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AVK 756 Series, Инструкция по эксплуатации и техническому обслуживанию

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OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION

AVK DOUBLE ECCENTRIC BUTTERFLY VALVES

SERIES 756

OPERATION & MAINTENANCE INSTRUCTIONS - ORIGINAL VERSION

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

• pressure rating PN 16:  4 m/s

• pressure rating PN 25:  5 m/s

3.4 PERMISSIBLE AND IMPERMISSIBLE MODES OF OPERATION

The pressure applied on the closed valve must not exceed the rated valve pressure.

The AVK double eccentric butterfly valve has adjustable mechanical limit stops on the gearbox to ensure a correct open 

and closed position. The stops have been set and sealed from factory to guarantee an optimum performance. 

Note: Broken stop seals may affect the warranty.

4. INSTALLATION IN THE PIPELINE

4.1 CONDITIONS REQUIRED ON SITE

When the valve is installed between two pipeline flanges, these must be completely aligned. If not aligned, it may result 

in impermissibly high loads stressing the valve body during operation which may eventually lead to fracture. 

When the valve is installed in a pipeline, make sure it is as tension-free as possible. The pipeline forces transmitted 

to the valve must not exceed the values specified in EN 1074-2. The gap between the flanges must be large enough 

to avoid damage of the coating on the raised flange face during installation. The pipeline flanges must not be drawn 

towards the valve during installation. 

If work around the valve may cause dirt (e.g. painting, masonry or work with concrete), the valve must be covered ade-

quately. Assembly in drinking water pipelines requires approved sealing materials, lubricants and process material for 

drinking water only. The pipeline sections must be thoroughly cleaned and purified before the valve is set into operation.

4.2 INSTALLATION LOCATION

The location of the valve on site must allow sufficient space for maintenance work. 

If the valve is installed in the open air, make sure it is protected against extreme weather conditions (e.g. formation of 

ice) by adequate covers. 

If the valve is installed as an end-of-line valve, make sure the free outlet side is not accessible for any kind of 

interference.

Page 5/13   

 

MI Butterfly756 rev. AC 2018

Содержание 756 Series

Страница 1: ...stallation location 5 4 2 1 Installations upstream and downstream of the valve 6 4 3 Installation position 6 4 4 Assembly instructions and fittings 6 5 Set up and valve operation 7 5 1 Visual inspection and preparation 7 5 2 Functional check and pressure test 7 6 Actuators 7 6 1 General 7 6 2 Operating torque 8 6 3 Assembly of the electric actuator 8 7 Maintenance and repair 8 7 1 General safety i...

Страница 2: ...nauthorised unintentional or unexpected actuation as well as any hazardous movement caused by stored energy pressurised air water under pressure must be prevented During monitoring or inspection of equipment all relevant laws and regulations must be complied with the Industrial Code the Accident Prevention Regulations the Ordinance of Steam Boilers and instruction pamphlets issued by the Pressure ...

Страница 3: ...port must be specially protected The valve must be placed on one of its flanges or alternatively on the flange flat base during transport Make sure that the valve is placed in horizontal position during the entire lifting procedure The general regulations relating to use of lifting devices must be met at all times Transport position on flange Transport position on flat base Lifting eyes of valves ...

Страница 4: ... 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 va...

Страница 5: ...ody during operation which may eventually lead to fracture When the valve is installed in a pipeline make sure it is as tension free as possible The pipeline forces transmitted to the valve must not exceed the values specified in EN 1074 2 The gap between the flanges must be large enough to avoid damage of the coating on the raised flange face during installation The pipeline flanges must not be d...

Страница 6: ... during transport or storage Protect the valve from any kind of dirt on the construction site by using an adequate cover until installation All components like seat and sealing ring on the disc must be thoroughly cleaned before installation in order to remove all dirt particles AVK does not assume any liability for consequential damage caused by dirt shot blasting gravel residues etc If any equipm...

Страница 7: ...in process the valve must be adequately covered to protect it from dirt 5 SET UP AND VALVE OPERATION 5 1 VISUAL INSPECTION AND PREPARATION A visual inspection of all functional parts must be performed before valve and equipment are put into operation Check if all bolted connections have been properly fastened 5 2 FUNCTIONAL CHECK AND PRESSURE TEST Prior to operation the functional parts of the val...

Страница 8: ...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 m...

Страница 9: ...out by qualified personnel only The plant operator is responsible for selecting qualified personnel to carry out any of this work 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 ope...

Страница 10: ... operating conditions 7 3 3 CLEANING AND LUBRICATION Remember to grease the disc seal and O rings slightly during replacement Only use lubricants approved for drinking water applications according to local legislation 7 3 4 REPLACEMENT OF THE DISC SEAL The disc seal can be replaced without disassembly of the disc Disassembly of the disc seal only with fixed disc on gearbox Open the disc in fully o...

Страница 11: ...aintenance work Turn the disc 12 in closed position Detach the hexagonal nuts at the gear flange and pull off the gear Replacement of O ring step 1 Loosen the hexagonal bolts on the seal housing and then use two bolts to pull it out Replacement of O ring step 2 Replace the O rings and grease them slightly with a drinking water approved lubricant 1 2 3 4 5 11 7 8 9 10 11 14 13 12 15 16 17 18 6 ...

Страница 12: ... 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 Fasten the gear fixing screws We recommend application of torques in 4 x thread size e g M12 48 Nm Check of position indicator step 4 Mounting the gearbox step 5 ...

Страница 13: ...IGINAL 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 Bolt torques M6 M8 M10 M12 10 Nm 32 NM 40 Nm 50 Nm ...

Страница 14: ... 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 Check the O ring and get it mounted securely using drinking water approved grease Mount a new seat ring in the body Remount the disc assembly onto the body ...

Страница 15: ... jammed in the seat area Flush valve dismantle if necessary and remove foreign matter Gear blocked Undo blocking No electrical connection of the electric actua tor Establish the electrical connection Unfavourable flow and impairment of move ment Change installation position Leaks in the body seat The valve is not completely closed Close the valve completely Valve seat is damaged or worn Replace se...

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