Abstract: A fluid control system may include a fluid conduit defining a fluid passage, and a fluid metering assembly in fluid communication with the fluid passage. The fluid metering assembly may include a metering valve rotatably secured within an internal chamber. An actuator may be coupled to the metering valve. A control unit may be coupled to the actuator. The control unit is configured to operate the actuator to rotate the metering valve between an open position in which fluid flows through the fluid passage and a closed position in which the fluid is prevented from flowing through the fluid passage. The control unit is configured to operate the actuator to rotate the metering valve into a pressure relief position beyond the closed position that is configured to allow a reduced portion of the fluid to flow through the fluid passage.

Abstract: A fluid control system may include a fluid conduit defining a fluid passage, and a fluid metering assembly in fluid communication with the fluid passage. The fluid metering assembly may include a metering valve rotatably secured within an internal chamber. An actuator may be coupled to the metering valve. A control unit may be coupled to the actuator. The control unit is configured to operate the actuator to rotate the metering valve between an open position in which fluid flows through the fluid passage and a closed position in which the fluid is prevented from flowing through the fluid passage. The control unit is configured to operate the actuator to rotate the metering valve into a pressure relief position beyond the closed position that is configured to allow a reduced portion of the fluid to flow through the fluid passage.

Abstract: An ultrasonic liquid-height detector employs conductive rods extending from a housing, and corresponding transducers, into a liquid, where elastic seals surround the rods at their exit point from the housing. Acoustic crosstalk between the rods through the seals and the housing (rather than through the liquid) is minimized by displacing the seals from each other as measured through the housing to increase a path length through the housing so that the crosstalk energy is delayed with respect to the direct energy indicating liquid height. A sampling window is positioned to sample transmitted sound across the rods at a time before the arrival of the crosstalk energy.

Abstract: An ultrasonic liquid-height detector employs conductive rods extending from a housing, and corresponding transducers, into a liquid, where elastic seals surround the rods at their exit point from the housing. Acoustic crosstalk between the rods through the seals and the housing (rather than through the liquid) is minimized by displacing the seals from each other as measured through the housing to increase a path length through the housing so that the crosstalk energy is delayed with respect to the direct energy indicating liquid height. A sampling window is positioned to sample transmitted sound across the rods at a time before the arrival of the crosstalk energy.