Honeywell HON 512, User And Maintenance Manual

Page: 109 / 208

Maintenance
HON 512 with HON 650 pilot user manual 109
Figure Step Description
13 Lightly coat the thread surfaces with
threadlocker.
Screw the hex nut back onto the connect-
ing piece. Observe the tightening torque
information provided in the table before
this section.
14 Insert the connecting piece into the valve
body. Make sure that the holes (1,
2) are
aligned.
15 Align the valve body (1) as shown.
Hold the connecting piece (2) in position.
Insert the assembly aid, with the milled
surface (3) facing upward towards the
piston opening, into the valve body.
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