Valve selection basis and selection guide

Valve selection basis and selection guide

Valve selection is very important for the long term operation of the equipment under working conditions. It is unprofessional when we don't know the selection of valves, which is a source of accidents and safety threats.

　　Nowadays, the demand for valve products in the social industry is becoming more and more extensive, and users should have a further understanding and knowledge of valves and other aspects.

　　Valve characteristics are generally two kinds, use characteristics and structural characteristics.

　　Use characteristics: it determines the main use of the valve performance and use of the scope of use, the use of the valve characteristics include: the type of valve (closed-circuit valves, control valves, safety valves, etc.). ; Product type (gate valve, globe valve, butterfly valve, ball valve, etc.). ; the main valve components (valve body, valve cover, valve stem, valve flap and sealing surface) of the material; valve transmission mode, etc..

　　Structural characteristics: determines the structural characteristics of the valve installation, repair, maintenance and other methods. Structural features include: the structural length and overall height of the valve, the form of connection with the pipeline (flange connection, threaded connection, clamp connection, external threaded connection, welded end connection, etc.). ; the form of sealing surface (insertion ring, threaded ring, surfacing, spray welding, valve body); the type of structure of the valve stem (rotating stem, lifting stem) and so on.

　　Whether in piping systems in the petroleum, chemical, or other industries, the application, frequency of operation, and service of valves are constantly changing. To control or even eliminate minor leaks, the most important and critical piece of equipment is the valve. The ultimate control of the pipeline is the valve, and valves are unique in their service and reliable performance in all areas.