The vertical brass water meter, as a specialized measuring instrument designed for specific installation space requirements, is an indispensable key equipment in the modern water supply measurement system. With its outstanding structural integrity, long-term measurement stability, and wide environmental adaptability, it plays an irreplaceable role in vertical pipe applications.
I. Structure and Materials: Based on standard engineering design and material selection
The primary feature of the vertical brass water meter lies in its vertical installation structure. This design is in accordance with national measurement regulations (such as JJG 162-2019 “Drinking Cold Water Meter”) and related product standards (such as GB/T 778.1-2018), enabling efficient and space-saving deployment in narrow spaces such as pipe shafts and equipment rooms, effectively addressing the strict requirements for straight pipe lengths imposed by horizontal installation.
Its core material is high-quality brass (HPb59-1 or equivalent standards), with its chemical composition typically being copper content ≥ 58%, lead content strictly controlled within the safety limit stipulated by national standards (such as ≤ 0.1%), and supplemented by zinc and other trace elements. This material selection ensures the following key performances:
1. Corrosion Resistance: Capable of withstanding long-term erosion by drinking water within the pH range of 6.5 – 8.5, with an expected service life of no less than 10 years (based on standard durability tests).
2. Mechanical Strength: The casing typically withstands a pressure of no less than 1.6 MPa (i.e., PN16 pressure grade), capable of withstanding instantaneous pressure shocks of up to 2.5 MPa without permanent deformation or damage.
3. Hygiene Safety: The inner surface is smooth, meeting relevant hygiene standards, effectively inhibiting microbial growth, and ensuring the safety of end-user water supply.
II. Measurement Performance and Core Technical Parameters
The measurement performance of the vertical brass water meter is its core value. Its interior adopts multi-stream or single-stream measurement structure, driven by water flow to rotate the impeller, and converted into readings through magnetic coupling or gear transmission systems.
The key measurement parameters are as follows:
1.Nominal Diameter (DN)
Common specifications include DN15, DN20, DN25, DN32, and DN40, to accommodate different flow requirements.
2. Flow characteristics
Common flow rate (Q₃): The maximum flow rate at which the water meter can operate continuously and stably under rated operating conditions. For example, the Q₃ of a DN15 water meter is typically 1.5 m³/h or 2.5 m³/h.
Boundary flow rate (Q₂): It lies between the common flow rate and the minimum flow rate, serving as the flow value that separates the maximum allowable error range.
Minimum flow rate (Q₁): The minimum flow rate required for the water meter to respond with an indication within the maximum allowable error limit. For example, the Q₁ of a DN15 water meter can be as low as 0.03 m³/h, ensuring effective monitoring of minor leaks.
Starting flow rate (Qₛ): The flow rate that enables the water meter to start continuous indication. It is usually lower than the minimum flow rate.
3. Accuracy grade of measurement
According to GB/T 778.1-2018, the accuracy grades of cold water water meters are divided into 1 grade and 2 grades. Vertical brass water meters generally meet the 2-grade standard. Within the flow range from Q₂ (excluding Q₂) to Q₄, the maximum allowable error is ±2%; within the flow range from Q₁ to Q₂ (including Q₂), the maximum allowable error is ±5%.
4.Working temperature and pressure
Applicable to drinking cold water with a temperature range of 0.1°C to 30°C (for hot water meters, there are higher temperature grades, such as 90°C or 95°C). The maximum working pressure is typically 1.0 MPa.
III. Application fields and selection suggestions
Vertical brass water meters are mainly used in the following scenarios:
Vertical and horizontal water supply pipelines in high-rise buildings.
Pipes and instrument boxes with limited space.
Commercial complexes, public utilities, and industrial water units with high requirements for measurement reliability.
When selecting, precise matching should be based on the following data:
1. Estimated water consumption: Based on the water usage habits and equipment quantity of the users, estimate the peak flow rate and select the matching Q₃ value.
2. Pipe diameter: Ensure that the nominal diameter of the water meter is consistent with the diameter of the connected pipe.
3. Installation environment: Confirm that there is sufficient vertical space for installation and maintenance, and consider the impact of environmental humidity on the reading method of the counter (local direct reading or remote transmission).
Conclusion
The vertical brass water meter, with its rigorous structural design, copper material in line with national standards, precise measurement performance, and clear technical parameters, constitutes the most optimal measurement solution for specific installation environments. It is the foundation for the modernization and refinement of water management, and is of crucial significance for promoting water resource conservation, ensuring fair transactions and efficient operation of the water supply system. Its continuous technological advancement and strict quality control are an important part supporting smart water management and sustainable urban infrastructure development.