Honeywell HON 5020 User And Maintenance Manual page 77

HON 5020 gas pressure regulator with HON 630 pilot
Figure Step Description
21 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.
22
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
23
Take the upper connecting piece.
Replace the O-ring (1) with a new, greased
O-ring.
24
Lightly coat the thread surfaces with
threadlocker.
Screw the connecting piece (1) back in
place while using an open-end wrench to
hold the diaphragm plate (2) in place so as
to prevent the components from turning.
Observe the tightening torque information
provided in the table before this section.
25 Remove the assembly aid (2) from the
valve body.
Screw the assembly aid (2) into the new
valve insert (1).
Maintenance
77