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OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION
AVK DOUBLE ECCENTRIC BUTTERFLY VALVES
SERIES 756
TABLE OF CONTENTS
COPYRIGHT©AVK GROUP A/S 2018 - AVK INTERNATIONAL A/S, BIZONVEJ 1, DK-8464 GALTEN - WWW.AVKVALVES.EU
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MI Butterfly756 rev. AC 2018
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Table of Contents
Related Manuals for AVK 756 Series
Summary of Contents for AVK 756 Series
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Page 1: Table Of Contents
7.3.6. Tightening of seal retaining ring 7.3.7. Replacement of the seat ring in the body 8. Trouble shooting 9. How to contact us COPYRIGHT©AVK GROUP A/S 2018 - AVK INTERNATIONAL A/S, BIZONVEJ 1, DK-8464 GALTEN - WWW.AVKVALVES.EU MI Butterfly756 rev. AC 2018... -
Page 2: General
These operations and maintenance instructions must be observed and applied at all times. Arbitrary alterations of this product and any appertaining parts are not allowed. AVK will not assume any liability for the consequent damage due to non-compliance with these instructions. -
Page 3: Transport And Storage
OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION AVK DOUBLE ECCENTRIC BUTTERFLY VALVES SERIES 756 2. TRANSPORT AND STORAGE 2.1 TRANSPORT During transport to the installation site, the valve must be packed in a safe and stable packing material suitable for the specific valve size. -
Page 4: Storage
SERIES 756 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. -
Page 5: Maximum Permissible Flow Velocity
AVK DOUBLE ECCENTRIC BUTTERFLY VALVES SERIES 756 3.3.2 MAXIMUM PERMISSIBLE FLOW VELOCITY According to EN593, AVK series 756 butterfly valves are designed for the following velocities fully open in liquid media: • pressure rating PN 6: 2.5 m/s • pressure rating PN 10: 3 m/s •... -
Page 6: Installations Upstream And Downstream Of The Valve
4.3 INSTALLATION POSITION AVK double eccentric butterfly valves in all nominal widths can be installed with shafts in horizontal position (with gear facing upwards or downwards). A vertical position of the valve shaft is possible but it may affect the service life of the valve (number of operating cycles). -
Page 7: Set-Up And Valve Operation
Prior to operation, the functional parts of the valve must be opened and closed completely at least once to ensure a trouble-free operation. Warning: It is not allowed to operate the AVK double eccentric butterfly valve in a dry state more than once due to the risk of damaging the disc seals and/or increasing the torques. -
Page 8: Operating Torque
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. -
Page 9: Inspection And Operation Intervals
If the plant operator does not have personnel with the qualifications required, a training course must be initiated. Upon request, such training course can be held by AVK service employees. The plant operator must ensure that all employees concerned fully understand the operation and maintenance instructions as well as all further instructions referred to here. -
Page 10: Maintenance Work And Replacement Of Parts
7.3 MAINTENANCE WORK AND REPLACEMENT OF PARTS 7.3.1 DESIGN The below figure serves as a partial overview of the description for the below working steps. For information about spare parts and their parts number, please contact AVK. 1. Bolt 2. End plate 3. - Page 11 OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION AVK DOUBLE ECCENTRIC BUTTERFLY VALVES SERIES 756 The valve must be depressurised during this kind of maintenance work: 14 13 12 • Turn the disc (12) in closed position. • Detach the hexagonal nuts at the gear flange and pull off the gear.
- Page 12 OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION AVK DOUBLE ECCENTRIC BUTTERFLY VALVES SERIES 756 Mounting and greasing of O-rings – step 3 • Reassemble the seal housing • Make sure that the disc position and gear position indicator match each other before mounting the gear.
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Page 13: Tightening Of Seal Retaining Ring
OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION AVK DOUBLE ECCENTRIC BUTTERFLY VALVES SERIES 756 • Reassemble in reverse order For other bolt dimensions, we recommend application of torques in 4 x thread size, e.g. M12 = 48 Nm. 7.3.6 TIGHTENING OF SEAL RETAINING RING... -
Page 14: Replacement Of The Seat Ring In The Body
OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION AVK DOUBLE ECCENTRIC BUTTERFLY VALVES SERIES 756 7.3.7 REPLACEMENT OF THE SEAT RING IN THE BODY DN 150-600 DN 700-2800 • Dismount the disc assembly from the body. • Dismount the seat ring from the body. -
Page 15: Trouble Shooting
The valve is dry in pipeline, no medium present. The valve is operated more easily when it is wet. 9. HOW TO CONTACT US You can find your local AVK partner on www.avkvalves.com. Page 13/13 MI Butterfly756 rev. AC 2018...
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