. There is a molded
o-ring seal located on the underside of the cap. Make sure the o-ring stays located within the groove.
• If the pilot valve needs to be replaced, unplug the connector attached to it. Use a miniature 4-way
Phillips screwdriver and remove the two screws holding the pilot valve to the plate. The valve and
gasket can now be removed and/replaced. When reinstalling the pilot valve, tighten the screws to snug
with a miniature 4-way Phillips screwdriver.
• “AirVantage CAUTION” – Be sure to reattach the connector to the pilot valve.
• If the pressure regulator needs to be replaced, use slip-joint pliers to unscrew the regulator from the
body by turning it in a counterclockwise direction.
• “AirVantage CAUTION” – Do not loosen or tighten the regulator by turning the knurled portion
of the unit. Place the slip-joint pliers on the smooth area underneath the knurled area of the
regulator.
Step #4: Reinstallation
• Reinstall the top cover, making sure the o-ring seal is still in the groove. Tighten the four M6 screws.
• Reinstall the AirVantage using the four 5/16-18 x 5 cap screws and torque to 90 in-lbs.
• “AirVantage CAUTION” – Be sure to reattach the patch cable connector that connects the
AirVantage module to the intermediate.
Note: Ensure all mating faces are free from scores or damage prior to re-assembly.
Check each metallic face joint with a 0.003” feeler gage to ensure all flange
faces are fully closed after assembly. Failure to do so may compromise the
flameproof design of the assembly.
Note: Refer to Composite Repair Parts List on
page 12 for part numbers
Do not open when an
explosive atmosphere
may be present.
WARNING
COVER
REGULATOR
VALVE, SOLENOID
SEAL, O-RING
VALVE, POPPET
CAPSCREW, HEX SOC HD
M6 X 1.0 X 35
CAP, SWITCH
O-RING
Page 24
WASHER, FLAT, M6
Substitution of
components may
impair intrinsic safety.
WARNING