VAG Operation and Maintenance Instructions • 12
connection bolts of the gear and the electric actuator are sealed
with labels and/or identified by colour markings. The removal or
breaking of these identifications will result in the loss of the manu-
facturer’s warranty.
7 Maintenance and repair
7.1 General safety instructions
Prior to the performance of inspection and maintenance work on
the valve or its assemblies, shut-off the pressurised pipeline, de-
pressurise it and secure it against inadvertent activation. Depend-
ing on the type and hazardousness of the fluid conveyed, comply
with all required safety regulations!
After completing the maintenance works and before resuming
operation, check all connections for tightness. Perform the steps
described for initial set-up as described under Section 5 “Set-up
and operation”.
Figure 12: Markings on the gear unit
A VAG CEREX
®
300 Butterfly Valve is not self-locking. The ac-
tuator/the gear must not be disassembled as long as the valve is
pressurised. This also applies in case the complete valve is dis-
mantled.
Statutory and local provisions as well as the safety and accident
prevention regulations must be observed and complied with at all
times.
Couplings and connections must never be disassembled when
they are under pressure.
Servicing, maintenance and inspection work as well as the re-
placement of spare parts must be carried out by qualified per-
sonnel. The plant operator is responsible for determining the suit-
ability of the personnel or for ensuring that they have all relevant
qualifications.
In case the operator’s employees do not have the qualifications
required, they should attend a training course. Valve related train-
ing courses can be undertaken by VAG Service employees.
In addition to this, the plant operator needs to ensure that all em-
ployees have understood these Operation and Maintenance In-
