Volumetric water meters
Positive displacement meter is also called the piston meter, is a kind of fixed displacement meter, volumetric water meter in the national standard is defined as "installation in closed pipes by some successive filled with fluid of known volume capacity and discharge chamber and with the fluid drive mechanism of a kind of water meter" positive displacement meter has rotary piston and disc type two big series, when the water flow through the meter, The amount of water flowing through the meter is known by the number of times the piston disc is rotated by the current. The most vivid analogy is to the kind of turnstile in front of a large supermarket or hotel, which can only rotate in a fixed direction. Every time a certain Angle is turned, the fluid will go to the other side through the water meter. So the volumetric water meter is more accurate than the speed meter. The measurement error of velocity water meter will be ±2% according to the different velocity of the fluid, while the error of volumetric water meter can be controlled at ±0.5% or even lower.
In terms of use, volumetric water meter is generally used in seiko enterprises or test and other places because of its accurate measurement effect; The speed meter is generally used for normal life and industrial water.
In terms of price, volumetric water meters are generally much more expensive than speed water meters.
Piston type volumetric water meter is generally small caliber, mainly used for pure water and other measurement accuracy requirements of the flow metering work, better water quality; The speed meter is suitable for all kinds of caliber, mainly used for general tap water metering. The flexibility requirement is relatively low, the application scope is large.