774X DCDA 21/2”, 6”, 8” 774X DCDA 21/2”, 6”, 8”. Modification Overview  Production began in 1998.  The 2 ½” 774X DCDA was discontinued in 2003.  The.

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Presentation transcript:

774X DCDA 21/2”, 6”, 8” 774X DCDA 21/2”, 6”, 8”

Modification Overview  Production began in  The 2 ½” 774X DCDA was discontinued in  The 6” and 8” sizes were discontinued in  All “X” assemblies use check modules that are one size smaller than the pipe size. * Example: 8” size assembly uses 6” parts * Example: 8” size assembly uses 6” parts

Single Access Cover Removal  Cover is secured by a grooved coupling.  Cover has no spring load.

Check Valve Removal  Check valve modules are called “Cam Checks”.  Checks are o-ring sealed and threaded into body.  #1 Check must be removed before #2 can be removed.

Check Valve Removal  Cam checks unscrew counterclockwise by hand “if possible”. *Do not use cam arm as a handle to unscrew. *Do not use cam arm as a handle to unscrew.

Check Valve Removal  If too tight, place a drift punch or solid rod (long screwdriver) in one of the holes on the outer edge of the check module.  Tap with hammer in correct direction (counterclockwise) to loosen.

Check Valve Removal Notes  There are “special tools” available to help remove check modules.

Check Seat Removal  Check seats are part of each module and can not be removed.  If the seat is damaged, the complete check module will need to be replaced.

Check Disc Inspection 6”  The disc assembly is part of the module and can not be removed.  For inspection and cleaning, lift the cam arm and hold in open position. *Raise the clapper so that the end of the cam arm rests between the roller and clapper. *Raise the clapper so that the end of the cam arm rests between the roller and clapper.

Check Disc Inspection 8”  For inspection and cleaning locate the stud on the outlet flange of the assembly.  Place the cam arm hole on the stud and open the check valve so that the cam rests between the roller and clapper.

Check Valve Reassembly Notes  Change and lubricate check o-ring.  Install #2 check first then #1 check.  # 2 check should be tightened with a long screwdriver.  Tighten #1 check firmly by hand only.  Lubricate the outside edge of the groove coupler gasket.