General Description
Oval meters are instruments used for the continuous and intermittent measurement and control of the pipe liquid flow, which are typical of positive displacement meter, feature large flow range, low pressure loss, large viscosity range, easy installation, high accuracy and can measure high temperature, high viscosity liquids with easy calibration.
Type LC oval meters are fitted with on-site pointer indication and roller integration device which can indicate the liquid flow and intermittent flow passing through the pipeline. For the different liquids (acid, alkali, salt, organic solution etc.), the meters can be made of different materials (cast iron, cast steel, stainless steel etc.) . The meters are widely used for the flow measurement in the field of petroleum, chemical, chemical fibre, traffic, food industries and commerce, medical and sanitary departments.
Structure and Operation Principle
Oval meter is generally comprised of a flow transducer and a counter mechanism. The main part of the transducer is a measuring chamber which consists of a pair of oval wheels and a sealing coupling. The counter mechanism contains speed reduction gears, adjusting device, counter, and pulse transmitter etc.
In the measuring chamber, a pair of oval wheels and cover plate make a crescent shape cavity which is used as a measuring unit.The oval wheels are rotated by the pressure difference in the inlet and outlet of the meter and drive the inlet liquid through the cavity to the outlet, each revolution of the oval wheels displaces fluid four time the volume of the cavity, the total revolutions of the oval wheels and the revolution rate will be transferred to the mechanical counter, and the total liquid volume and instantaneous flow will be known by the pointer display and the roller integration. The attached signal generator converts the rotary axial angular shift to the pulse signal and then transmits it to the customer’s electrical indicator for remote integrated flow and instantaneous flow indication and control.
General Technical Specification
1.Materials of main parts and the nominal operating pressure
Shell and cover | cover plate | oval wheel | Rotary shaft | bushing | Nominal pressure（MPa） | |
LC-A | Cast steel | Cast iron | Cast iron、Stainless steel Alloy aluminum, engineering material
| Stainless steel | Bronze(with oil) or rolling bearing | 1.6 |
LC-E | Cast steel | Cast iron | Under DN50 6.3 DN80-100 4.0 6.3 DN150-200 2.5 | |||
LC-Q | Cast iron | Cast iron | Bronze(with oil) or rolling bearing ，graphite | 1.6 | ||
LC-L | Cast aluminum | Cast iron、Stainless steel | graphite | 1.6、2.5 | ||
LC-B、C | Stainless steel | Stainless steel | Stainless steel | Bronze(with oil)、graphite、rolling bearing | 1.6 | |
Notes:1. 0Cr18Ni12Mo2Ti for type LC-C； 0Cr18Ni9Ti for type LC-B。 2. Flange is convex under 2.5MPa ,and roughness at 6.3 MPa;and both of the above at 4.0 MPa。 | ||||||
2.Accuracy class class 0.5,class 0.2
3.Operating temperature: series LC－A(-20℃~+60℃)，series LC-B、E、L(-41℃~+60℃)
60℃～200℃(with high temp. radiator installed)
LC-Q、L: -20℃～+60℃;
4 Explosion-proof mark: ExiaⅡCT5, dⅡBT4
5. Flow range: unit: m3/h
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Type | DN | Viscosity (mPa. s) | ||||||||
<0.3 ＜0. | 0.3~0.8 0. | 0.8~2 | 2~200 | 200~1000
| 1000~2000
| |||||
LC-10Ⅱ | 10
| 0.08-0.25
| 0.1-0.25 | 0.05-0.25 | 0.08-0.25 | 0.05-0.25
| 0.03-0.05 | 0.02-0.05
| ||
LC-10 | 10
| 0.2-0.5
| 0.08-0.5 | 0.08-0.5 | 0.05-0.5
| 0.06-0.3 | 0.03-0.3
| 0.03-0.2
| ||
LC-15 | 15
| 0.75-1. 5 | 0.3-1.5 | 0.3-1.5 | 0.15-1.5 0.3-3 | 0.2-1.0 | 0.1-1.05
| 0.07-0.75
| ||
LC-20 | 20
| 1.5-3
| 1-3 | 0.5-3 | 0.5-3 | 0.3-3 1.5-15 | 0.4-2.1 | 0.2-2.1
| 0.15-1.5
| |
LC-25 | 25
| 4-6
| 3-6
| 2-6 | 1-6 | 1-6 | 0.6-6 1.56-15 | 0.8-4.2 | 0.4-4.2
| 0.3-3
|
LC-40 | 40
| 9-15
| 7.5-15
| 5-15 | 2.5-15 | 2.5-15 | 1.5-15
| 2.1-10.5 | 1.0-10.5
| 0.7-7.5
|
LC-50 | 50
| 10-24
| 8-24
| 8-24 | 4.8-24 | 4.8-24 | 2.4-24
| 2.4-16.8 | 1.6-16.8
| 1.2-12
|
LC-B40、50 | 40、50 | 8-20 | 6-20 | 6-20 | 4-20 | 4-20 | 2-20 | 2.8-14 | 1.4-14 | 1.0-10 |
LC--65 | 65
| 27-40
| 20-40
| 15-40 | 8-40 | 8-40 | 4-40
| 5.6-28 | 2.8-28
| 2-20
|
LC-80 | 80
| 40-60
| 30-60
| 20-60 | ||||||
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