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DeZurik APCO CVS-250, Instruction Manual, Page: 15 / 16

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DeZurik APCO CVS-250 Instruction Manual Download Page 15

DeZURIK

 

 APCO CVS-250/250A Swing Check Valves 

October 2018 

Page 15 

D12003 

Troubleshooting 

Condition 

Possible Cause 

Corrective Action 

Shaft seal leaks. 

Packing is worn. Packing is not 
tight. 

Replace Packing. Adjust 
packing. 

Valve leaks excessively from 
one side of the disc to the other. 

Foreign matter caught between 
disc and seat. 

Fully open valve to remove 
object. 

Disc seat is worn or damaged. 

Repair disc seat or replace 
valve. 

Valve leaks at flange joint. 

Loose flange bolting. 

Tighten flange bolting. 

Blown flange gasket. 

Replace flange gasket. 

Misalignment or damage to field 
piping and supports. 

Adjust misalignment or repair 
piping or supports. 

Damaged flange face/s or 
improper flange connections. 

Repair flange, replace valve 
body or adjust flange 
connections. 

Valve does not fully close. 

Object is wedged between seat 
and disc. 

Fully open valve to remove 
object. 

Packing Gland is too tight 

Loosen packing gland fasteners.  
Packing may need to be 
replaced if leakage occurs. 

 

Summary of Contents for APCO CVS-250

Page 1: ...DeZURIK Inc Sartell Minnesota USA Phone 320 259 2000 www dezurik com info dezurik com APCO CVS 250 250A SWING CHECK VALVES Instruction D12003 October 2018 ...

Page 2: ...ion during shipment however items can be damaged in transport Carefully inspect the unit for damage upon arrival and file a claim with the carrier if damage is apparent Parts Replaceable wear parts are listed on the assembly drawing These parts can be stocked to minimize downtime Order parts from your local DeZURIK sales representative or directly from DeZURIK When ordering parts please provide th...

Page 3: ...ance 5 Shaft Packing Adjustment 5 Shaft Packing Replacement 6 Disc Seat Replacement 6 Changing Counterweight or Spring Assembly to Opposite Side of Valve 7 Adding Air Cushion Assembly to Valve 8 Operation 9 Closure Speed Control Adjustment Valves with Lever Weight 9 Closure Speed Control Adjustment Valves with Air Cushion 9 Start up Procedure 10 Adjustment Valves with Air Cushion with Lever Weight...

Page 4: ...elayed place valve indoors in secure weather tight storage If temporary outside storage is unavoidable make sure a vermin proof rain cover water shedding tarp etc is secured around over the equipment to keep off rain and mud Skid and set the assembly on a flat solid and well drained surface for protection from ground moisture runoff and pooled rain water Installation The APCO CVS 250 250A Swing Ch...

Page 5: ...ping Maintenance It is suggested that these valves which do not require routine scheduled maintenance be included as part of the normal facility equipment inspections for any malfunction while under normal usage conditions Shaft Packing Adjustment Packing adjustment may be needed to optimize packing life on initial start up These valves may open or close swinging the counterweight spring lever arm...

Page 6: ...packing from the parts list Cut the packing rings to fit around the shaft Install one ring at a time Make sure it is clean and has not picked up any dirt in handling before installing it Lubricate I D of each packing ring Joints of successive rings should be staggered at least 90 degrees apart Each ring should be firmly seated with a tamping tool Do not depend on the packing gland entirely to seat...

Page 7: ... and Studs A49 from the Body A01 5 Remove the Screws A16 and Pivot Shaft Cover A15 from the Body A01 6 Remove the Eye Nuts A64 Nuts A52 Screws A04 Washers A51 and Cover A02 from the Body A01 7 Loosen the Screws A14 in the Disc Arm A09 8 Insert a threaded bolt 1 4 20 into the Pivot Shaft Retaining Pin A60 and remove the pin from the pin hole in the top of the Body A01 9 Remove the Pivot Shaft A13 f...

Page 8: ...eight B29 or Spring B59 to the Pivot Shaft A13 If equipped with lever spring install Spring Bracket B60 assembly to Body A01 using Spring Bracket Bolts B62 then hook end of spring thru Eye Bolt B61 Adding Air Cushion Assembly to Valve These valves may open or close swinging the counterweight spring loaded arm without warning due to flow changes from pumps starting and stopping Servicing or working...

Page 9: ...vity to close the Disc A10 towards the Body Seat Ring A05 For valves equipped with a lever weight the weight causes the disc close faster or slower depending on its position along the lever For valves equipped with an air cushion the closure speed can be dampened by the air cylinder B20 As the Disc A10 closes the cylinder piston is pushed downwards and the compressed air can only escape through th...

Page 10: ...ntrol Valve one half 1 2 turn clockwise Repeat start and stop If slam persists continue turning adjusting screw in turn increments Be careful not to fully close Flow Control Valve Slam persists Move weight towards end of lever a couple of inches Repeat start and stop Slam still persists Continue repeating above steps until satisfactory closing is achieved Then increase opening discharge isolation ...

Page 11: ...DeZURIK APCO CVS 250 250A Swing Check Valves October 2018 Page 11 D12003 Drawings Figure 2 APCO CVS 250 250A Swing Check Valve with Air Cushion ...

Page 12: ...DeZURIK APCO CVS 250 250A Swing Check Valves D12003 Page 12 October 2018 Drawings Continued Figure 3 CVS 250 250A Swing Check Valve Lever Weight ...

Page 13: ...m Retaining Screw A14 Hex Bolt B46 Reducer Bushing 8 42 A15 Pivot Shaft Cover B47 Pipe Nipple A16 Hex Bolt B48 Pipe Elbow A17 Packing B55 Lever Arm Bolt Weighted Lever only A18 Shaft Cover Seal B58 Air Breather A31 Seat Retaining Ring B59 Cushion Lever Clevis Pin Air Cushion only A32 Machine Screw B60 Retaining Ring Air Cushion only A33 Pivot Shaft Disc Key B61 Clevis Pin Air Cushion only A37 Pack...

Page 14: ...pring Parts Item Number Description B19 Lever Arm Spring Only B49 Spring Lever Arm Key Spring Only B55 Spring Lever Arm Retainer Screw Spring Only B59 Spring Spring Only B60 Spring Bracket Spring Only B61 Eye Bolt Spring Only B62 Spring Bracket Bolt Spring Only B63 Eye Bolt Retaining Nut Spring Only B64 Spring Bracket Washer Spring Only B65 Washer Spring Only ...

Page 15: ... damaged Repair disc seat or replace valve Valve leaks at flange joint Loose flange bolting Tighten flange bolting Blown flange gasket Replace flange gasket Misalignment or damage to field piping and supports Adjust misalignment or repair piping or supports Damaged flange face s or improper flange connections Repair flange replace valve body or adjust flange connections Valve does not fully close ...

Page 16: ...ll be the only effective guarantee or warranty binding on Seller despite anything to the contrary contained in the purchase order or represented by any agent or employee of Seller in writing or otherwise notwithstanding including but not limited to implied warranties THE FOREGOING REPAIR AND REPLACEMENT LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES OBLIGATIONS AND LIABILITIES INCLUDING ALL W...

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