VROG Oval Gear Flowmeter
Typical Application:
The elliptical gear flowmeter is a volumetric flowmeter mainly used to measure high viscosity media. It has been widely used in petroleum, petrochemical, natural gas, chemical, paper and other industries to measure small flowmeters of small diameters.
Main Advantages:
Diameter is from 10 to 150 mm;
There are many kinds of shell materials to choose from: aluminum, stainless steel and medium and high pressure stainless steel, PPS, bronze, etc.
There are many kinds of bearing materials: ceramic, bronze, Hastelloy, carbide, PPS, stainless steel, etc.
The material of the shaft: 316 stainless steel;
O-ring material is available in VITON, fluoro rubber, stainless steel and Teflon;
The range ratio is 10:1, and the maximum is 50:1;
Accuracy is ±1% or ±0.5%;
Repeatability is±0.03%;
Straight pipe section required for installation: 5D+3D, filter is required;
Viscosity up to 1,000 000CP;
Pressure rating up to 551bar;
Temperature resistance range is within -10 - +60°C
Technical Performance:
1. Specification:
| Model | Diameter(mm) | Min. Flowrate (m3/h) | Max. Flowrate (m3/h) | Accuracy | Working Pressure (MPa) |
| VROG - 8 | 8 | 0.04 | 0.4 | 0.5%, 0.2% | 1.6, 2.5, 4.0, 6.4 |
| VROG - 15 | 15 | 0.16 | 1.5 | ||
| VROG - 20 | 20 | 0.3 | 3 | ||
| VROG - 25 | 25 | 0.6 | 6 | ||
| VROG - 40 | 40 | 1.5 | 15 | ||
| VROG - 50 | 50 | 2.4 | 24 | ||
| VROG - 80 | 80 | 6 | 60 | ||
| VROG - 100 | 100 | 10 | 100 | ||
| VROG - 150 | 150 | 12 | 120 |
2. Features:
The flow measurement is independent of the flow state of the fluid because the oval gear flow meter is metered by the rotation of the elliptical gear by the indenter of the measured medium. The larger the viscosity of the medium, the smaller the leakage amount from the gear and the metering gap, so the larger the stickiness of the nuclear medium, the smaller the leakage error, and the better the measurement. The elliptical gear flow meter has high metering accuracy and is suitable for the measurement of high viscosity medium flow, but it is not suitable for fluids containing solid particles (solid particles will jam the gears, so that the flow cannot be measured). If the liquid to be tested is contaminated with gas, it will also cause measurement errors. The oval gear flowmeter is a type of volumetric flowmeter for precise continuous or intermittent measurement of the flow or instantaneous flow of liquid in a pipe. It is especially suitable for flow measurement of high viscosity media such as heavy oil, polyvinyl alcohol and resin.
3. Working principle:
The working principle of the oval gear flowmeter is that the measuring part of the elliptical gear flowmeter is mainly composed of two intermeshing oval gears and the part of the inner wall of their casing (metering chamber), as shown in the following figure.
4. Model Selection Table
| Model | 1 | 2 | 3 | 4 | 5 | 6 | Meaning |
| Nominal Diameter | Counter | Nominal Pressure | Material | Transmitter | Working Temp. | ||
| VROG - | Over gear flowmeter | ||||||
| 8 | Nominal diameter is 8mm | ||||||
| 15 | Nominal diameter is 15mm | ||||||
| 25 | Nominal diameter is 25mm | ||||||
| 40 | Nominal diameter is 40mm | ||||||
| 50 | Nominal diameter is 50mm | ||||||
| 80 | Nominal diameter is 80mm | ||||||
| 100 | Nominal diameter is 100mm | ||||||
| 150 | Nominal diameter is 150mm | ||||||
| W | Pulse transmission without transmitting head | ||||||
| J | Mechanical counter | ||||||
| E | Electronic counter | ||||||
| H | Zero returnable counter | ||||||
| 1.6 | Nominal pressure is 1.6Mpa | ||||||
| 2.5 | Nominal pressure is 2.5 Mpa | ||||||
| 4.0 | Nominal pressure is 4.0 Mpa | ||||||
| 6.3 | Nominal pressure is 6.3 Mpa | ||||||
| C304 | Rotor material is stainless steel 304 | ||||||
| C316 | Rotor material is stainless steel 316 | ||||||
| CC304 | Material of casing and rotor is S. S. 304 | ||||||
| CC316 | Material of casing and rotor is S. S. 316 | ||||||
| F | Pulse output | ||||||
| I | Current output | ||||||
| A | Working temperature range: -20 - +80℃ | ||||||
| B | Working temperature range: -20 - +150℃ | ||||||
| C | Working temperature range: -20 - +250℃ | ||||||
