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/ PBV Principals
Tempress - Working Principle
 
  The Tempress cartridge / valve is a 'diaphragm' operated pressure balanced valve.
     
 
  • Turning the handle counter-clockwise will turn the throttle disk so it first opens the Cold water.
  • Continued turn opens/mixes the Hot water to desired warm temperature.
  • Depending on supply temperature and pressure, at approximately mid-position, the shower temperature will be at normal (100 F).
  • The Hot and Cold pressures are now fully balanced and working on both sides of the diaphragm.
  • A drop in Cold supply (flushing toilet or other fixture used) will cause the flow tube housing to be 'pushed over' by the now relative higher Hot water pressure thus opening the cold inlet and closing the Hot inlet, until the pressure ratio between the Hot and Cold supply is restored. The net effect is unchanged shower temperature, or "Safety Mix".
  • If the Hot water pressure drops the same action / result happens.
  • The reaction time for the cartridge/valve is a mere fraction of a second and if the Cold water pressure (supply pressure) is cut - off, the valve will automatically restrict water flow to less than .039 gpm, a mere trickle.
 
   
  RPB Cartridge TEMPRESS II Cartridge
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