industry valve  pipeline control the flow of an important attachment medium, heavy on the valve of the practical applications notes, detailed reference section view principle and structure of information books,
Valve from the valve, opening and closing body, valve cover three major components, the second focuses on the structure of the company’s common valve characteristics and the proper use of notes.
industry valve 1, the role of industrial valves
1, open and close function - to cut off or the communication pipe and the fluid flow;
2, regulation - regulating the flow rate, flow rate;
3, saving role - so much fluid through the valve resulting from the pressure drop;
4, the other role - a. Automatically shuts b. c. maintain a certain pressure waste gas drainage.
Second, the types of industrial valves
1, according to zoning: cut off valves, regulating valves, diversion valves, valve type, valve type;
2 points by force: he moves with the valve, automatic valve function.
Third, the main parameters of industrial valves
PN nominal pressure (the maximum allowed by the pressure of fluid);
DN nominal diameter;
TN temperature range (to allow the fluid temperature range).
Fourth, industrial valve check before use
Inspection items include:
1, valve body inner and outer surface with or without trachoma, cracks and other defects;
2, valve seat and valve body junction is strong, whether the valve core and valve seat match, sealing surface for defects;
3, the stem and the valve connection is flexible and reliable, whether the stem bending, with or without thread damage, corrosion;
4, packing, gasket is old and broken;
5, the valve is open and flexible.
5, industry valve  problems often use the process
1, with the pipe flange joints, thread leakage;
2, Han packing leakage, leakage and the valve stem to open lumbar pad fixed;
3, valve core and valve seat formed within the strict relations between the leakage.
6, the characteristics of valves commonly used in industry and the use of notes