Patent ID: 8381761

Claim:
A pilot valve assembly that controls a pressure reducing valve of a water supply system between high pressure and low pressure set points, the assembly comprising: a body defining an interior cavity; a first diaphragm assembly within the cavity and including a first diaphragm having a first surface thereof at least partially defining a first fluid pressure chamber in fluid communication with a fluid passageway formed in the body, and a first biasing means for biasing the first diaphragm; and a second diaphragm assembly within the cavity and including a second diaphragm having a first surface thereof at least partially defining the first fluid pressure chamber, and a second surface thereof at least partially defining a second fluid pressure chamber in fluid communication with a fluid inlet and a fluid outlet formed in the body, and a gate disposed between the fluid inlet and the fluid outlet for controlling fluid flow through the second fluid pressure chamber, and a second biasing means for biasing the gate and the second diaphragm; wherein fluid pressure at the outlet of the second chamber is substantially equal to outlet pressure of the pressure reducing valve; and wherein a second surface of the first diaphragm at least partially defines a third chamber within the body having atmospheric pressure.