How to purchase the valve in China

China is the biggest valve factory in the world, so at home and abroad will be more buyers to purchase the valve in our country, how can we find a number of ball valve manufacturer, and how to buy high quality valve?

First, we want to find a good stainless steel valves, the supplier and buy good quality stainless steel valves, first you need to know what are the types of commonly used stainless steel valves, commonly used stainless steel valve has the following categories: stainless steel gate, stainless steel valve, stainless steel valve, stainless steel ball valve, stainless steel butterfly valve, etc., of course, it's no use just know these valves, I also need to understand the function and structure principle of the valve, these are also buying valves it is necessary to first understand the basic knowledge, since it is stainless steel valves, we need to know what are the materials of commonly used stainless steel valves.


First stainless steel material divided into martensite stainless steel and austenitic stainless steel, special alloys and stainless steel, martensite stainless steel 113 cr, 2 cr13 and 3 cr13, etc., usually used as a useful stem, austenitic stainless steel has the SS304, SS316, SS304L, SS316L, SS317L, SS321, F51, etc., special alloy stainless steel primary monel alloy and hartz alloy, etc., of course it is no use only know these material grades, to understand the chemical composition of the stainless steel material and the mechanical function is the most perfect., of course, we know the robust stainless steel materials later, also need to know a common fault of stainless steel check valve in our country, that is to save money, advance competitive power, many manufacturers in starting and wall thickness of the valve, then let's buy time demand note before shipment to check the chemical composition of stainless steel valve is qualified, and mechanical performance is unqualified, test valves, we need to know whether the wall thickness of valve reaches the national standard, we need to use ultrasonic thickness meter to detect out of, in addition, there are many of China's casting material loose and there are sand holes, so we also need to cut the casting, then the visual castings have sand hole, if strictly, we will need a X-ray flaw detection, the valve castings, in short, if you want to buy good quality valve, we have to cengcengbaguan, from casting to the valve assembly, each link cannot be ignored, in the end, if the quality problem, we need to consider more in terms of price, usually there is an old saying in China: "shop around" that is to say, every time we purchasing valves, all need to find more than three suppliers, under the condition of the same quality, we choose the lowest price, of course, that one.