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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.

### Related questions

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