How to correctly choose pneumatic valve

how to correctly choose the life of the pneumatic valve model for pneumatic valves and full play to the performance of the pneumatic valve some help depends on sex.
the correct choice of pneumatic valve conditions:
. Chooses the purpose of the pneumatic valve, the working conditions of use and operation control mode
. The nature of the working medium, working pressure, working temperature, corrosion performance, whether or not containing solid particles, medium is toxic and is flammable, explosive medium, medium viscosity, etc.
. The requirement: the characteristics of the pneumatic valve fluid flow resistance, discharge capacity, flow characteristic, seal grade, etc.
. Installation size and shape size requirements: nominal diameter, and pipeline connection and the connection size restrictions on the size or weight, appearance, etc.
. Reliability of pneumatic valve products, explosion-proof electric device performance and service life of additional requirements
( Should be paid attention to in the selected parameters: if pneumatic valve to be used for control purposes, must determine the following additional parameters, operating methods, the maximum and minimum flow, normal flow pressure drop, the closing of pressure drop, the maximum and minimum inlet pressure of pneumatic valve. ）
choose according to the above the basis and the steps of the pneumatic valve, reasonably and correctly choosing pneumatic valve must also to the internal structure of various types of pneumatic valve in detail, in order to make the right of priority selection of pneumatic valve. The ultimate control of
the pipe is pneumatic valves. Pneumatic valve opening and closing a control flow of the medium in the pipe, the shape of the pneumatic valve flow pneumatic valves have a certain flow characteristic, in choosing pipe system is most suitable for installation of the pneumatic valve must consider this.
the correct selection of pneumatic valve
the significance of correct selection of pneumatic valve, to ensure safety in production plant, improve the service life of pneumatic valves, meet the equipment operation is crucial for a long period of time. Many pneumatic valves improper pneumatic valve selection is the major cause of the accident, such as in cold areas use pneumatic valve, cast iron by water in the oil product in pneumatic valve, frosty winter freezes easily pneumatic valves.
in some export pneumatic valve in the pump body, for some reason, the process is low, but with the pump power is larger, often using small brake pipe pneumatic valve to regulate flow, the method of the pneumatic brakes local open the valve plate, vibration, acceleration of ram and pneumatic valve seat sealing surface wear and tear, it is easy to cause leakage of pneumatic valve. In addition, pneumatic valve quality also has a great influence for production use.
as catastrophic explosion accident of a chemical fertilizer plant, the cause of the accident to find out, is a pneumatic valves have serious quality problems caused by the responsibility of the accident.
the explosion reason: the second section of the export of pneumatic valve withstand the normal working pressure suddenly burst, check, pneumatic valve failure in the system. MPa of semiwater gas overflow, rapid and ambient air mixed explosive gas space formation, gas chemical explosion.
according to detection the pneumatic valve has many indicators do not conform to the relevant state standards.
in addition, the two are all with water, steam and oil as medium of pneumatic valves, non combustible gas special pneumatic valves, selection of design department is also wrong.
as a result, the correct selection of pneumatic valves for device production, safety and long period operation, improve the efficiency is very important.