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4V-500 ½”-2” - PowerPoint PPT Presentation


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4V-500 ½”-2”. Modification Overview. Production of the 4V-500 PVB began in 1998. The 4V utilizes a float assembly that contains a relief valve that protects the unit against freeze damage. Canopy Removal. The canopy is secured by two screws. Bonnet Removal.

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Presentation Transcript
modification overview
Modification Overview
  • Production of the 4V-500 PVB began in 1998.
  • The 4V utilizes a float assembly that contains a relief valve that protects the unit against freeze damage.
canopy removal
Canopy Removal
  • The canopy is secured by two screws.
bonnet removal
Bonnet Removal
  • The bonnet is threaded into the body and sealed by an o-ring.
  • Unscrew the bonnet counter clockwise.
  • There is no spring load.
float removal and service
Float Removal and Service
  • The float is part of the bonnet assembly.
  • If the float or float spring is damaged, the bonnet must be replaced.
check valve removal 1
Check Valve Removal ½”-1”
  • The check valve is a module.
  • The check valve is threaded into the body and sealed by an o-ring.

* Note: A special tool is needed to remove the check module.

check valve removal 11 4 2
Check Valve Removal 11/4”-2”
  • The 11/4” & 11/2” check modules are secured by a retainer that is threaded into the body.
  • The 2” check valve is not modular and is spring loaded.
  • Unscrew the spring retainer counter clockwise.
check disc replacement
Check Disc Replacement
  • The ½”-11/2” rubber discs are part of the check module.
  • If the disc is damaged, the check module must be replaced.
  • The 2” disc is free once the screw and retainer are removed.
check seat replacement
Check Seat Replacement
  • The ½”-11/2” check seats are part of the check module.
  • If the seat is damaged, the module must be replaced.
  • The 2” check seat is threaded into the body and sealed by an o-ring.
  • A special tool is needed for seat replacement.
reassembly notes
Reassembly Notes
  • Reassemble in reverse order.
  • Lubricate the bonnet and check o-rings.