Abstract: A liquid filled pressure/vacuum valve for underground storage tanks has a body having an inlet coupled to the UST and an outlet coupled to atmosphere. The valve has a suction zone disposed in the body and fluidly coupled to the inlet. The valve has a pressure zone disposed in the body and fluidly coupled to the outlet, with the suction zone in fluid communication with the pressure zone. The valve has a separator disposed in fluid communication with the outlet and the pressure zone, and a fluid that flows between the suction zone and pressure zone. The flow of fluid is determined by an increased force due to a pressure differential between the suction zone and pressure zone.

Abstract: The present invention relates to a sensor system that uses two sensors for measuring and monitoring of angular position of a member in two or three axes. The sensor system of the present invention preferrably uses a pair of magnetoresistive sesors that are maintained in the same plane and in orthogonal configuration with respect to each other, and which reference their position according to the Earth's magnetic field or a magnetic field provided by a user. Accordingly, the sensors of the present invention are useful for a variety of purposes, including, virtually any application that requires monitoring and measurement of any combination of roll, pitch, and yaw.