Brooks Instrument QMBM - Manual (Page 47)

Section 4 Maintenance
4-7
Installation and Operation Manual
X-CM-QmB-eng
Part Number: 541B029AAG
June, 2011
QmB Series IP40, IP66, IP66XP
4-3 External Valve Service
Valve Disassembly
The numbers in () refer to the parts in the exploded view diagram
Figure 4-2.
1. Remove valve nut, item (9).
2. Remove coil cover and coil, item (8).
3. Remove the four valve stem screws, item (7). Discard and replace
with new fasteners. Do not re-use these components!
4. Carefully remove the valve stem, item (6). The valve seat, item (5)
may be stuck in the stem, use care not to drop this part. Small
tweezers can be used to remove item (5) if stuck in stem recess.
5. Remove stem seal O-ring, item (3) from the valve body, item (1).
It is recommended that the seal be discarded and replaced with a
new un-used part.
6. Remove the orifice, item (4). Care must be taken to prevent damage
to the coplanar top side surface and the lower sealing surface!
7. Remove the lower metal seal, item (2). This part will most likely be
found on the bottom of the orifice, item (4) or in the bottom of the
valve body, item (1). Discard this seal as it is a one time use only!
This metal seal must be replaced with a new part or damage to the
valve body and/or the orifice can result.
8. Examine the valve body, item (1) and clean if necessary.
Clean all parts prior to inspection and re-assembly using a solvent and soft
brush or clean in an ultrasonic cleaner. Care must be taken not to damage
any of the valve sealing surfaces.