A flow control valve assembly has at least one manifold having an inlet flow port, an outlet flow port, and a flow channel provided there between, the flow channel having an inlet chamber, a variable area chamber and an outlet chamber, with fluid flowing from the inlet flow port to the inlet chamber, the variable area chamber and the outlet chamber, in that order, before exiting the outlet flow port. The flow control valve assembly further includes a float assembly having a fitting, a float extending through the flow channel from the fitting and which is limited for its movement inside the variable area chamber, a measuring device that measures the displacement of the float and which is secured to the fitting and positioned outside the flow channel, and a connecting rod which connects the float to the measuring device and extends through the flow channel.

A system includes a pipeline and a valve mechanism defining an adjustable orifice. An actuator is coupled to the valve mechanism and operable adjust a size of the adjustable orifice. An upstream pressure sensor senses pressure of the fluid and an adjustment controller is communicatively coupled to the actuator and the upstream pressure sensor, wherein the adjustment controller actuates the actuator to adjust the size of the adjustable orifice based on data received from the upstream pressure sensor. A differential pressure sensor measures differential pressure across the adjustable orifice and a temperature sensor senses temperature of the fluid downstream from the adjustable orifice. A calculation controller is communicatively coupled to the adjustment controller, the differential pressure sensor, and the temperature sensor, wherein the calculation controller calculates flow rate of the fluid based on data received from the differential pressure sensor, the temperature sensor, and the adjustment controller.

A system includes a pipeline and a valve mechanism defining an adjustable orifice. An actuator is coupled to the valve mechanism and operable adjust a size of the adjustable orifice. An upstream pressure sensor senses pressure of the fluid and an adjustment controller is communicatively coupled to the actuator and the upstream pressure sensor, wherein the adjustment controller actuates the actuator to adjust the size of the adjustable orifice based on data received from the upstream pressure sensor. A differential pressure sensor measures differential pressure across the adjustable orifice and a temperature sensor senses temperature of the fluid downstream from the adjustable orifice. A calculation controller is communicatively coupled to the adjustment controller, the differential pressure sensor, and the temperature sensor, wherein the calculation controller calculates flow rate of the fluid based on data received from the differential pressure sensor, the temperature sensor, and the adjustment controller.

A variable area flowmeter having a float and having a display unit, the display unit includes a pointer element, the pointer element is connected directly or indirectly to the float such that the pointer element is mechanically deflected by the float during the measuring process. The variable area flowmeter that operates particularly reliably and is flexibly applicable at the same time is achieved in that the display unit comprises at least one bi-stable display which only requires an energy supply in order to modify the displayed representation and/or to restore the representation.

A variable area flowmeter having a float and having a display unit, the display unit includes a pointer element, the pointer element is connected directly or indirectly to the float such that the pointer element is mechanically deflected by the float during the measuring process. The variable area flowmeter that operates particularly reliably and is flexibly applicable at the same time is achieved in that the display unit comprises at least one bi-stable display which only requires an energy supply in order to modify the displayed representation and/or to restore the representation.

A system may include a flow sensor and a base. The flow sensor may include a flow tube, a sensor configured to characterize at least one attribute of a fluid in the flow tube, and an electrical contact in electrical communication with the sensor. The flow tube may include a fluid inlet at a first end of the flow tube, a fluid outlet at a second end of the flow tube, a fluid injection port between the first and second ends of the flow tube, and a valve configured to control a flow of a fluid in the flow tube. The base may include a processor, an electrical contact in electrical communication with the processor, a short range wireless communication device, and a display. The flow sensor electrical contact may be in electrical communication with the base electrical contact when the flow sensor is connected to the base.

A system may include a flow sensor and a base. The flow sensor may include a flow tube, a sensor configured to characterize at least one attribute of a fluid in the flow tube, and an electrical contact in electrical communication with the sensor. The flow tube may include a fluid inlet at a first end of the flow tube, a fluid outlet at a second end of the flow tube, a fluid injection port between the first and second ends of the flow tube, and a valve configured to control a flow of a fluid in the flow tube. The base may include a processor, an electrical contact in electrical communication with the processor, a short range wireless communication device, and a display. The flow sensor electrical contact may be in electrical communication with the base electrical contact when the flow sensor is connected to the base.

A flow or level switch comprises a sensor/switch assembly which is adapted for mounting in connection with either a fitting having an offset defining a channel to detect fluid flow through an orifice into the channel or a tank having a ball float to detect the level of the ball float in the tank. A switch module comprises a control rod which reciprocates and activates a switch unit having a bi-positionable contact member. A follower, which may be in the form of an axle with an angularly fixed projection, engages the control rod to cause the contact member to move.

A method for utilizing a gas sampling panel is provide, including at least one system sample gas inlet, a purge gas inlet, a system outlet, a system vent outlet, a purge gas valve, at least one manifold station valve, a regulator isolation valve, a regulator, a flow meter inlet valve, a flow meter, a flow meter outlet valve, a relief valve, a process valve, a process check valve, a purge check valve, and a vent check valve.

A method for utilizing a gas sampling panel is provide, including at least one system sample gas inlet, a purge gas inlet, a system outlet, a system vent outlet, a purge gas valve, at least one manifold station valve, a regulator isolation valve, a regulator, a flow meter inlet valve, a flow meter, a flow meter outlet valve, a relief valve, a process valve, a process check valve, a purge check valve, and a vent check valve.