Honeywell HON 512, User And Maintenance Manual

Page: 121 / 208

Maintenance
HON 512 with HON 650 pilot user manual 121
Figure Step Description
33 Hold the valve body (2) in place and put
the diaphragm housing (1) back in place.
34 Replace the bonded seals (2) with new
ones.
Lubricate the thread surfaces.
Tighten the diaphragm housing’s screws
(1) in a criss-cross sequence. Observe the
tightening torque information provided in
the table before this section.
35 Replace the diaphragm (2) with a new one.
Put the diaphragm plate (3), the new
diaphragm (2), and the pressure piece (1)
back in place.
36 Tighten the hex nut (1) while using an
open-end wrench to hold the pressure
piece in place so as to prevent the com-
ponents from turning.
Observe the tightening torque information
provided in the table before this section.
37 Put the spring (1) back in place.