OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION
AVK DOUBLE ECCENTRIC BUTTERFLY VALVES
SERIES 756
Page 8/13
MI Butterfly756 rev. AC 2018
For detailed information on gears and actuators, please see the operation manuals issued by the manufacturer of these
components.
The AVK double eccentric butterfly valve has an adjustment angle of 90°. The valve itself is not equipped with position
limiters.
6.2 OPERATING TORQUE
Operating torques are the maximum required torques (in Nm) acting on the gearbox input shaft at full differential
pressure.
Set points for the actuators are stated in the AVK document “How to order”.
6.3 ASSEMBLY OF THE ELECTRIC ACTUATOR
The electric actuator is mounted on the input flange on the gear unit.
For further information, please contact the actuator manufacturer.
7. MAINTENANCE AND REPAIR
7.1 GENERAL SAFETY INSTRUCTIONS
These instructions must be followed prior to inspection and/or maintenance work on the valve or its assemblies:
• Shut off the pressurised pipeline and depressurise it.
• Secure it against inadvertent activation.
• Comply with all required safety regulations - depending on the type and risk of the fluid conveyed.
When the inspection/maintenance work is completed, all connections must be checked for tightness before resuming
operation. Perform the steps described for initial set-up according to section 5, ”Set-up and valve operation”.
Do not remove the gearbox on a pressurised valve!
If removal of the gearbox is necessary, a self-locking device fixing the disc in open position is available upon request for
dimensions from DN 150 and up.
Please contact the AVK logistics department for further information on this subject.
Do not use it as blocking device in closed position.
The self-locking device must be mounted as follows:
• Loosen the bolts and remove the end plate on the non-drive shaft side.
