16.
Fig. 5
Item No. Description
1 Lower Housing
2 Upper Housing
3 Seat
4 Diaphragm
5 Facing Plate Assembly
6 Diaphragm Washer
7 Facing Plate Nut
8 Seat O-Ring
9 Bolt
10 Compression Spring
Maintenance – Model LP Dry Pilot Line Actuator
If water constantly flows through the Model LP Dry Pilot Actuator,
or if the actuator will not set up, the diaphragm/seal assembly may
need replaced.
1. Close the main valve controlling water supply to the system, and
close the air or nitrogen supply to the system.
2. Remove air or nitrogen pressure from the system.
3. Remove the actuator from the trim at the nearest convenient
points.
4. Remove six bolts holding the actuator halves together.
5. Clean and inspect all interior surfaces. Replace the diaphragm/
seal assembly.
6. Reassemble the actuator using a torque of 12 ft-lbs. on the six
bolts in a cross-tightening pattern.
7. Reinstall the actuator and set up the system following the section
“Resetting Model DDX Single Interlock Preaction Systems.”
Model LP Dry Pilot Line Actuator Parts List
P/N 71030010
Note: Parts list provided for information only. Available only
as an assembly; individual parts are not available.
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