Choose the method of pneumatic valve

in the fluid piping system of pneumatic valve is a control element, its main function is to isolate equipment and piping system, regulating flow, preventing backflow, and discharge pressure. Because the pipeline system to choose the most suitable pneumatic valve is very important, so, understand the characteristics of pneumatic valves and pneumatic valve steps and basis also became more critical.
pneumatic valve pressure on a material cast copper, cast iron, ductile iron, high silicon cast iron, cast steel, forged steel, high ( Low) Alloy steel, stainless acid-resistant steel, hartz alloy, for families, nickel, monel alloy, duplex stainless steel, titanium alloy, etc. And can produce all kinds of electric, pneumatic, hydraulic pneumatic valve actuator.

in the face of so many varieties of pneumatic valve and complex working conditions, to choose the most suitable for installation of the pneumatic valve products pipeline system, should first understand the characteristics of pneumatic valves; Second should master pneumatic valve steps and basis; Moreover should follow the principle of selecting pneumatic valve.
there are generally two kinds of the characteristics of the pneumatic valve using characteristics and structural characteristics.
, using features: it determines the main use of performance and use scope of pneumatic valves, belong to use pneumatic valve characteristics are: the category of the pneumatic valve ( Closed-circuit pneumatic valve, pneumatic valve, safety valve adjustment; Product type ( Pneumatic valve gate, globe pneumatic valve, butterfly valve, pneumatic ball valve, etc. ; Pneumatic valve main parts ( Pneumatic valve, pneumatic valve cover, pneumatic valve, pneumatic valve, sealing surface of materials; Pneumatic valve driving mode, etc.
and structural features: it determines the pneumatic valve installation, maintenance, maintenance methods of some of the structural characteristics, belongs to the structural characteristics are: the structure of the pneumatic valve length and overall height, and pipeline connection form ( Flange connection, threaded connections, clip connection, external thread connection and welding end connection, etc. ; In the form of sealing surface ( Insert, thread ring, welding, spray welding, pneumatic valve body; Pneumatic valve rod structure ( Rotating rod, lifting lever, etc.
select steps and basis of pneumatic valve is generally as follows: a, choose

and clear in equipment or devices use pneumatic valve, pneumatic valve operation conditions were determined: suitable medium, working pressure, working temperature and so on.
and connected to the pneumatic valve nominal pipe size and the connection mode: flange, threaded and welding, etc.
and determine the operation of pneumatic valve mode: manual, electric, magnetic, electrical and pneumatic or hydraulic linkage or electro-hydraulic linkage, etc.
, according to the pipeline medium, working pressure, working temperature to determine the selected pneumatic valve shell and internal parts of material: gray cast iron, malleable cast iron, ductile iron, carbon steel, alloy steel, stainless acid-resistant steel, copper alloy, etc.
and choose the types of pneumatic valves, pneumatic valves, closed circuit control pneumatic valves, safety valves, etc.
, determine the pneumatic valve type: brake pneumatic valve, globe pneumatic valves, pneumatic ball valve, butterfly valve, throttle pneumatic valve, safety valve, pressure pneumatic valve, pneumatic valve, steam trap, etc.

2, and the choice of pneumatic valves according to
in the understanding of select pneumatic valve steps at the same time, should also learn more about choosing the basis of a pneumatic valve.
and chooses the purpose of the pneumatic valve, working conditions of use and operation control mode.
and the nature of the working medium, working pressure, working temperature, corrosion performance, whether or not containing solid particles, medium is toxic, whether it is flammable, explosive medium, medium viscosity and so on.
and the requirement: the characteristics of the pneumatic valve fluid flow resistance, discharge capacity, flow characteristics, sealing level and so on.
and installation size and shape size requirements: nominal diameter, and pipeline connection and the connection size restrictions on the size or weight, appearance, etc.
, reliability, service life of pneumatic valve products and electric devices of explosion-proof performance such as 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.