Visual inspection of the valve when purchased, the surface should be no sand; plating surface should be uniform luster, must pay attention to whether there is peeling, cracking, scorch, exposed, peeling, dark spots and obvious pits and other defects; the surface of the spray coating should be fine, smooth Evenly, there must be no sag or exposed bottom defects.

First, understand the valve knowledge:

Civil valve is commonly used in ordinary families generally have gate valve, ball valve, triangle valve and other forms, usually iron or copper. Due to the good mechanical properties of copper alloys, it has the advantage of being less prone to rust and corrosion, so copper valves have gradually replaced iron valves. The triangle valve surface is basically electroplated, and its role is not only to control the flow of the pipe medium, but also can play a decorative role. Triangle valves are generally connected to pipes and inlet hoses for taps, toilets for water supply, and connecting pipes and inlet hoses for water heaters. The gate valve is basically used for the connection of the pipeline and the water meter; the ball valve is used for the connection of the pipeline and the water heater; since the ball valve is easier to open and close than the gate valve, most of the connections between the pipeline and the water meter are also ball valves.

Second, to master the purchase of civilian valves: Should choose different types of home valves according to the user's different requirements:

1, when the purchase of visual inspection valve, the surface should be no sand; plating surface should be uniform luster, must pay attention to whether there is peeling, cracking, burning, exposed at the end, peeling, dark spots and obvious spots and other defects; spray surface structure should be fine Smooth, uniform, no sag, exposed bottom and other defects. The above defects will directly affect the service life of the valve.

2. The valve thread of the valve is connected with the pipe. When the purchase is made, the surface of the thread is inspected for obvious defects such as dents and broken teeth. What is important to pay attention to is that the effective length of the threading of the pipe thread and the connecting piece will affect the reliability of the seal. Sex, when purchasing, pay attention to the effective length of the pipe thread. Generally, the effective length of the cylindrical pipe thread of DN15 is about 10mm.

3. Gate valves and ball valves are generally marked with nominal pressure on their body or handle, and they can be selected according to their own needs when they are purchased.

4. When replacing an existing gate valve or ball valve, the length of the structure must be ascertained so that it cannot be installed after purchase.

5, the triangular valve pipe thread has two kinds of internal thread and external thread, according to the need to buy; also pay attention to the current market, some of the zinc alloy manufacturing triangle valve, the valve price is lower than the average product, but Corroded and fractured.

6, should try to buy in the regular building materials stores, supermarkets, so that product quality can be guaranteed.