Advantages of piston water meter test bench

　The liquid flow standard device is widely used in the experiment and verification device of liquid flow meter, especially for flow meter manufacturers, there are a large number of instrument verification work and product development experimental work, a set of efficient and reliable liquid flow standard device is produced. Activities are important. In industrial applications, the flow standard device should not only have sufficient accuracy and reliability, but also have a relatively high verification efficiency. Factors such as the construction cost of the device, the operating cost, and the technical requirements of the operator should also be considered.

　　The traditional liquid flow standard devices are mostly standard devices based on the mass method and the volume method. There are two ways to generate the flow source. One is the high-level water tower. The first is to rely on the water pump to provide flow, but the flow is pulsating, the flow stability is poor, and the flow point adjustment is not accurate, but with the rapid development of flow measurement and testing technology, these devices can no longer meet the requirements well. In order to meet the requirements of liquid flow meter verification, calibration, factory inspection and the growing trend of new flow meter production, our company has designed and manufactured an active piston liquid flow standard device with water as the medium. The standard device has a unique design and its basic working principle It is to compare the volume flow of the fluid discharged by the piston with the volume flow of the flowmeter under test in a certain time interval. The volume of the fluid discharged by the piston is obtained by the product of the cross-sectional area of ​​the piston cylinder and the displacement of the piston. Driven by the servo motor to reduce the disturbance to the liquid flow, it has many advantages such as stability and reliability, good repeatability, high degree of automation, and easy operation, avoiding the shortcomings of the start-stop effect or the commutator effect of the traditional liquid flow standard device. It is beneficial to improve the measurement uncertainty level. The device also has the characteristics of self-contained, compact structure, high efficiency and energy saving, no need to build a pool, no need to put forward special structural requirements for the building, and it is very suitable for production testing and product development testing of small flow metering instruments.