The Hedland HB Series of variable area flow meters is low cost yet rugged. These in-line
flow rate indicators are industrial class and are ideal for petroleum and petroleum-based
fluids. The Hedland HB Series can be used in applications in which the temperature ranges
from -20 to 400°F (continuous) and 400 to 500°F (intermittent).
Flow meters from the Hedland HB Series feature quality metal construction in aluminum,
brass, or stainless steel. The aluminum and brass models of variable area flow meters are
rated for operating pressures up to 3500 PSI/241 bar maximum with a 3:1 safety factor.
The stainless steel model is 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. You can choose from seven
port sizes from 1/4" to 3".
Applications for the Hedland HB Series Variable Area Flow Meter
- Hydraulic Fluid Power Systems
- Petroleum-based Fluids
Operating Principle
All variable area flow meters from the Hedland HB Series 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.
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- Manufactured by Hedland
- 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
- Temperature up to 500°F
- Accuracy ±2% full scale
- Repeatability ±1%
- Calibrated for 0.876 S.G.
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