1. According to the principle of measurement

Divided into speed meter and volume meter. (1) Speed-type water meter: It is installed in a closed pipeline and consists of a moving element, which is directly driven by the speed of the water flow to obtain the power speed of the water meter. Typical speed-type water meters have rotor-type water meters and screw-type water meters. Rotor-type water meters have single-bundled water meters and multi-bundled water meters. The wing-type water meter (2) Volumetric water meter: installed in the pipeline, by a number of chambers of known volume that are filled and discharged fluids one by one, and a water meter composed of a fluid-driven mechanism, or a quantitative discharge-type water meter. Volumetric water meters are generally piston-type structures.

2. According to measurement class

According to the old standard, it can be divided into A-level table, B-level table, C-level table, and D-level table. The metering level reflects the working flow range of the water meter, especially the metering performance under small flow. According to the sequence from low to high, it is generally divided into A-level table, B-level table, C-level table, and D-level meter. Their measurement performance meets the corresponding requirements of the measurement levels A, B, C, and D specified in the national standards. . After the release of the new version of the standard, the method of classification of measurement grades has become quite complex, mainly determined by various parameters such as flow rate and range ratio. In simple terms, the larger the range, the higher the measurement level.

3. According to the nominal caliber

Divided into large-caliber water meters, small-caliber water meters. According to the nominal diameter is usually divided into small diameter water meter and large diameter water meter. Water gauges with nominal diameters of 50mm and below are generally called small-caliber water meters. Water meters with a nominal diameter of 50mm or more are called large-caliber water meters. These two kinds of water meters are also sometimes referred to as civilian water meters and industrial water meters. At the same time, this method of division can also be distinguished from the form of water meter case connections. Nominal water gauges with a nominal diameter of 50 mm and below are connected with a threaded connection, and water meters with a size of 50 mm and above are used with flanges. connection. However, some special types of water meters also have a 40mm flange connection.

4. By usage

Divided into civilian water meters and industrial water meters.

5. According to the direction of installation

Speed-type water meters can be divided into horizontally mounted water meters and vertical-mounted water meters. According to the installation direction is usually divided into horizontal installation of water meters and vertical installation of water meters (also known as vertical table), refers to the installation of the flow meter parallel or perpendicular to the water level meter, in the water meter dial with "H" for horizontal installation Use "V" for vertical installation. The volumetric water meter can be installed at any position without affecting the accuracy.

6. Divided by the temperature of the medium

Divided into cold water meters and hot water meters. According to the medium temperature can be divided into cold water meter and hot water meter, water temperature 30 °C is the dividing line (1) cold water meter: medium lower limit temperature is 0 °C, the maximum temperature of 30 °C water meter. (2) Hot water meter: A water meter with a minimum medium temperature of 30°C, an upper limit of 90°C, or 130°C or 180°C. The requirements of various countries are slightly different. In some countries, the limit of cold water meters can reach 50 degrees Celsius.

7. Pressure by media

Divided into ordinary water meters and high pressure water meters. According to the pressure used can be divided into ordinary water meters and high pressure water meters. In China, the nominal pressure of ordinary water meters is generally 1 MPa. The high-pressure water meter is a type of water meter with a maximum use pressure of more than 1 MPa and is mainly used for the measurement of underground water injection and other industrial water flowing through pipelines.

8. According to whether the counter is submerged in water

Divided into wet water meter, dry water meter, liquid seal water meter. (1) Wet water meter: the water meter immersed in the counter, the glass of the watch is subjected to water pressure, and the transmission of the sensor and the counter is a gear linkage. After a certain period of use, the quality of the water will affect the clarity of the meter reading. (2) Dry type water meter: The water meter whose counter is not immersed in water. The sensor on the structure is isolated from the chamber of the counter. The glass of the water meter is not subject to water pressure. The transmission of the sensor and the counter is usually driven by magnetic steel. (3) Liquid seal water meter: The meter digital wheel used for meter reading or the whole counter is made of liquid sealed water meter with a certain concentration of glycerin, etc. The resolution in the sealed and isolated counter is not affected by the external water quality, and the rest of the structure performance is Wet water meter is the same.

9. Divided by indicator

Divided into analog, digital, analog digital combination.