QmB Series IP40, IP65, IP65XP
Section 4 Maintenance
4-8
Installation and Operation Manual
X-CM-QmB-eng
Part Number: 541B029AHG
June, 2008
Assembly
1.
Examine all parts for signs of ware or damage, replace as necessary.
Refer to the parts list Figure 4-3.
2.
Install the metal seal, item (2) in the center of the valve body, item (1).
3.
Install the orifice, item (3) in the valve body, item (1).
The lower protrusion on the orifice must center in the orifice
seat!
The seal must be new and un-used.
4.
Install the valve seat, item (5) in the valve cavityon top of the orifice.
5.
Install o-ring, item (3) in the valve body, item (1). it is recommended
that a new o-ring be used. Refer to parts list in Figure 4-3. When
ordering the o-ring specify the correct compound i.e. Viton, Kalrez
etc. depending upon your specific process.
6.
Install the vavle stem, item(6) over the valve seat, item (5) and center
of the valve body, item (1).
7.
Install the four valve screws, item (7) until they make light contact
with the base of the valve stem, item (6). Torque the valve screws in
a diagonal pattern in three increments slowly rising to a final torque
value of 175 inch-pounds (20 N-m). Refer to Figure 4-4.
8.
Install the valve coil, item (8).
9.
Install the valve cover, item (9).
10. Install the vavle nut, item(10) hand tight (snug).
11. Pressure and leak test to local standards.
Note:
Standard Brooks Instrument pressure test is 1.5 times the design
pressure marked on the valve and a helium leak test at 1 x10
-9
bar .cc/s
helium maximum.
Note:
The above leak test only evaluates the outbound
seals. The inbound seal should be also evaluated. This can be
accomplished while the unit is on the bench or when returned to normal
service.
Figure 4-3 Parts List
