Oval Gear Flow Meters

Date: 2022-Aug-Wed   


Oval gear flow meter is a type of positive displacement meter. As liquid flows through the meter, a pair of oval-shaped gears are forced to rotate by the flow of the liquid. These gears mesh together & force a finite amount of fluid through the meter.

A sensor or mechanical drive detects the rotation of the gears to determine the displaced volume of liquid. The faster the flow rate, the faster the gears turn.


Principles of Operation


The oval gear flow meter comprises oval-shaped, geared rotors that rotate within a housing of specified geometry.

Fluid differential pressure causes the inter-meshing gears to rotate, trapping a ‘pocket’ of fluid between the gear and the outer housing and subsequently emptying the fluid pocket into the downstream flow. Capillary action of the metered fluid forms a liquid seal.

Each ‘pocket’ holds a precise and known volume of fluid so counting the pocket frequency gives a measurement of the volumetric flow rate. This is typically achieved by embedding magnets in the rotors, which then actuate a reed switch or provide a pulse output as they rotate, and thus flow is measured electronically.


OVAL Gear Flow Meter Advantages

Traditional proven flow technology

Easy to install

No straight pipe runs are required so flow meters can be installed in restricted areas

Positive Displacement Oval Gear Flow Meter technology provides for several key meter advantages – the right manufacturer can provide:

High Accuracy of Reading

Excellent Repeatability

Minimal Maintenance

Suitable for numerous fluids including Water and High Viscous Fluids

Ease of Installation, No Flow conditioning

Exceptional Turn-Down Ratios

Accuracy unaffected by changes in Viscosity

No power required with pulse or mechanical register

Industrial Heavy Duty Robust Design

Output options including: Pulse, 4-20mA, Intrinsically Safe & Explosion Proof



OVAL Gear Flow Meter Limitations

Not suitable for steam or multi-phase fluids

Fluid slippage adversely affects accuracy; this varies with flow rate, differential pressure, temperature, viscosity and clearance

Not recommended for low-viscosity fluids, including water or water-like fluids (because of an increase in fluid slippage)

Accuracy adversely affected by bubbles present in fluids

The oval gear flow meter is designed primarily for use with higher-viscosity fluids, which has led to applications such as the flow metering of oils, syrups and fuels.

What kind of oval gear flow meters do we have?

Koeo Oval gear flow meter includes mechanical, electronic, and pulse out types. The diameter and connection thread type are customized. The connection diameter size is from 1/2 inch to 2 inches.  The max flow rate is up to 300lpm.


Please contact for more information.