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MI Butterfly756 rev. AC 2018
2.2 STORAGE
During storage, the AVK double eccentric butterfly valve disc must be kept slightly open in order not to compress the
disc seal.
The elastomeric parts (seals) must be completely protected against direct sunlight and/or UV light in order to secure the
long-term sealing function. The valve must be stored in a clean and dry environment and avoid direct heat. Protect all
assembly units with an adequate cover to prevent dust and dirt on the disc and body.
The valve must be stored at a temperature between -20°C and +50°C (protected by an adequate cover). If the valve
is stored at temperatures below 0°C, it must be warmed up to at least +5°C before installation and before put into
operation.
Storage of the double eccentric butterfly valve
3. PRODUCT FEATURES
3.1 FEATURES AND FUNCTION
The AVK double eccentric butterfly valve is applicable for in-line or end-of-line installations.
Due to its double offset design principle, the profile seal ring is completely unstressed when the valve is in slightly open
position. If required, the profile seal ring can be disassembled without dismantling the valve.
3.2 APPLICATIONS
It is recommended that the AVK double eccentric butterfly valve are used only in media with no risk of clogging.
The butterfly valve is suitable for the following media:
• drinking water and other neutral liquids
• raw and cooling water (with appropriate corrosion protection)
3.3 PERFORMANCE
3.3.1 CAVITATION
AVK double eccentric butterfly valves are designed for on/off duty. In non-closed position the maximum flow velocity,
local pressures and the cavitation limits must be observed.
If cavitation occur, we recommend:
• rise the back pressure, and/or
• change the place of installation
OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION
AVK DOUBLE ECCENTRIC BUTTERFLY VALVES
SERIES 756
