ITRON flowmeter | What are the well-known brands and manufacturers of imported pressure reducing valves

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Which brand of imported pressure reducing valve is better?

Whether the imported pressure reducing valve is good or not mainly depends on the accuracy of the pressure reduction balance and the performance of the voltage stabilization.; Pressure reducing valve is a type of valve product with relatively high requirements; If it is a domestically produced pressure reducing valve for water use, it can also be used, such as the DeTaiKe brand in Beijing; If it is a steam pressure reducing valve and a gas pressure reducing valve, they are generally imported; For example, which brand of imported pressure reducing valve is better between the UKs Speisak and the USs Weidun VTON depends mainly on the product type. For example, for water pressure reducing valves, the better brands include the USs Tyco, the USs Yuanlan Weidun VTON, and the German Lite; If it is a steam pressure reducing valve, the main ones are Speisak from the UK, VTON from the US, and Armstrong from the US; If it is a gas pressure reducing valve, there are mainly American Weidun VTON, American Jierui, and Japanese Yaoxi Dakai;

2. How to calibrate a flowmeter (split/integrated volume correction instrument)? The instrument calibration of flow meters (split/integrated volume correction instruments) requires calibration of pressure, temperature, and flow modules according to the equipment type (split or integrated) and specific technical parameters to ensure accurate sensor data and meet calculation requirements. The following is the specific calibration process:

1. Calibration of split volume correction instrument (Elster EK220/230/260, ITRON CORUS) Pressure calibration technical requirements: calibration range of 0.5-4MPa (absolute press

ure), uncertainty level of 0.1, only verifying 3 points of the upward stroke (such as 0.5MPa, 2MPa, 4MPa). Process: Confirm interface type (M141.5 or M201.5, EK series requires confirmation of sealing type). Connect a standard pressure source (such as a high-precision pressure gauge) to the calibrated equipment, apply pressure point by point, and record the displayed value of the equipment. Compare the standard value with the equipment value, calculate the error and adjust it to the allowable range. Limitation: Up to 3 devices can be calibrated at a time. Temperature calibration technical requirements: Calibration points are -10 ℃, 30 ℃, and 60 ℃, and the temperature is controlled using a constant temperature bath. Process: Insert the device temperature probe into the constant temperature bath, wait for the temperature to stabilize, and then read the device display value. Compare the standard thermometer (installed on the flange side) with the equipment value and correct the deviation of three temperature points. Interface: M141.5 or M201.5 (EK series requires confirmation of sealing type). Flow calibration technology requirements: Simulate flow signals (0.2/0.4/0.6/0.8/1Hz) through a frequency generator, read the equipments working status, standard status, and conversion coefficient. Process: Connect the frequency generator to the device being calibrated, set the frequency, and record the feedback data from the device. Verify the flow calculation logic (such as whether pressure and temperature compensation are correctly applied).

2. Calibration of integrated volume correction instruments (Cangnan LLQC/LWQC, Tianxin TBQZ) Pressure calibration technical requirements: Calibration range of 5-40 bar (absolute pressure

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