Show Menu

Common Types of Hydraulic Flow Meters Cheat Sheet by

Common types of hydraulic flow meter
fluid     meter     common     flow     types     hydraulic

Introd­uction: What is flow?

Flow is the measur­ement of the volume of a liquid that passes a fixed point in a unit of time. For most hydraulic applic­ations, flow is measured in liters per minute (lpm), U.S. gallons per minute (US gpm), or, occasi­onally, U.K. gallons per minutes (UK gpm).

Multiply By To obtain
US gpm 3.785 lpm
UK gpm 4.546 lpm

Flow Meter

What to consider when selecting a flow meter?

When searching for a flow meter for use in a particular hydraulic applic­ation, these five questions can help:
1. What are the fluid proper­ties?
2. What are the hydraulic system operating condit­ions?
3. Why is flow being measured; how accurate does the flow measur­ement need to be?
4. What effect might the flow meter have on the fluid and vice-v­ersa?
5. How important is it to measure flow; what is your budget?

Variable orifice flow meters

The idea of flow displacing an object, usually a piston or a ring, forms the basis of simple ‘variable orifice’ flow meters. The momentum of the fluid exerts a force on a piston that is held in place by a spring. Such meters typically have an accuracy of between 2 – 5% of full scale

Gear type flow meters

These are positive displa­cement flow meters. On the inside, they look similar to a gear-type motor. Fluid passes around the outside of a pair of interm­eshed gears, rotating the gears on their shafts. A transducer mounted above one of the gears generates a pulse each time a gear tooth passes under it. The rotation of the gears is propor­tional to the flow rate. Sometimes, two transd­ucers are used to measure direction and improve resolution

Turbin­e-type flow meters

In a turbin­e-type flow meter, a turbine rotor is mounted on a shaft between two sets of flow straig­hte­ners. The fluid passes through the flow meter and rotates the turbine blade. As for a gear-type flow meter, a transducer is mounted above the turbine and generates a pulse each time a blade passes under it. The frequency from the transducer is propor­tional to the flow over a limited range.

Other Meter Types

Oval gear meters are similar to conven­tional gear meters, but use two elliptical gears that rotate together at 90º to one another inside a housing. The fluid is swept around the chamber by the gears, and the frequency of rotation is directly related to the volume of fluid through the meter.

Download the Common Types of Hydraulic Flow Meters Cheat Sheet

1 Page

PDF (recommended)

Alternative Downloads

Share This Cheat Sheet!



No comments yet. Add yours below!

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.

          Related Cheat Sheets

          Weights and Measures Cheat Sheet
          Hydraulic Flow Meters Cheat Sheet
          JSON Cheat Sheet

          More Cheat Sheets by Davidpol

          CMS F-Tags and Regulatory Groups Cheat Sheet
          What to Ask Your Doctor Cheat Sheet
          Red Flags Your Child is Becoming an Addict Cheat Sheet