4
PRX Series
e. Lock the stem (key 23) by inserting a key into the notches
and unscrew nuts (key 20 and 26).
f. Disassemble the parts and replace the diaphragm
(key 14) and the pad (key 22).
g.
Unscrew the seat (key 19) and replace the O-ring (key 17).
h. Use petrol to cleanse the pilot body and all metal parts. Blow
them thoroughly with compressed air and check for clear
holes along the gas conduits. Replace any worn parts.
Reassembly
Reassemble all parts by following in reverse order the assembly
as described above (see General Maintenance section).
As parts are assembled, make sure they move freely
causing no friction.
Make sure to:
a. O-rings and diaphragms should be lubricated by applying a
thin layer of ‘Molykote 55 M’ grease.
Pay attention not to damage them during reassembly. All
other pilot parts require no lubrication.
b. The cover clamping screws (key 10) should be tightened
evenly to ensure proper tightness.
c. Pilot operation, calibration and tightness should be tested as
described in the Gas-tightness test section.
d. Previously disassembled ttings must be connected. Check
for leaks by using suds.
SPARE PARTS
Spare parts storage shall be done by proper procedures
according to national standard/rules to avoid over aging of
rubber parts or any damage to critical parts.
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