A flow measurement device includes a flow rate measurement unit, an arithmetic unit that calculates a difference value between a the first flow rate value and a second flow rate value, and a difference value conversion unit that calculates a flow rate ratio, based on the difference value. An appliance characteristic extraction unit extracts at least one appliance characteristic quantity indicating a characteristic of a flow rate change and a value calculated from a first flow rate value and a second flow rate value, as an appliance characteristic quantity. Furthermore, an appliance inherent characteristic information holding unit holds appliance inherent characteristic quantities indicating a characteristic flow rate state of a specific gas appliance, and an appliance discrimination unit discriminates a gas appliance, based on a comparison between the appliance characteristic quantity and the appliance inherent characteristic quantity.

The present invention controls convergent pressure of a closed space provided with a fluid resistance at high speed while an upstream valve provided on the upstream of the fluid resistance prevents overshooting. A pressure control system is provided with a fluid resistance in a channel forming a closed space and is configured to control pressure of the closed space by controlling an upstream valve provided on the upstream of the fluid resistance. The pressure control system includes a convergent pressure arithmetic unit and a valve controller. The convergent pressure arithmetic unit calculates convergent pressure of the closed space when the upstream valve is fully closed using at least one of upstream pressure and downstream pressure on the fluid resistance in the channel. The valve controller compares the calculated convergent pressure with a predetermined target convergent pressure and fully close the upstream valve based on the result of the comparison.

A filter assembly includes a conditioning device that conditions a flow of air upstream of a mass air flow sensor. The filter assembly includes a support frame. The filter assembly further includes a filter media coupled to the support frame, the filter media having a dirty side configured to receive a stream of air and a clean side configured to output a stream of air that has been filtered through the filter media. The filter assembly includes a conditioning device coupled to the support frame, the conditioning device positioned in a downstream direction from the clean side of the filter media with respect to the stream of air, the conditioning device offset from the clean side of the filter media by a separation distance.

A filter assembly includes a conditioning device that conditions a flow of air upstream of a mass air flow sensor. The filter assembly includes a support frame. The filter assembly further includes a filter media coupled to the support frame, the filter media having a dirty side configured to receive a stream of air and a clean side configured to output a stream of air that has been filtered through the filter media. The filter assembly includes a conditioning device coupled to the support frame, the conditioning device positioned in a downstream direction from the clean side of the filter media with respect to the stream of air, the conditioning device offset from the clean side of the filter media by a separation distance.

A device for monitoring evaporation capacity of a water surface evaporator in a process includes a water surface evaporator and a rain collector, the rain collector and the water surface evaporator having a same size of orifice area, height, and contour profile of a monitoring device. One side of the water surface evaporator is connected with a first measuring well through a pipeline, and another side of the water surface evaporator is connected with a first electromagnetic flowmeter, a water supplementing electromagnetic valve and an overflow electromagnetic valve through a water pipe. The water supplementing electromagnetic valve is connected with a water supplementing barrel through a water supplementing pipe. A water collecting barrel is installed below the special rain collector. A second magnetostrictive water level meter, a starting drainage switch and a stopping drainage switch are installed in the second measuring well.

A natural gas automatic shutoff system can analyze the flow rate of natural gas through a pipe. When an anomaly is detected, the device can prevent further flow of natural gas through the pipe and can automatically notify the homeowner or authorized monitor, such as through a cell phone application or other device. Additionally, the homeowner or authorized monitor can manually control and/or monitor the flow of gas through the pipe in real-time, such as through a cell phone application or other device. At least one exemplary embodiment uses a motorized ball valve to control the flow of gas, a flow meter to measure the rate of natural gas flow through the pipe, and a microcomputer to analyze the flow and send notifications to the homeowner or authorized monitor.

A valve assembly includes a first housing that defines an inlet and a fluid output chamber. A second housing is engaged to the first housing and a cover is engaged to the second housing. A valve member is positioned within the first housing. An actuator is positioned between the second housing and the cover and is attached to the valve member through an engagement located within the first housing. A flow rate sensor, as a component of the valve assembly, may be positioned downstream of the inlet and the fluid output chamber.

An apparatus and method for operating water meter valves is disclosed herein. A water meter tool includes a body extending longitudinally from a first end to a second end. The body includes a water meter valve key at the first end and a hole formed through the body between the first and second ends, where a center line of the hole is in a transverse plane of the body. The water meter tool includes a movable cross arm disposed through the hole, where the movable cross arm extends along a longitudinal axis from a first arm end to a second arm end, and where the movable cross arm includes a first box key proximate the first arm end.

An apparatus and method for operating water meter valves is disclosed herein. A water meter tool includes a body extending longitudinally from a first end to a second end. The body includes a water meter valve key at the first end and a hole formed through the body between the first and second ends, where a center line of the hole is in a transverse plane of the body. The water meter tool includes a movable cross arm disposed through the hole, where the movable cross arm extends along a longitudinal axis from a first arm end to a second arm end, and where the movable cross arm includes a first box key proximate the first arm end.

A water meter system and method may provide inline flow monitoring and leak detection that may track real-time water usage. The water meter system and method may utilize one or more dual pressure sensors and/or ultrasonic sensors to detect leaks quickly and automatically turn off a valve. A spool may be utilized that may provide the dual pressure sensors on opposite sides of a ball valve to separate upstream and downstream pressure zones when the valve is closed.