the flow meter which used to measure lubricating oil

Lubricating oil flow meter 

Mainly dedicated lubricants meter oval gear flow meter to measure, for precise measurement of continuous or intermittent flow or transient pipe flow liquid. It is particularly suitable for flow measurement of heavy oil, polyvinyl alcohol, resins and other high viscosity media.

Flow measurement independent of the flow state of the fluid, which is due to oval gear flow meter is to rely on the indenter measured medium oval gear driven metering of rotation.
The greater the viscosity of the medium, from gear and metering space gap smaller amount leaked leak, so sticky skin greater nuclear test medium, the smaller the leakage error, to measure more favorable.
High precision measurement of oval gear flow meter is suitable for measuring high viscosity medium traffic. 
Users should match it with strainer if there is solid particles in fluid. and 
but not for fluid containing solid particles (solid particles will gear stuck, making it impossible to measure the flow).
 If the measured liquid medium which is mixed with gas,then you user should venting device.

Oval Gear Flow Meter