Honeywell HON 5020 User And Maintenance Manual page 68

HON 5020 gas pressure regulator with HON 630 pilot
Figure Step Description
19 Replace the diaphragm (2) and the stem
seal with new ones.
Install the diaphragm, including the stem
seal and the diaphragm plate (1), 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.
20 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
21 Lightly coat the thread surfaces with
threadlocker.
Put the cap (1) in place.
Tighten the cap (1) 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.
22 Remove the assembly aid (2) from the
valve body.
Screw the assembly aid (2) into the new
valve insert (1).
23 Align the valve body as shown in figure 24.
Turn the valve insert in such a way that, as
shown in the sectional view, the dowel pin
(3) is coaxially aligned with the lower hole
(1) and the nozzle opening (2) is facing
upward.
Maintenance
68