Patent ID: 8141577
Filing Date: 2012-03-27
Classification: B60W,F16K,G08G,Y10T

Abstract:
1. A liquid filled pressure/vacuum valve comprising: a body having an inlet and an outlet coupleable to atmosphere; a suction zone disposed in said body and fluidly coupled to said inlet; a pressure zone disposed in said body and fluidly coupled to said outlet, said pressure zone in fluid communication with said suction zone; and a fluid disposed in said body and configured to flow between said suction zone and said pressure zone, said flow of said fluid is determined by an increased force due to a pressure differential between said suction zone and said pressure zone, wherein said suction zone has a first wide flow passage fluidly coupled to a first narrow flow passage such that the fluid will flow from said first narrow flow passage to said first wide flow passage when atmospheric pressure is greater than a pressure at said inlet; and said pressure zone has a second wide flow passage fluidly coupled to a second narrow flow passage, said second narrow flow passage in fluid communication with said first narrow flow passage, such that the fluid will flow from said second narrow flow passage to said second wide flow passage when atmospheric pressure is less than a pressure at said inlet, said suction zone and said pressure zone sized and configured so that a vacuum operational setting differs from a pressure operational setting, said vacuum operational setting is about 6 inches to about 10 inches water column vacuum and said pressure operational setting is about 2.5 inches to about 6 inches water column pressure.