Product Description
LC OVAL GEAR FLOWMETER- Mechanical fuel flow meter
Oil Oval Gear Positive Displacement (PD) Flowmeters
Oval wheel flow-meters(High Viscosity Oval Gear Flowmeters)
1. General Description
High accuracy positive displacement flowmeter for wide range of fluids including water, petroleum, solvent. The mechanical counter allows checking of total flowrates in the field. Output furnished flowmeter is also available optionally.
Tianjin U-ideal Instrument oval flowmeter is suitable for viscous oils, ranging from hydraulic to light gear oils, eliminating any problems associated with changes in viscosity during operation. It also provides the advantage of positive displacement technology at a rotameter price. This flowmeter has a cost-effective design allowing for stress-free maintenance. The only wearable components are the oval gears and their axles, allowing the two-step rebuilding process to be easily accomplished in minutes with no necessary recalibration.
2. Structure and Operation Principle
U-ideal 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 makes 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 electrical indicator for remote integrated flow and instantaneous flow indication and control.
3. Technical Specification
Nominal operating pressure ….. 1.6~42MPa
Norminal diameter:……… 8~300mm
Counter:………… …. mechanical counter or electronic counter
High accuracy: …………… ±0.5% RD (Option: ±0.2% RD)
Viscosity: ……………… 0.3~200MPas or 0.3~1000MPas
Temperature: …………. 0~60 or -20~+300°C (environment: -20~+70°C)
Material: …………… Cast Iron, Cast steel, SS316 or other material on order
Pressure drop:………… 0~1000Mpas<80kpa
Flow range……………. See table
| Shell and cover | cover plate | oval wheel | Rotary shaft | Sheath of shaft | Nominal pressure(MPa) | |
| LC-A | Cast steel | Cast iron | Stainless steel | Bronze(with oil) or rolling bearing | 1.6 | |
| LC-E | Cast steel | Cast ironStainless steel | Under DN50 6.3 DN80-100 4.0 DN150-200 2.5 |
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| LC-Q | Cast iron | Cast iron | Alloy aluminum, engineering material | graphite | 1.6 | |
| LC-BC | Stainless steel | Stainless steel | Stainless steel | graphite | 1.62.5 | |
| LC-L | Cast aluminum |
Cast iron, Stainless steel |
Alloy aluminum, engineering material |
Bronze(with oil)graphiterolling bearing | 1.6 | |
| Notes:1. OCr18Ni12Mo2Ti for type LC-C;OCr18Ni9Ti 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. |
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……………..
| ype | DN | Viscosity (MPa. s) | |||||||||
| <0.3 | 0.3~0.8 | 0.8~2 | 2~200 | 200~1000 | 1000~2000 | ||||||
| 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 | Flow Range unit:m 3 /h |
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| LC-15 | 15 | 0.75-1. | 0.3-1.5 | 0.3-1.5 | 0.15-1.5 | 0.2-1.0 | 0.1-1.05 | 0.07-0.75 | |||
| LC-20 | 20 | 1.5-3 | 1-3 | 0.4-3 | 0.5-3 | 0.3-3 | 0.4-2.1 | 0.2-2.1 | 0.15-1.5 | ||
| LC-25 | 25 | 4-6 | 3-6 | 2-6 | 0.8-6 | 1-6 | 0.6-6 | 0.8-4.2 | 0.4-4.2 | 0.3-3 | |
| LC-40 | 40 | 9-15 | 7.5-15 | 5-15 | 2-15 | 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 | 3-24 | 4.8-24 | 2.4-24 | 2.4-16.8 | 1.6-16.8 | 1.2-12 | |
| LC-B4050 | 4050 | 8-20 | 6-20 | 6-20 | 4-20 | 4-20 | 2-20 | 2.8-14 | 1.4-14 | 1.0-10 | |
| LC-B65 | 65 | 27-40 | 20-40 | 15-40 | 5-40 | 8-40 | 4-40 | 5.6-28 | 2.8-28 | 2-20 | |
| LC-80 | 80 | 40-60 | 30-60 | 20-60 | 8-60 | 12-60 | 6-60 | 8.4-42 | 4.2-42 | 3-30 | |
| LC-100 | 100 | 67-100 | 50-100 | 34-100 | 13.-100 | 20-100 | 10-100 | 14-70 | 6-70 | 5-50 | |
| LC-150 | 150 | 38-120 | 38-120 | 40-120 | 12-120 | 24–120 | 12-120 | 15-100 | 10-90 | 16-80 | |
| LC-200 | 200 | 227-340 | 170-340 | 114-340 | 43-340 | 56-340 | 34-340 | 47.6-238 | 23.8-238 | 17-170 | |
| LC-250 | 80~500 | 150~450 | |||||||||
| Accuracy class | 0.5 | 0.5 | 0.2 | 0.5 | 0.2 | 0.5 | 0.2 | 0.5 | 0.5 | ||
| Note | “gal/h” could be special ordered. | ||||||||||
……………..
| Model | Nominal Diameter(mm) | Flow Rate(m³ /h) | Unit Pulse(mL/P) |
| LC-15 | 15 | 0.18-1.8 | 9 |
| LC-20 | 20 | 0.25-2.5 | 10.48 |
| LC-25 | 25 | 0.6-6 | 18.24 |
| LC-40 | 40 | 1.5-15 | 31.5 |
| LC-50 | 50 | 2.4-24 | 80.6 |
| LC-80 | 80 | 5-50 | 148.7 |
5. Installation and usage
1) Follow the right flow direction on flowmeter body. And make it easy reading.
Chart 4: position of installation
2) The flowmeter should be installed in the normal temperature place where no harmful gas and strong heat radiation to protect the flowmeter.
3) The oval gear axis shall be in level position i.e.the dial shall be installed to the vertical position (graduation “0” shall be on the top) to decrease confriction between oval gear and carcase and abrasion of spare parts. To be convenient for reading, the counter can be rotate to 90 degree or 180 degree according to the different installation position.
4) The pipes shall be completely washed before installation of flowmeter. The filter shall be installed upstream of flowmeter if filter no filter available to avoid impurity to the flowmeter.
5)
The flowmeter shall be installed at the side of the pump’s outlet while the flow regulating valve at the backward position of the flowmeter First open the stop valve at the upper side, then open the flow regulating valve or stop valve slowly at the backward position, it is strictly prohibited to open or close suddenly.
Chart 5: position of installation
1. Error Adjustment
Error E=
1) The standard of double layer gear designed is 38/35. If it is found the flowmeter runs fast when checking, it means “+” errors occurred. For example +1.02 -+0.3% ( average error is +0.66%). The error of standard double layer gear 38/35 shall be treated as ‘0’ and adjust 0.66% lower. Referring to the error registration chart, replace the gears with the corresponding double layer. Take the nearest value 0.62%, replace double layer gear 41/38 to decrease error to +0.4%~-0.32% which is within the qualified scope.
2) Precision of flowmeter will be changed owing to gears’abrasion during usage and lead to ultra-error. It can be adjusted up to garde if error range is less than 1 %. For example, if precision of meter declined to + 0.22% 0.64% (average error is – 0.21 %), first check number of teeth of original double gear. If it is 38/35, adjust as the above No.l. If it is 41/38 gear, corresponding error +0.62% shall be treated as 0, raise 0.21% to make error decline 0.21% and change into 0.41%. Referring to the error registration chart, replace 40/37 double layer gear. (Its error is 0.43% and it is most similar to 0.41%). The actual error will decline 0.19% after adjustment. Precision of meter is +0.41–0.45% within qualified scope.
3) Means to verify and adjust Grade 0.2 oval gear flowmeter is same as above item 1, item2.
4) Take off housing ( in chart 2 and chart 3 ) first and loose axle sleeve at the back of it (See chart 6, same below ) and nuts ,, replace and adjust gear, then turn adjusting board to make adjusting gear and driving gear,to joggle correctly, tighten axle sleeve and nuts.