The basic knowledge of the valve type selection

A commonly used valve type, at home, there are a dozen common valve, one of the biggest dosage was gate valve, globe valve, check valve, butterfly valve, ball valve, plug valve, diaphragm valve and seven. Second, the characteristics of the valve in order to correctly select the use of the valve, need to understand in detail the characteristic of various valves. Valve generally has two features: ( 1) Use features which determines the main performance and using range of the valve. Belong to use features are: valve categories ( Closed valves, regulating valves, safety valves, etc. ) ; The types of products ( Gate valve, globe valve, butterfly valve, ball valve, etc. ) ; Valve main parts ( Body and bonnet, valve, sealing surface) The materials; Valve drive way, etc. ( 2) Structural characteristics it determine the valve installation, maintenance, maintenance methods of some structure characteristics. Belong to the structure characteristics are: valve structure length and the overall height; (with the pipe connection Flange connection, threaded connection, clip connection, external thread connection and welding end connection, etc. ) ; In the form of sealing surface ( Inlaid ring, ring of thread machining, welding, spray welding, the body itself out) ; Stem structure ( Rotating rod, lifting lever) And so on. It is important to note that in some structure formation, the using characteristics and structural characteristics are connected with each other, cannot be separated. Reprint please indicate the url: http://dazkfy. com/