The electric actuator is mounted to the input flange of the gear
unit. The actuator size is selected according to the maximum ope-
rating torques.
The valve is switched off:
• position-dependent in Open position
• position-dependent in Closed position
The switch settings are factory-adjusted. The torque switches
serve as overload protection in the intermediate positions. If the
valve is retrofitted with an electric actuator, the position switches
have to be adjusted after the actuator has been mounted. For the
adjustment procedure, please refer to the operating manual issu-
ed by the manufacturer of the electric actuator.
The relevant safety regulations of the VDI / VDE and the instruc-
tions of the manufacturer of the electric actuator must be obser-
ved.
When the items are delivered, the adjustment screws and the
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
manufacturer’s warranty.
6.5 Valves with VAG HYsec hydraulic
brake-and-lift units
To butterfly valves equipped with a VAG HYsec hydraulic brake-
and-lift unit, the order-related operating instructions apply in each
case (see KAT-B-5512).
Picture 15: VAG EKN
®
Butterfly Valve with VAG HYsec hydraulic brake-and-lift
unit
7.1 General safety instructions
Prior to the performance of inspection and mainte-
nance work on the valve or its assemblies, shut-off
the pressurised pipeline, depressurise it and secure it
against inadvertent activation. Depending on the type
and risk 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”.
A VAG EKN
®
Butterfly Valve not equipped with a gear unit is not
self-locking. The actuator/the gear unit may not be disassembled
as long as the valve is pressurised. This also applies in case the
valve is completely dismantled.
Statutory and local provisions as well as the safety and accident
prevention regulations must be observed and complied with at all
times.
Damage due to current intensity and current flow must be pre-
vented.
Couplings and connections must never be disassembled when
they are under pressure.
Servicing, maintenance and inspection work as well as the repla-
cement of spare parts must only be done qualified staff. The plant
operator is responsible for determining the suitability of the staff
or for ensuring the relevant qualifications.
VAG Operation and Maintenance Instructions • 14
7 Maintenance and repair
6.4 Assembly of the electric actuator
