How to choose the valve of water heater

1. Check the valve visually when purchasing, and the surface should be free of sand holes; Electroplating surface gloss should be uniform, pay attention to whether there are defects such as peeling, cracking, burning, exposed bottom, peeling, black spots and obvious pits; The surface structure of spraying should be fine, smooth and uniform, and there should be no defects such as sagging and exposed bottom. The above defects will directly affect the service life of the valve.

2. The pipe thread of the valve is connected with the pipeline. When purchasing, visually check whether there are obvious dents, broken teeth and other defects on the thread surface. Pay special attention to the effective length of pipe thread and connector, which will affect the reliability of seal. Pay attention to the effective length of pipe thread when purchasing. Generally, the effective length of cylindrical pipe thread DN 15 is about10 mm. ..

3. Gate valves and ball valves are generally marked with nominal pressure on their valve bodies or handles, and can be selected according to their own needs when purchasing.

4. When replacing the existing gate valve or ball valve, it is necessary to find out its structural length to avoid installation after purchase.

5. There are two kinds of pipe threads in triangle valve: internal thread and external thread, which should be purchased as needed; It should also be noted that there are some triangle valve made of zinc alloy on the market at present. The price of this valve is lower than that of ordinary products, but it is easy to corrode and cause fracture.