8 Servicing/Maintenance
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BOA-Control/ BOA‑Control IMS
The service life can be extended by taking the following measures:
▪
Checking the function by opening and closing the valve at least once or twice a
year
▪
Lubricating the moving parts such as stem 200 and stem nut 925 using
standardised lubricants to DIN 51825.
▪
Re-tightening or replacing the bonnet/cover gasket 411 in good time.
8.2.1 (Re-)tightening the bonnet/cover bolting
Replacing bonnets or bonnet gaskets is possible and permitted on BOA-Control IMS
nominal valve sizes 250 to 350.
After maintenance or repair work has been completed, all bolting in the bonnet/
cover area must be re-tightened so as to restore full functionality of the valve.
WARNING
Failure to test overhauled valves
Hazard to persons and the environment!
▷
After reassembly and prior to commissioning/start-up, the valves must be
subjected to shell and leak testing to DIN EN 12266-1.
NOTE
Do not apply additional sealing agents to asbestos-free gaskets. In the case of
valves with anti-adhesive coatings, only use agents explicitly recommended by the
sealing element manufacturer.
8.2.2 (Re-)tightening the back-up gland packing
BOA-Control IMS valves of nominal sizes 250 to 350 are delivered with the back-up
gland packing not tightened to its full sealing performance.
DANGER
Bellows failure
Leakage of hot and/or toxic fluids!
Risk of burns!
▷
Tighten the stuffing box screws (45-6) until no leakage can be seen.
45-6
461
Fig. 5:
Sectional drawing of
BOA-Control IMS DN
250-350
Table 14:
Stuffing box screws to DIN 913
DN
Thread
Hexagon socket
250-350
M 16
WAF 8
The valve should be replaced as quickly as possible to ensure proper functioning!
8.2.3 Removing the actuator
DANGER
Removing/dismantling actuators
Risk of injury!
▷
Observe the actuator’s operating manual.
8.2.4 Valve reassembly
Valve reassembly must be effected in reverse order to dismantling.
