When purchasing visual valves, the surface should be free from blisters. The plating should be even and uniform, and you should check for any signs of peeling, cracking, burning, exposed base, flaking, dark spots, or obvious pitting. The sprayed surface should be fine, smooth, and consistent, with no sagging or visible defects. These issues can significantly impact the valve’s durability and performance.
Civil valves are commonly found in households and include gate valves, ball valves, and triangular valves, typically made from iron or copper. Copper valves have become more popular due to their superior mechanical properties, reduced rusting, and better corrosion resistance compared to iron valves. Triangular valves are usually electroplated, serving not only to control the flow of media in pipelines but also as a decorative element. They are often connected to pipes and hoses for faucets, toilets, and water heaters.
Gate valves are typically used for connecting pipes to water meters, while ball valves are ideal for connecting pipes to water heaters. Ball valves are preferred over other types because they are easier to open and close. As a result, most modern pipe connections use ball valves.
When purchasing civil valves, consider the following:
1. For visual valves, ensure the surface is free from blisters. The plating should be even and uniform, and inspect for any signs of peeling, cracking, burning, exposed base, flaking, dark spots, or pitting. The spray finish should be smooth, fine, and even without sagging or visible flaws. Any of these defects can reduce the valve's lifespan.
2. Check the pipe threads for dents, broken teeth, or other visible damage. Pay special attention to the effective sealing length of the thread, as this affects the valve’s reliability. For standard DN15 cylindrical threads, the effective length is generally around 10mm.
3. Gate and ball valves usually have their nominal pressure marked on the body or handle. Choose based on your specific needs.
4. If replacing an existing gate or ball valve, measure the dimensions of the current valve to ensure compatibility after installation.
5. Triangular valves may have internal or external threads, so choose accordingly. Be cautious of some zinc alloy valves available on the market, which are cheaper but prone to corrosion and potential rupture.
To ensure quality, it is best to purchase from regular building material stores or shopping malls where product quality is more reliably guaranteed.
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