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AVK 41 Series, Field Maintenance And Instruction Manual

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American AVK Company

An ISO 9001 registered company

Maintenance Manual Series 41

*Subject to change without notice. (rev. 06/20 H)

AVK SERIES 41 SWING CHECK VALVE
FIELD MAINTENANCE AND INSTRUCTION 
MANUAL FOR SWING CHECK VALVES 3" - 12"

TABLE OF CONTENTS
EXPLODED ASSEMBLY / PARTS LIST

INTRODUCTION / DESCRIPTION 

RECEIVING AND STORAGE 

INSTALLATION

- SWING

- 

LEVER AND WEIGHT

- 

LEVER AND SPRING 

MAINTENANCE 

TROUBLESHOOTING 

DISASSEMBLY FOR INSPECTION 

RE-ASSEMBLY AFTER INSPECTION

REPAIR PROCEDURES

- 

HEAD REPLACEMENT

- 

SEAL REPAIR KIT

- 

SEAL/DISC KIT

OPTIONAL EQUIPMENT

- 

PRIMING/BACKFLOW ACTUATOR (OPTIONAL, 3-inch through 8-inch) 

PARTS AND SERVICE 

WARRANTY

AMERIC

AN A

VK C

OMP

ANY

Summary of Contents for 41 Series

Page 1: ...3 12 TABLE OF CONTENTS EXPLODED ASSEMBLY PARTS LIST INTRODUCTION DESCRIPTION RECEIVING AND STORAGE INSTALLATION SWING LEVER AND WEIGHT LEVER AND SPRING MAINTENANCE TROUBLESHOOTING DISASSEMBLY FOR INSPECTION RE ASSEMBLY AFTER INSPECTION REPAIR PROCEDURES HEAD REPLACEMENT SEAL REPAIR KIT SEAL DISC KIT OPTIONAL EQUIPMENT PRIMING BACKFLOW ACTUATOR OPTIONAL 3 inch through 8 inch PARTS AND SERVICE WARRA...

Page 2: ... Bolt 412 Bonnet Gasket 413 Disc 414 Shaft Nut 415 Shaft Washer 416 Lever 417 Open Bushing 418 Inner Bushing O ring 419 Weight 420 Set Screw 422 Closed Bushing 429 Bonnet O RIng As of March 1st 2008 on 3 through 8 valves the Disc Lock Washer and Disc Nut are replaced by a self locking Disc Nut As of June 2014 additional o rings included in new style bonnet assemblies fo 3 through 8 valves 409 408 ...

Page 3: ...12 Stainless Steel 431 Retaining Washers 10 12 Stainless Steel 432 Shaft Spacers 10 12 Stainless Steel 433 Spring Arm Washer 10 12 Stainless Steel 434 Spring Arm Nut 10 12 Stainless Steel 435 Spring Arm rod 10 12 Stainless Steel 436 Spring Bracket Mount Bolt 10 12 Stainless Steel 437 Spring Arm Spacer 10 12 Stainless Steel 438 Priming Actuator Seal Washer Fiber 439 Priming Actuator Body Brass 440 ...

Page 4: ...ure to be released resulting in severe injury or death Correct installation of the Series 41 Check Valve is important for proper operation It may be installed in either horizontal or vertical flow up applications If installed in the vertical flow up position a lever and weight or lever and spring assembly must be used to ensure proper valve operation See figures 2 3 and 4 for proper positioning of...

Page 5: ...page 4 Top View Direction of Flow Fig 2 Horizontal Mounting Front View ...

Page 6: ...page 5 Fig 3 Vertical Mounting Direction of Flow Rear View Front View ...

Page 7: ...Open Position Closed Position Open Position Closed Position page 6 Fig 4 Optimal Leverage Configurations Horizontal Mounting Vertical Mounting Direction of Flow Direction of Flow ...

Page 8: ...de the Lever 416 onto the Shaft 408 and position as shown in figure 4 Secure the Lever with the Shaft Washer 415 and Shaft Nut 414 and tighten to 30 ft lbs Attach the Weight 419 and tighten the Set Screw 420 to hold the weight in place A medium strength thread locking compound such as Locktite 242 should be used to attach the Lever and Weight WARNING The weight can be moved on the lever to adjust ...

Page 9: ... the Spring Eyebolt Nuts 426 and Spring Eyebolt Washers 427 one washer and nut on each side of the Spring Bracket 428 Slide the Lever 416 onto the Shaft 408 and position as shown in figure 4 Secure the Lever with the Shaft Washer 415 and Shaft Nut 414 and tighten to 30 ft lbs Attach Spring 424 in it s relaxed position as shown in figure 6 A medium strength thread locking compound such as Locktite ...

Page 10: ...6 424 426 425 437 427 428 448 449 page 9 INSTALLATION continued LEVER AND SPRING 10 12 OPTIONAL For Lever and Spring equipped 10 inch and 12 inch swing check valves the Lever and Spring Assembly is installed at the factory Fig 7 Lever Spring Mounting 10 12 Bent Tab on Lock Washer ...

Page 11: ...eshooting the valve Leakage at the shaft bushings Open Bushing 417 Closed Bushing 422 Ensure that the shaft bushings are properly tightened to 45 ft lbs If leakage persists replace the Inner and Outer Bushing O rings 418 429 with an AVK Series 41 seal replacement kit Leakage at the Bonnet Ensure that the bonnet bolts are tightened to 45 ft lbs If leakage persists replace bonnet gasket 412 Valve le...

Page 12: ...vere injury or death 1 Refer to Figure 8 If equipped with a lever and spring disconnect the spring 424 from the lever 416 If equipped with a lever and weight the weights may need to be removed from the lever before the head assembly can be removed Remove the Bonnet Bolts 406 and Bonnet Washers 405 from the Bonnet 407 Note bolt length when he bolts are removed The bonnet bolts are different lengths...

Page 13: ...he bonnet bolts are properly located by their length The longer bonnet bolts are upstream The bonnet bolts will hold the Bonnet Gasket in place 3 Pick up the head assembly holding the bolts and Bonnet Gasket in place and mount it on the valve body Ensure that the disc is facing the proper direction and that the Bonnet Gasket is not being pinched between the bonnet and valve body 4 Tighten the bonn...

Page 14: ... 2 Remove the head assembly according to the DISASSEMBLY FOR INSPECTION section 3 Remove the Lever 416 if equipped by removing the Shaft Nut 414 and Shaft Washer 415 and place aside for later use 4 Install the new head assembly according to the REASSEMBLY AFTER INSPECTION section Install the lever removed in step 3 above according to LEVER AND WEIGHT or LEVER AND SPRING installation procedures AVK...

Page 15: ...through 8 inch without a lever have Bonnet O rings 429 only b Valve sizes 10 inch and 12 inch without a lever have two two 2 Bonnet O rings 429 only c Valve sizes 10 inch and 12 inch equipped with a lever have two 2 Inner Bushing O rings 418 located inside the Open Bushing 417 and two 2 Bonnet O rings 429 d 3 inch through 8 inch valves equipped with a lever have two 2 Inner Bushing O rings 418 loc...

Page 16: ...ed inside the Open Bushing 417 and two 2 Bonnet O rings 429 4 Slide the Shaft Hinge Disc assembly from the bonnet 407 5 Remove the Disc Nut 401 Disc Bushing 403 Disc Washer 402 and Disc Lock Washer 423 to remove Disc 413 from Hinge 404 NOTE On 10 inch and 12 inch valves a tab on the Disc Lock Washer must be bent to remove the lock washer See figure 7 6 Reassemble the Shaft Hinge Disc assembly as s...

Page 17: ...oved from installation prior to approval from American AVK this warranty shall be void As to motors gearing or accessory equipment purchased by American AVK Company from other manufacturers and used or incorporated into American AVK Company s products those manufacturers warranties shall apply American AVK Company s sole responsibility shall be in its sole discretion to replace the product with th...

Page 18: ...page 17 NOTES ...

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