The rotary piston fuel flow meter belongs to the positive displacement flow meter. It is based on a measuring element piston that maintains a tangential sealing state between the piston and the measuring chamber, and has a fixed eccentricity. Under the pressure difference of the fluid, the piston generates a rotational force distance, causing the piston to perform eccentric rotational motion. The number of revolutions of the piston is proportional to the flow rate of the fluid. By recording its number of revolutions through a counting mechanism, the fluid flow rate can be measured.

The rotary piston fuel flow meter is a flow meter designed and produced using Japanese advanced technology, which can measure heavy diesel fuel; Crude oil; The total amount of heavy oil and petroleum media that meet viscosity requirements flowing through the pipeline has the advantages of reliable operation, low pressure loss, and high accuracy.

When the instrument leaves the factory, it is adjusted to within the accuracy range. However, due to long-term use and improper installation, errors may increase. Therefore, the instrument should be calibrated regularly (once every one or two years). The adjustment error gear is not included at the factory. If the instrument needs to be corrected, please contact our factory to replace the gear in order to improve and ensure the accuracy of the instrument.

The rotary piston flowmeter consists of two parts: a measuring mechanism and a counting mechanism.
Measurement institutions include: main body, measuring components (pistons, etc.), and transmission mechanism
The measuring component is composed of a rotating piston, a partition plate, an eccentric wheel, etc. The partition plate is located in the radial plane, and there is a fixed eccentricity between the piston and the center of the measuring chamber. The inner and outer walls of the piston are always tangent to the measuring chamber, dividing the oil chamber into two parts.
The rotation of the piston is transmitted to the counting mechanism through a magnetic coupling, and the connecting part is sealed with a copper sleeve and a sealing ring to ensure the sealing of the instrument.
The counting mechanism of the instrument is composed of a gear reduction mechanism and a mechanical eight digit counting wheel.
A tooth adjustment mechanism is installed between the measuring mechanism and the counting mechanism to adjust the error of the instrument during calibration.

The flow meter and matching oil filter must be installed in a place that is free of corrosion, dust, vibration, pressure fluctuations, and easy to install, inspect, and maintain, and must have moisture-proof and rainproof measures.
Freezing of the measured liquid can damage the flowmeter, therefore, any flowmeter installed outdoors must have insulation measures.
Flow meters should be installed on pressure pipelines as much as possible, so that the measured liquid still fills the measuring chamber during equipment shutdown.
Before installation, the pipeline must be thoroughly flushed to remove any dirt and impurities left inside.
The flowmeter must be installed horizontally (i.e. with the dial in a horizontal position) in conjunction with the oil filter. When installing, attention should be paid to the fluid flow direction, which should be in the direction indicated by the arrow on the flowmeter body. In order to maintain the flow meter and clean the oil filter without stopping the operation of the process equipment, auxiliary pipelines should be installed, as shown in the installation diagram below.

installation diagram

After installation, the inflow and outflow valves should be closed, and then the bypass valve should be opened to allow fluid to flow through the bypass first. After sufficient flushing, slowly open the inflow and outflow valves, and then close the bypass valve.
The flow meter should be started at a lower flow rate, and the counter should be checked for flexible rotation before increasing the flow rate to the maximum possible, so that residual air inside the meter can be carried away.
The pressure, temperature, viscosity, and accuracy must be specified for this instrument. Used within the flow range.

When using a rotary piston flowmeter, attention should be paid to the characteristics of the measured liquid, such as temperature, pressure, viscosity, flow range, etc., to ensure compliance with the instrument specifications. Regularly check and clean the oil filter during use, and clean the filter screen every 500 hours of operation.