Starting at $241.00
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  • 240°F max.
  • ±2% full scale accuracy
  • ±1% Repeatability
  • Special scales available
  • Calibrated for 1.18 S.G.
  • Aluminum, brass or SS body
  • 6,000 psi (414 bar) maximum
  • 0.02-0.2 GPM up to 10-150 GPM
  • (0.1-0.75 LPM to 50-560 LPM)
  • 1/4 to 1-1/2 inch ports


The Hedland High Pressure Flow Meter for Phosphate Ester Fluids is a rugged, low cost variable area flow meter. These industrial class in-line meters are design to be used for phosphate-ester fluid measurement. The meters features high quality metal body construction in brass, stainless steel, or anodized aluminum. You can choose from six port sizes from 1/4" to 1-1/2" with flow ranges from 0.02 to 150 GPM (0.1 to 560 LPM).

These variable area flow meters can be used in applications in which the temperature ranges from -20 to 240°F. 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" series) with a 3:1 safety factor. Aluminum and brass meters are pressure rated for 3,500 psi/241 bar maximum with a 3:1 safety factor.

Operating Principle

All Hedland variable area 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.

Applications for the Hedland High Pressure Flow Meter for Phosphate Ester Fluids:

  • Hydraulic Fluid Power Systems
  • Phosphate-Ester Fluids


  • Direct reading
  • Install in any position
  • 360° rotatable guard/scale
  • Easier-to-read linear scale
  • No flow straighteners or special piping required
  • Relatively insensitive to shock and vibration
  • Good viscosity stability


This product can be used in the following applications: