Skip to main content

Oval Gear Flow Meter Working Principle

Oval gear meters are traditional, mechanical, positive displacement (PD) flow meters, first invented more than 50 years ago by OVAL Corporation of Japan and now widely used for flow metering applications.

Oval gear meters measure flow by employing a geared rotor to pass known volumes of a fluid through a housing.

Oval Gear Meter

A very precisely adjusted gear pair within the casing forms the measuring element. The in flowing medium causes the gear pair to rotate. The rotary motion is scanned by contactless sensors. Since each individual tooth generates a pulse, this results in a very high resolution.

Consequently, even the smallest volumes can be measured or dosed precisely. The measurement unit contains two pick-offs that are circumferentially offset by ? of a tooth pitch to generate a 2 channel flow-proportional frequency signal.

Suitable processing of the signal provides an greater resolution and the option to identify the flow direction. Basically, the measurement accuracy increases with increase in viscosity of the media.

The oval gear flow meter comprises oval-shaped, geared rotors which rotate within a housing of specified geometry. Fluid differential pressure causes the intermeshing 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.


OVAL Gear Meter Advantages
*Traditional proven flow technology
*Simple to install
*No straight pipe runs required so flow meters can be installed in restricted areas

OVAL Gear 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

Applications:
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.


Labels:

Comments

  1. siddhagirimetalDecember 1, 2021 at 9:07 PM


    Thanks for sharing the best information and suggestions, If you are looking for the best inconel pipe suppliers, then visit Siddhagiri Metals & Tubes. Highly energetic blog, I’d love to find out some additional information.

    ReplyDelete
  2. oshwinDecember 6, 2021 at 2:26 AM

    I found your blog on Google and read a few of your other posts. I just added you to my Google News Reader. You can also visit stainless steel pipe dimensions for more Oshwin Overseas related information and knowledge, Keep up the great work Look forward to reading more from you in the future.

    ReplyDelete
  3. greatmetalDecember 6, 2021 at 2:50 AM

    Hello there, this is the fantastic post and I am very inspire from it, the title and the contents which are in the mid are really share worthy and have value. But there is lack of some useful tips for that I would like to share a website which completely full of useful information on related topic. If you are looking for the best Duplex Flanges then visit Great steel & metals. Keep sharing more.

    ReplyDelete
  4. rexaltubesDecember 6, 2021 at 3:00 AM

    Hi there to everybody, it’s my first go to see of this web site; this weblog consists of awesome and in fact good stuff for visitors. Hurrah, that’s what I was exploring for, what stuff! Existing here at this blog, thanks admin of this web site. You can also visit x65 pipe for more Rexal Tubes related information and knowledge.

    ReplyDelete
  5. rpfindiaDecember 6, 2021 at 10:46 PM


    This blog is really helpful to deliver updated educational affairs over internet which is really appraisable. I found one successful example of this truth through this blog. I am going to use such information now. Visit sstainless steel 304 pipe fittings for more related information and knowledge.

    ReplyDelete
  6. UnknownDecember 20, 2021 at 11:33 PM

    Really nice and interesting post. I was looking for this kind of information and enjoyed reading this one. ss pipes and fittings

    ReplyDelete

Post a Comment

Popular posts from this blog

PLC Program for Mixing Tank

 Create a ladder diagram for controlling a batch mixing process. Implement a PLC program for mixing tank or Mixing Process using PLC Ladder Logic. PLC Program for Mixing Tank Fig : Mixing tank A tank is used to mix two liquids. The required control circuit operates as follows: A. When the START button is pressed, solenoids A and B energize. This permits the two liquids to begin filling the tank. B. When the tank is filled, the float switch trips. This de-energizes solenoids A and B and starts the motor used to mix the liquids together. C. The motor is permitted to run for 1 minute. After 1 minute has elapsed, the motor turns off and solenoid C energizes to drain the tank. D. When the tank is empty, the float switch de- energizes solenoid C. E. A STOP button can be used to stop the process at any point. F. If the motor becomes overloaded, the action of the entire circuit will stop. G. Once the circuit has been energized, it will continue to operate until it is manually stopped. Solution...
1 comment
Read more

What is Relay? How it Works? Types, Applications, Testing

 We use relays for a wide range of applications such as home automation, cars and bikes (automobiles), industrial applications, DIY Projects, test and measurement equipment, and many more. But what is Relay? How a Relay Works? What are the Applications of Relays? Let us explore more about relays in this guide. What is a Relay? A Relay is a simple electromechanical switch. While we use normal switches to close or open a circuit manually, a Relay is also a switch that connects or disconnects two circuits. But instead of a manual operation, a relay uses an electrical signal to control an electromagnet, which in turn connects or disconnects another circuit. Relays can be of different types like electromechanical, solid state. Electromechanical relays are frequently used. Let us see the internal parts of this relay before knowing about it working. Although many different types of relay were present, their working is same. Every electromechanical relay consists of an consists of an Elect...
1 comment
Read more

Chlorine dioxide Analyzer Principle

 Chlorine dioxide measurement Chlorine dioxide (ClO2) is an instable, non-storable, toxic gas with a characteristic scent. The molecule consists of one chlorine atom and two oxygen atoms – represented in the chemical formula ClO2. It is very reactive. To avoid the risk of spontaneous explosions of gaseous chlorine dioxide or concentrated solutions, it is generally handled in dilution with low concentrations. ClO2 is soluble in water, but tends to evaporate quickly. Typically it is prepared on site, for example from hydrochloric acid and sodium chlorite. The procedure provides solutions with approx. 2 g/l ClO2 that can be safely handled and stored for several days. Image Credits : krohne Sensor Parts : Reference electrode Applied chlorine dioxide specific potential Current needed to maintain the constant potential Counter electrode Measuring electrode The disinfection effect of ClO2 is due to the transfer of oxygen instead of chlorine, so that no chlorinated byproducts are formed. C...
6 comments
Read more