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909 3/4”-2” - PowerPoint PPT Presentation

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909 3/4”-2”. Modification Overview. Production began in 1979 and is current. The 909M1 (1989) in the 11/4”-2” sizes only. Change was in the body only- internal components are the same. Check Cover Removal. Cover is o-ring sealed.

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modification overview
Modification Overview
  • Production began in 1979 and is current.
  • The 909M1 (1989) in the 11/4”-2” sizes only. Change was in the body only- internal components are the same.
check cover removal
Check Cover Removal
  • Cover is o-ring sealed.
  • Check valve assembly is attached to the cover and spring is contained.
  • Pull cover and assembly straight out of the body. (Do not twist)
check valve removal
Check Valve Removal
  • The check valve is attached to the cover with a bayonet locking system.
  • Check valve assembly is spring loaded.
  • Holding the assembly in both hands, rotate the seat (cage) ¼ turn.
check seat removal
Check Seat Removal
  • Once the cover and check valve are removed the seat or (cage) is free.
  • Seat is sealed by an o-ring.
check disc replacement
Check Disc Replacement
  • Check disc and disc holder can be replaced as one piece.
check valve reassembly notes
Check Valve Reassembly Notes
  • Reassemble check valve in reverse order.
  • Apply lubricant to seat o-ring and lid o-ring.
rv cover removal
RV Cover Removal
  • RV Cover is sealed by the diaphragm.
  • Spring load is contained.
rv stem removal
RV Stem Removal
  • The stem subassembly can be pulled straight out of the body.
rv seat removal
RV Seat Removal
  • Unless damaged, there is no need to remove the RV seat.
  • The RV seat is threaded and sealed by an o-ring.
  • A special tool is required to remove seat.
rv rubber replacement
RV Rubber Replacement
  • Replace diaphragm and RV disc assembly.

* Simply unscrew the stem cap from the stem.

  • Replace stem o-rings.
  • Apply lubricant to o-rings.
rv reassembly notes
RV Reassembly Notes
  • Insert RV stem assembly into body.

* Carefully guide and depress spring tension until the piston is completely into position.

* Insert screw driver up into vent opening to hold stem in place.

  • Bolt cover down evenly.