Valves are classified by drive, use and function

Valves are classified by drive, use and function

York valve, it is mainly composed of valve body, opening and closing components and valve cover three parts. The valve seat in the valve body, the valve stem drives the opening and closing parts of the valve (disc) to do lifting movement, disc and valve seat clutch, so that the valve opens and closes.
York valve, it is mainly composed of valve body, opening and closing components and valve cover three parts. The valve seat in the valve body, the valve stem drives the opening and closing parts of the valve (disc) to do lifting movement, disc and valve seat clutch, so that the valve opens and closes.
The opening and closing mechanism consists of the valve disc (also known as disc, spool), valve stem and driving device (handwheel). Stem with trapezoid thread screw on the cover, the handwheel and disc fixed on both ends of stem up and down, turn the handwheel, the stem rises or falls, near or leave to drive the valve seat valve to close and open, disc and seat close match, the disc by the pressure of the valve stem compression on the seat, when the valve is fully closed position, the valve does not leak tight.
Valve is a small functional device used in industrial and urban construction, its function is to control the pipe and equipment in the medium (liquid, gas, powder) of the state of activity. Valves in its role in the management of the characteristics of classification, across industry and civil general valves can be divided into gate valves, globe valves, plug valves, ball valves, butterfly valves, diaphragm valves, etc.. View research world released “China valve industry development trend and investment prospects forecast report 2013-2017″ pointed out, China’s valve industry is in the middle of the last century began to rise, due to the needs of industrial construction and urban construction, the production scale of the valve industry from small to large, and in practice and the introduction of foreign technology conditions, from only a simple more than 600 varieties can be developed to produce the main With 12 categories of valves and more than 3000 models, the company has made great progress in r&d and production.
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1) Automatic valves rely on the ability of the medium (liquid, air, steam, etc.) to act on its own. Such as safety valve, check valve, pressure reducing valve, steam trap, air trap, emergency cut-off valve, etc. 2) Drive valve A valve operated by hand, electric, hydraulic or pneumatic force. Such as gate valve, globe valve, throttle valve, butterfly valve, ball valve, plug valve and so on.
There are many kinds of valves, valve classification methods are also many, this paper mainly to drive classification, the use of valves and the role of classification.
With the continuous improvement of the process flow and performance of all kinds of complete sets of equipment, the types of valves are still increasing, and there are many classification methods.
Valves are classified as automatic and actuated
1) Automatic valves rely on the medium (liquid, air, steam, etc.) its own ability and self-action of the valve. Such as safety valve, check valve, pressure reducing valve, steam trap, air trap, emergency cut-off valve, etc.
2) Drive valve A valve operated by hand, electric, hydraulic or pneumatic force. Such as gate valve, globe valve, throttle valve, butterfly valve, ball valve, plug valve and so on.
Valves are classified by use and function
1) The cut-off valve is mainly used to cut off or connect the medium flow in the pipeline. Such as globe valve, gate valve, ball valve, plug valve, butterfly valve, diaphragm valve and so on.
2) the check valve class is used to prevent the media from flowing back. Such as a variety of different structures of check valves.
3) Regulating valve class is mainly used to regulate the pressure and flow of pipeline medium. Such as regulating valve, throttle valve, reducing valve and so on.
4) The shunt valve class is used to change the direction of the flow of medium in the pipeline, and plays the role of distributing, shunt or mixing medium.
Such as distribution valves of various structures, three-way or four-way cocks, three-way or four-way ball valves, various types of traps, etc.
5) Safety valve for overpressure safety protection, discharge of excess medium, to prevent pressure beyond the specified value. Such as various types of safety valves.
6) Multi-purpose valve class is used to replace two, three or more types of valves. Such as stop check valve, check ball valve, stop check safety valve, etc.
7) Other special valves such as blowdown valve, vent valve, coke valve, pigging valve, etc.