Honeywell HON 673 - Page 51

Maintenance
HON 380 gas pressure regulator with HON 673/674 controller 51
Figure Step Description
17 Take the valve spindle including at-
tached parts out of the intermediate
piece.
18 Unscrew the nut (1) and take out the
following parts:
 Pressure disc (2)
 Compensating diaphragm (3)
Check the compensating diaphragm
for damage. Replace it if necessary.
19 IMPORTANT! Pull out the quad ring
(1) upwards so as to avoid damaging
the sliding surface of the intermedi-
ate piece.
Replace the quad ring (1) with a new,
greased quad ring.
20 Turn the intermediate piece and re-
lease the locking ring (1) to remove
the plain bearing (2).
Check the plain bearing for damage.
Replace it if necessary.
Replace the O-ring (3) with a new, lu-
bricated O-ring.
Proceed in the reverse order as for the disassembly in “Performing maintenance
on the regulator unit”. See above.
Depending on what you want to do next, proceed as indicated in the relevant sec-
tion:
 Installing the regulator unit (see page 61)
 Completing the maintenance (see page 63)
Assembling the regu-
lator unit
Next task