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860 21/2”-10” - PowerPoint PPT Presentation

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860 21/2”-10”. Modification Overview. Production of the 2½” – 10 sizes began in 1993. Lead free version (LF860) was introduced in 2011. Parts do not interchange with original versions. Check Cover Removal. Cover is bolted and o-ring sealed. There is a slight spring load on cover.

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Presentation Transcript
modification overview
Modification Overview
  • Production of the 2½” – 10 sizes began in 1993.
  • Lead free version (LF860) was introduced in 2011. Parts do not interchange with original versions.
check cover removal
Check Cover Removal
  • Cover is bolted and o-ring sealed.
  • There is a slight spring load on cover.
disassemble spring module
Disassemble Spring Module
  • The spring module is held in position by the cover.
  • Spring module is captured.
  • Remove the retaining clip and hinge pin from the arm assembly.
check disc replacement
Check Disc Replacement
  • The check disc is a vulcanized clapper plate.
  • Remove jam nut and washer from the back of the disc plate.

** When jam nut is tight, check disc is designed to “wobble”.

check seat removal
Check Seat Removal
  • The seat and arm must be removed as one piece.
  • The seat and arm assembly is bolted “through” the body and sealed by a gasket.
check seat removal1
Check Seat Removal
  • Locate and remove the four lock nuts on the “outside” of the body.
  • Pull the seat and arm assembly straight out of the body.
disassemble seat assembly
Disassemble Seat Assembly
  • Remove retaining clip and hinge pin from arm assembly.
  • Inspect bushings and hinge pins for wear.
check valve reassembly notes
Check Valve Reassembly Notes
  • Reassemble in reverse order.
  • The seat assembly, disc plate, and spring module can be assembled together and placed into the body as one component.
  • The seat ring will only fit into body one way, check the alignment of gasket and studs.
check valve reassembly notes1
Check Valve Reassembly Notes
  • The spring module is positioned by the cover.
  • Make sure the pivot bearing is resting in the pivot socket on the cover.
rv cover removal
RV Cover Removal
  • Remove external sensing line.
  • RV cover is sealed by the diaphragm.
  • No spring load on cover.
  • Remove outer diaphragm.
rv module removal
RV Module Removal
  • Module is o-ring sealed.
  • Pull module straight out of body.

* Grasp the module (button) with one hand and insert fingers (other hand) into RV port and apply force to the seat disc.

* Do not twist module.

rv seat removal
RV Seat Removal
  • RV seat is mounted between the RV housing and the RV adapter.
  • Remove the 4 bolts on the adapter and remove housing.
  • Seat is o-ring sealed.
  • Pull the seat straight out.
disassemble rv module
Disassemble RV Module
  • Place the module on a flat surface with lower guide facing up.
  • Hold the main stem with one hand and unscrew the lower guide.
disassemble rv module1
Disassemble RV Module
  • With lower guide removed, place the module upside down on a clean surface.
  • Remove center of protective sticker (Save).
  • Hold the button firmly and loosen screw.

* Button is spring loaded.

disassemble rv module2
Disassemble RV Module
  • Remove main stem and unthread the retainer.
  • Remove slip ring and inner diaphragm.
inner diaphragm replacement
Inner Diaphragm Replacement
  • Position the bead of the inner diaphragm into the groove of the upper guide.
  • Place slip ring over the diaphragm.
  • Thread retainer ring onto upper guide – (hand tight).
main stem replacement
Main Stem Replacement
  • Push the inner diaphragm back through the upper guide assembly.
  • Insert main stem inside diaphragm.
  • The screw hole on diaphragm and main stem should be lined up.
spring button replacement
Spring / Button Replacement
  • Position flow washer on diaphragm with the cross channels facing up.
  • Place the spring over the upper guide.
  • Place button on spring and hold down firmly.
  • Replace flow screw.
  • Reposition center label piece.
rv disc replacement
RV Disc Replacement
  • Replace the RV disc in main stem.
  • Replace the lower stem guide.
  • Replace and lubricate o-ring on main guide
rv reassembly notes
RV Reassembly Notes
  • Reassemble RV in reverse order.
  • Push the RV module straight into body.

** Do not twist.

  • Replace outer diaphragm with fabric side against button.
  • Work the rolled edge into the space between the module and body.