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A flow meter which maintains a constant pressure differential but varies the orifice area with flow, such as a rotameter or piston meter.



Related Terms

PERMEABILITY

The relationship of flow per unit area to differential pressure across a filter medium.

DRAG-BODY FLOWMETER

Device to meter liquid flow; measures the net force parallel to the direction of flow; the resulting pressure difference is used to solve flow equations.

EFFECTIVE DISCHARGE AREA

A nominal or calculated area of flow through a pressure relief valve for use in flow formulas to determine valve capacity.

PLAN EQUATION

The mathematical statement that horsepower plan/33,000, where p mean effective pressure (pounds per square inch), l length of piston stroke (feet), a net area of piston (square inches), and n number of cycles completed per minute.

MAXIMUM WORKING AREA

[INDENG] That portion of the working area that is readily accessible to the hands of a worker when in his normal states that the difference between the specific heat of a gas at constant pressure and its specific heat at constant volume is equal to the gas constant divided by the molecular weight of the gas.

BYPASS VALVE

A valve mechanism that assures system fluid flow when a preselected differential pressure across is exceeded; the valve allows all or part of the flow to bypass the filter element.

DIAPHRAGM METER

A flow meter which uses the movement of a diaphragm in the measurement of a difference in pressure created by the flow, such as a force-balance-type or a deflection-type meter.

ELBOWMETER

Pipe elbow used as a liquids flowmeter; flow rate is measured by determining the differential pressure developed between the inner and outer radii of the bend by means of two pressure taps located midway on the bend.

PRESSURE GAGE

Pressure differential above or below atmospheric pressure.

INFERENTIAL FLOW METER

A flow meter in which the flow is determined by measurement of a phenomenon associated with the flow, such as a drop in static pressure at a restriction in a pipe, or the rotation of an impeller or rotor, rather than measurement of the actual mass flow.

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