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AVK 641 Series, Field Maintenance And Instruction Manual

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AVK GROUP A/S
An ISO 9001-2000 registered company

Maintenance Manual Series 641
*Subject to change without notice. (rev. 13/01 A)

AVK SERIES 641 SWING CHECK VALVE

FIELD MAINTENANCE AND INSTRUCTION 

MANUAL DN700 - DN1000

TABLE OF CONTENTS

EXPLODED ASSEMBLY / PARTS LIST
INTRODUCTION / DESCRIPTION
HEALTH AND SAFETY AT WORK
SPARE PARTS
DESIGN CONSTRAINTS 
STORAGE AND HANDLING
INSTALLATION
-

SWING

-

LEVER AND WEIGHT

-

LEVER, WEIGHT AND GUARD 

MAINTENANCE
TROUBLESHOOTING
DISASSEMBLY FOR INSPECTION 
RE-ASSEMBLY AFTER INSPECTION

                  A

VK  GROUP A/S

-

FREE SHAFT WITH COVER

-

PROXIMITY SWITCH

Summary of Contents for 641 Series

Page 1: ...D INSTRUCTION MANUAL DN700 DN1000 TABLE OF CONTENTS EXPLODED ASSEMBLY PARTS LIST INTRODUCTION DESCRIPTION HEALTH AND SAFETY AT WORK SPARE PARTS DESIGN CONSTRAINTS STORAGE AND HANDLING INSTALLATION SWING LEVER AND WEIGHT LEVER WEIGHT AND GUARD MAINTENANCE TROUBLESHOOTING DISASSEMBLY FOR INSPECTION RE ASSEMBLY AFTER INSPECTION AVK GROUP A S FREE SHAFT WITH COVER PROXIMITY SWITCH ...

Page 2: ...page 1 AVK Series 641 Swingcheck Valve Exploded Parts Breakdown DN700 DN1000 18 20 21 26 25 28 27 24 22 23 19 33 34 35 32 31 29 30 17 15 16 7 8 9 10 11 12 5 6 4 3 2 1 13 14 ...

Page 3: ...A276 316 20 O Cord EPDM 70 Shore A 21 Collar Large PA 6 6 Polyamid Ultramid A3K Naturel 22 Bush on body big hole Al Bronze BS EN12163 CW307G 23 Grade A4 70 24 Nut SS ISO 3506 Grade A4 r e v e L 5 2 SS EN 10088 1 W 1 4401 26 Socket Set Screw 27 Nut SS ISO 3506 Grade A4 28 Hex Socket Head SS ISO 3506 Grade A4 29 Weight Grey iron EN 1561 EN GJL 30 Socket Set Screw SS EN 10088 1 A4 gr 70 31 Lifter DI ...

Page 4: ...workplace However AVK Valves technical staff are always available to answer any questions relating to problems that may not be covered by this manual AVK Valves products are designed and manufactured to be for purpose and to a high and reliable standard This provides a safe product with minimum risk to health when used correctly for the purpose for which it was designed However this assumes that t...

Page 5: ...he ground and protected by a weather proof cover Handling INSTALLATION Correct installation of the Series 641 Check Valve is important for proper operation It may be installed in either horizontal normal system operation then be done in graduated steps using the crossover tightening method The appropriate torques should be used ...

Page 6: ...Direction of Flow Front View Top View Fig 1 Horizontal Mountin page 5 Close position ...

Page 7: ...page 6 Direction of Flow Front View Rear View Fig 2 Vertical Mounting Close position ...

Page 8: ...Vertical Mounting Direction of Flow Direction of Flow Horizontal Mounting Fig 3 Optimal Leverage Configurations page 7 open position open position ...

Page 9: ...de Fig 4 the Lever onto the Hinge stem and position as shown in figure 4 Secure the Lever with the Washer and Nut and tighten Attach the Weight and tighten the hex screw and nut to hold the weight in place A medium strength thread locking compound such as Loctite should be used to attach the Lever and Weight Nut Spring Washer Lever Weight Socket set Hex Socket screw Nut ...

Page 10: ...n of Flow DN700 DN1000 HEX SOCKET HEAD Washer Nut Bracket for guard Guard back Distance Piece Guard front HEX SOCKET HEAD shown in figure 5 Secure the Lever with the Wahser and Nut and tighten Attach the Weight and tighten the hex screw to hold the weight in place A medium strength thread locking compound such as Loctite should be used to attach the Lever and Weight Attach the bracket for guard an...

Page 11: ...eds to be attached to the hinge stem Change the stud r e v o c c i t s a l p d n a d n a l g c i t s a l p e h t d e t n u o m e g n a l f d n a l G n o r e g n o l t i b e l t t i l a s a s t l o b Fig 6 DN700 DN1000 Cover Direction of Flow Cover for free shaft Nut Stud bolt Washer Gland for free shaft Gland Gland flange ...

Page 12: ...without outside shaft the valve can have a proximity switch option as figure 8 shown The bracket for the proximity can be mounted on the cover Check the cover make sure the boss on the cover at right position as figure 8 shown Then tighten the bracket with hex bolts D i r e c t i o n o f f l o w Fig 7 Switch 1 Proximity switch Mouting Plate Free shalft Set screw C Proximity switch Hex bolt Bracket...

Page 13: ...e operated even partially about once a month 2 Inspection Should be carried out thoroughly every six months If inspection of the valve is required follow the INSPECTION Instructions 3 O rings and O cord When faulty O rings and O cord are the cause of leaks care should be taken to ensure that the replacements are of the correct material 4 Vibration After lengthy periods of operation connecting bolt...

Page 14: ...losed Remove and inspect disc for damage Replace if necessary Ensure that the sealing surface in the valve body is clean and undamaged Valve does not open or close Verify operating pressure is high enough to open the valve Disassemble the valve to check for an obstruction in the valve or pipeline Gland flange Tightened the stud bolts on Gland flange If leakage persists replace the the ...

Page 15: ... or death before the cover can be removed If equipped with a lever weight and guard the front part guard may need 2 Remove the bolts nuts and washers from the cover take off the cover release the set screw on the lifter then lift the whole disc assembly 3 Release the stud bolts on Gland flange remove the Gland flange then take off the higne stem on the lever and weight Gland side figure 9 4 Inspec...

Page 16: ...lts and washers on position tighten the nut incrementally in a crossover Pattern to ensure that the cover doesn t bend and o cord is evenly compressed 5 If equipped any other stuff also remount them 4 If equipped with a lever and weight assembly remount weights if necessary If equipped with a lever and weight and guard assembly remount weights if necessary and remount front part guard at last by t...

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