What is Pressure-Balancing?

The pressure-balancing principle maintains the pre-selected shower temperature by instantly and continually balancing the hot and cold water pressure as demands are made by toilets, dishwashers, etc., elsewhere in the system. The heart of the Symmons pressure-balancing mixing valve is a precision-crafted piston that "floats" between Hot and Cold water supplies. As pressure from either source drops, the piston moves to compensate for the drop, thereby maintaining correct temperature. A standard feature on all Symmons pressure-balancing systems is an adjustable stop screw. A simple screwdriver adjustment will restrict the handle to a maximum temperature level.

 

Equal hot and cold pressure supply: piston is in center position, allowing equal inlet openings for hot and cold.	High hot pressure and low cold pressure supply: piston moves toward cold end and reduces open ings at hot end, thus reducing hot pressure to equal cold. Temperature remains at original setting.

 

Low hot pressure and high cold pressure supply: piston moves toward hot end and reduces openings at cold end, thus reducing cold pressure to equal hot. Temperature remains at original setting.	Cold water supply failure: piston moves to extreme position at cold end, closing hot openings completely, thereby reducing hot pressure in valve to zero. Result: water flow through valve is completely shut off. In the event of hot water supply failure, the opposite sequence occurs.

Tags: pressure balancing, symmons, anti scald