When purchasing visual valves, the surface should be free of blisters. The plating should be even, and you should check for any signs of peeling, cracking, burning, exposed base, flaking, dark spots, or obvious pitting. The spray finish should be fine, smooth, and uniform, with no sagging or visible defects. These imperfections can significantly affect the valve's lifespan and performance.
Civil valves are commonly used in households and come in various types such as gate valves, ball valves, and triangle valves, typically made from iron or copper. Copper valves have become more popular due to their better mechanical properties, less rusting, and superior corrosion resistance, gradually replacing iron valves. Triangle valves are usually electroplated, serving both functional and decorative purposes. They are commonly connected to pipes, water hoses, faucets, and toilet supplies, as well as water heaters.
Gate valves are primarily used for connecting pipes to water meters, while ball valves are often used for pipe connections to water heaters. Ball valves are preferred because they are easier to open and close, making them the most common choice for pipe-to-meter connections today.
When purchasing civil valves, it’s important to choose based on your specific needs:
1. For visual inspection, ensure the surface has no blisters. The plating should be even, and check for peeling, cracking, burning, exposed base, flaking, dark spots, or pitting. The spray finish should be smooth and uniform, without sagging or defects. Any of these issues can reduce the valve’s durability.
2. The pipe thread must be free of dents or broken teeth. Pay attention to the effective sealing length of the thread, as this affects the reliability of the connection. For example, a standard DN15 cylindrical thread should have an effective length of about 10mm.
3. Gate and ball valves usually have the nominal pressure marked on the body or handle. Choose according to your requirements.
4. If replacing an existing gate or ball valve, make sure to measure its dimensions to avoid installation issues.
5. Triangle valves may have internal or external threads, so choose accordingly. Also, be cautious of zinc alloy valves available in the market, as they are cheaper but prone to corrosion and may rupture over time.
To ensure quality, it is recommended to purchase from reputable building material stores or shopping malls, where product quality is more reliably guaranteed.
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