Oval Gear Flow Meter

Oval gear flow meter

Overview

SBTL series oval gear flow sensor and flow meter are uniform velocity tube flow meter R&D by our company through adopting foreign technology. It has the advantages of high accuracy, wide range, low loss, easy to installation, and long-term stability, especially suit for measuring high flow volumes. It’s widely applied to measuring flow of air, air quality, smoke, coal gas, superheated stream, saturated stream, circulating water, supply water, cooling water and other low viscosity clean medium in electric power, heat supply, petrochemical industry, metallurgy and other industries.

Working principle

The section of oval flow sensor is oval. Multi pairs high and low pressure holes rank by certain rule, high pressure hole in front of inspected stem, and low pressure hole on the best front position of side fluid separation point. The boundary layer of stream is close to the surface of sensor, and low pressure point doesn't have separation effect, so this original design can greatly reduce sensor error because of fluid separation, and accurately inspect the average deviation caused by average speed of fluid, in order to get higher measurement accuracy and wider range ratio. Its work is based on law of energy conservation (Bernoulli equation) in sealed pipeline: the differential pressure and flow is a root relationship, which can be converted out the quantity of flow by measuring the differential pressure.

?P=PH-PL                

Qm=0.12645*K*D2- (p-?P)-2

?P — differential pressure KPa

Qm — mass flow Kg/h

p — density Kg/m3

D — pipe inner diameter

K — discharge coefficient

Performance feature

1.The structure is simple, without any moving and vulnerable parts, the reliability is extremely high, which is basically maintenance free.

2.Good stability, excellent repeatability: smooth oval section makes sensor hardly affected by fluid erosion wear,keep constant K factor, unnecessary to calibrate regularly, and repeatability up to ± 0.1 %.

3.Good blocking proof, static pressure hole is front of separation point of sensor two sides, and fluid flows parallel static pressure entrance, which makes smudge absolutely not easy to enter.

4.High precision, wide rang ratio, low pressure point doesn't have separation effect and vortex, making sensor also get stable differential pressure even small quantity of flow and keep constant K factor in a wide range. Measurement accuracy can be up to ± 1 % ; range ratio to 17:1.

5.Energy saving effect is the best, special designs of oval section hardly generate vortex and noise, reducing loss of pressure by a large margin which is 1 % of differential pressure.

6.Low requirement to straight pipeline: generally front 5 behind 3, installing sensor at 2D behind single elbow also can guarantee the measurement accuracy.

7.Small demission, little weight, it is very convenient to transport, install and maintain, which

8.greatly saves those charges.

9.Inserting type can install and maintain online, suitable for many important long-time work but unable to stop conditions, guarantee stability and safety of device system, and reduce loss because of stopping.

10.Material of sensor should be 316L or other special one, like suitable for 500°C high temperature and pressure.

11.High and low pressure cavity is intergrated, high strength, the highest pressure up to AN25 00#.

12.Wide pipe diameter range, from DN50 to DN6000.

13.Flange standards: chemical industry HG20592-97, or GB, JB/T, ANSI, DIN and so on.

Selection of reference