Honeywell HON 5020 User And Maintenance Manual page 60

HON 5020 gas pressure regulator with HON 630 pilot
Figure Step Description
16 Replace the diaphragm and the stem seal
with new ones.
Install the diaphragm, including the stem
seal and the diaphragm plate, on the
connecting piece.
Make sure that the diaphragm is aligned
correctly: The side of the diaphragm that
has a depression at the center should be
facing upward.
17
Replace the piston with a new one. Insert
the new piston into the connecting piece.
Risk of confusion! Please observe the
characterizing difference between the old
and the new piston:
 Old piston (1):
Castellated nut closed
 New piston (2):
Castellated nut open
18
Lightly coat the thread surfaces with
threadlocker.
Put the cap in place.
Tighten the cap while using an open-end
wrench to hold the diaphragm plate in
place so as to prevent the components
from turning.
Observe the tightening torque information
provided in the table before this section.
19
Remove the assembly aid (2) from the
valve body.
Screw the assembly aid (2) into the new
valve insert (1).
20 Position the valve body (1) as shown.
Turn the valve insert (2) in such a way that
the dowel pin will engage the intended
hole on the valve body (1) and the nozzle
opening is pointing upwards.
Insert the valve insert (2) as far as it will go
into the connecting piece (1).
Maintenance
60