The Hedland Water and Other Fluid Flow Meters are low cost, yet rugged variable area flow meters. These in-line flow rate indicators are industrial class and can be used in high temperature water and other fluids. These Hedland flow meters feature quality metal construction in brass or stainless steel. You can choose from six port sizes from 1/4" to 3".

These variable area flow meters can be used in applications in which the temperature ranges from -20 to 240°F. The stainless steel flow meters are pressure rated for 6,000 psi/414 bar maximum (5,000 psi/345 bar maximum for 3/4" to 1 1/2" sizes) with a 3:1 safety factor. The brass flow meters are pressure rated for 3,500 psi/241 bar maximum with a 3:1 safety factor.

All Hedland variable area flow meters use a sharp-edged annular orifice, formed between the open-centered piston and a contoured metering cone. The piston is held in a "no flow" position at the base of the contoured cone by a calibrated retention spring. Flow through the meter creates a differential pressure across the piston orifice, moving the piston against the spring. The greater the volume, the further the piston moves. Externally, the flow indicator is magnetically-coupled to the moving piston. The indicator is visually "read" against a graduated flow scale. Features include direct reading, install in any position, 360° rotatable guard/scale, easier-to-read linear scale, and repeatability of ±1%.