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830, 831 4”- 6”

830, 831 4”- 6”. Modification Overview. Production of the 830/831 series began in 2000 for 4”-6” sizes only Production was discontinued in 2006. The 831 DCDA uses a ¾” 850B bypass. Single Access Cover Removal. Cover is o-ring sealed. Cover has no spring load. Check Valve Removal.

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830, 831 4”- 6”

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  1. 830, 831 4”- 6”

  2. Modification Overview • Production of the 830/831 series began in 2000 for 4”-6” sizes only • Production was discontinued in 2006. • The 831 DCDA uses a ¾” 850B bypass.

  3. Single Access Cover Removal • Cover is o-ring sealed. • Cover has no spring load.

  4. Check Valve Removal • Check valve modules. • Modules sealed by o-ring and secured by a retainer. • Slide retainer and flow insert straight out of body.

  5. Check Valve Removal • Remove the first check by sliding the module down stream. • Remove the second check by using a screwdriver flat to free the module from the body.

  6. Disassemble Check Valve • Hold the module firmly with the disc retainer cone facing up. • Using a large flat head screwdriver, unscrew the retainer counter clockwise.

  7. Disassemble Check Valve • Turn the module over. • Module is spring loaded – Hold firmly. • Use an 1/8” allen wrench to remove the socket head cap screws.

  8. Check Seat Inspection • The check seat is free once the module is disassembled.

  9. Check Disc Replacement • The disc holder and disc are free once the module is disassembled.

  10. Check Valve Reassembly Notes • Reassemble in reverse order. • Apply lubricant to seat o-ring.

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