woltmann water meter| flow meter water

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1. Water meter pressure loss?

National Standard of the Peoples Republic of China Cold Water Meter Part 1: Specification Measuerment of water flow in closed conduits GB/T 778.1-1996-Meters for cold potable water eqv ISO4064-1:1993 -Part 1:Specifications This standard replaces the scope of GB778-841 and is part 1 of GB/T778, covering terminology, technical characteristics, metrological characteristics, and pressure loss. This standard is applicable to water meters of different measurement levels (Chapter 5) with a commonly used flow range of 0.6-4000m3/h, a maximum allowable working pressure (MAP) equal to or greater than 1MPa, and a maximum allowable temperature (MAT) of 30 ° C. This standard is only applicable to volumetric and velocity water meters. GB/T 778 stipulates that eggplants must comply with regulatory requirements. The articles included in the following standards are referred to as articles of this standard by reference. At the time of publication, all versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB 4208-93 Degrees of Protection Provided by Enclosures (IP Code) GB 4216.4-84 10 bar Grey Cast Iron Pipe Flange Dimensions GB 7306-87 Pipe Threads Sealed with Threads GB 7307-87 Non Threaded Sealed Pipe Threads 3 Definitions This standard adopts the following definitions: 3.1 Volumetric meter is a water meter installed in a closed pipeline, consisting of chambers of known volume that are gradually filled and discharged with fluid and a mechanism driven by the fluid. By calculating the volume of water flowing through the device, the volume of water flowing out can be accu

mulated. 3.2 Velocity meter is a type of water meter installed in a closed pipeline, consisting of a moving element and directly moved by the water flow velocity. The motion of the moving element is transmitted to the indicator device by mechanical or other means, and the volume of water flowing out is calculated. The Woltmann meter is a type of water meter composed of a spiral wing rotor that rotates around the flow axis. Single jet and multi jet meters are a type of water meter composed of a turbine rotor that rotates around an axis perpendicular to the water flow. If the beam impact is at a certain point on the edge of the rotor, it is called a single beam water meter; If multiple streams simultaneously impact several points at the edge of the rotor, it is called a multi stream water meter. The flow rate of 3.3 is the quotient of the volume of water passing through the water meter and the time required for this volume to pass through the water meter. The unit symbol for flow rate is expressed in m3/h

3.4 Common flow rate (qp) The optimal flow rate for a permanent flow rate water meter under normal working conditions, i.e. stable or intermittent flow

3.5 Overload flow rate (qs) The maximum flow rate that an overload flow rate water meter can use in a short period of time without damage. Its value is twice the commonly used flow rate

3.6 Minimum flow rate (qmin) The minimum flow rate that requires the water meter to provide a value within the maximum allowable error limit. It is related to the numerical value of the water meter code. The flow rate range is defined by the minimum flow rate and overload flow rate, and within this range, the reading of the water meter shall not produce errors exceeding th

woltmann water meter

1. Water meter pressure loss?

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