The water pipe φ 25× 1/2 indicates that its outer diameter is 25. The actual corresponding nominal diameter is DN20 (that is, people often say 6 branches). You can buy a 6-cent faucet. You can also buy a faucet for 4 cents (just add a reducer between the pipe and the faucet).
The styles and materials of household faucets are ever-changing, but the threaded parts connected with pipes are divided according to the sizes of 4 points, 6 points and 1 inch. Don't worry about buying it wrong.
Generally speaking, the measuring unit of four branches is inches, so four branches are 1/2 inches (4/8= 1/2) and one inch is =25.4mm, so the inner diameter of four branches is 25.4/2= 12.7mm, which is commonly known as DN/kloc.
Point 4 is the name of the diameter and length of the British pipeline, that is, 1/2 inch is equal to 15 mm in the metric system.
1 inch equals 8 points, which is 25.4 mm in metric system.
6 pounds =3/4 inch = 20 mm.
4 pounds = 1/2 inches = 15 mm.
In addition, remember that pipes are all calculated by inner diameter, but the threads of pipes are calculated by middle diameter, which is represented by diameter DN. Threads are divided into metric M and English G, pipe threads are generally English, and the thread angle is 55 degrees. The metric system is 60 degrees.
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As a kind of water pipe, galvanized metal pipe will produce a lot of rust after several years of use. The yellow water not only pollutes the sanitary ware, but also is mixed with bacteria that breed on the unsmooth inner wall. Due to corrosion, the content of heavy metals in water is too high, which seriously endangers human health (the state has issued regulations prohibiting it from being used as a drinking water pipeline).
Copper tube has the advantages of corrosion resistance and sterilization, and is the first-class product in water pipes. The connection methods of copper tube interface include clamping sleeve, welding and self-locking clamping spring. The casing is stuck for a long time, which has the problem of aging and water leakage. Welding is to fuse two connectors together by hot melting process to achieve the effect of connection. The connection strength is high, and the welding gas protection at the field welding joint is difficult to meet the standard, which leads to the rust of the weld and directly reduces the service life of the pipeline; The installation quality is highly dependent on the welding workers' skills, and the quality is difficult to stabilize.
The operation is simple and convenient, and the construction personnel only need to be familiar with its operation requirements and master it with a little practice. When connecting, the end face of the pipeline incision should be perpendicular to the pipeline axis, and the burrs inside and outside the incision should be cleaned up. Mark the depth to be inserted on the outside of the front end of the copper tube with a marker, and then insert the copper tube into the pipe fitting to the end. Low installation risk, suitable for various installation environments, reusable, environmentally friendly and energy-saving; No leakage, shockproof, anti-thermal expansion and cold contraction, safe to use, durable and reliable.
One disadvantage of copper tube is its fast heat conduction, so the hot water pipes produced by well-known copper tube manufacturers are all wrapped with plastic and foaming agent to prevent heat dissipation. Another disadvantage of copper tube is its high price. The construction cost of welding is high, and few families use welded copper pipes for decoration.
Stainless steel is safe, hygienic, healthy and durable, which eliminates the pollution problem of plastic pipes and saves a lot of money compared with copper pipes. It is the first choice for water pipes.
Stainless steel is not only used in medical treatment, food, beverage, petrochemical industry, our tableware and teapot, but also can be implanted into human body, such as artificial steel skeleton and artificial teeth. After decades of application, it has been proved that stainless steel has the advantages of excellent corrosion resistance, sanitation, no rust, no scaling, no dialysis, no release of foreign substances, good self-cleaning, long service life, environmental protection and 100% recovery.
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