Honeywell HON 5020 User And Maintenance Manual page 72

HON 5020 gas pressure regulator with HON 640a / HON 642a pilot
Figure Step Description
11 Loosen the screws (1) and lift off the upper
cover (2).
12 Remove the valve body by lifting it off.
13 Unscrew the nut (1) while using an
open-end wrench to hold the diaphragm
plate (2) in place so as to prevent the
components from turning.
Remove the diaphragm plate (2) and the
diaphragm (3).
14 Flip the valve body over.
Unscrew 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.
15
Replace the O-ring with a new, greased
O-ring.
Maintenance
72