electric regulating valve small make up introduced before the kinds of many, many, so the question becomes, how users should be better to choose? Is the electric control valve selection, today small make up integrate some of the main points of the selection, hope can help you.

electric control valve selection depends mainly on the following factors:

pipeline medium ( To determine whether corrosion)

medium temperature ( Judge seal)

pipe valve before and after valve pressure and differential pressure.

drive mode: electric, pneumatic.

maximum flow coefficient.

minimum flow value, maximum flow rate.

control valve consists of two parts, actuators and valve, control valve selection should follow the following principles:

according to the process conditions, select the appropriate structural form and material

1, according to the structure of valve body can be divided into single seat valve, two-seater Industrial Valves, Angle valve, three-way valve, eccentric rotary Industrial Valves, butterfly valve, ball valve, diaphragm valve, etc. Before choose the valve, to control the process of medium, the careful analysis of process conditions and parameters, collect enough data, understand the system of regulating valve requirements. Can from the following several aspects to consider 1) The shape of the valve core structure is mainly based on the selected flow characteristic and factors such as unbalanced force.

2) Wear resistance, when the fluid is suspending liquid containing high concentrations of wear particles, the valve core and valve seat joint friction surface every time shut down severely. An internal valve flows to smooth, valves materials to be smooth.

3) Corrosion resistance, due to the corrosive medium, in the case of can satisfy regulating function, should try to choose simple valves.

4) Medium temperature, pressure, when the medium temperature, high pressure and large, should choose the valve core and valve seat materials by temperature, pressure changes small valves.

5) To prevent flash flash and cavitation and cavitation, and only produced in liquid medium. Flash and cavitation effect not only the calculation of flow coefficient, still can form the vibration and noise, prolong the life of the use of the valve. Such as sleeve valve with eccentric rotary valve in vibration and noise of the larger occasion sleeve valve, suitable medium and sticky or with small particles, the selection of eccentric rotating valve more appropriate.

2, the material selection of regulator of each components, especially contact with process fluid within the Industrial Valves body and valve components, in the proper selection of material and the structure of the regulating valve type is as important as the choice of nominal diameter. Choose regulating valve material the following factors must be considered.

1) The influence of fluid pressure and temperature on the material.

2) The influence of fluid corrosion on the material.

3) Fluid cavitation phenomenon and mud flow's influence on the material.

4) From the consideration on the structure, material piece together if there is a problem. The valve body material generally higher than the choice of pipe material;

) Under the condition of high temperature, it is necessary to fully consider changes of microstructure of high temperature strength, high temperature and corrosion resistance. Generally contain steel materials, chromium, nickel, molybdenum, etc.

b) Under high temperature and high pressure, steel erosion by hydrogen, generally causes decarburization phenomenon, cause embrittlement ( Often referred to as hydrogen embrittlement) 。 Steel with chromium, nickel, molybdenum and other elements, it combine with carbon, hydrogen corrosion resistant steel can be improved.

c) In choose the material of low temperature and low temperature impact value should be fully considered, but also of the decline of the material appeared in the low temperature toughness. The type of stainless steel mechanical properties at low temperature is stable, often use. （ 304316 l)

d) When the fluid is a liquid, especially hot water, must fully consider the material resistant to cavitation problem. Especially the temperature of the fluid is greater than 100 ℃, it is best to chrome molybdenum steel.

e) Corrosion resistant materials generally have stainless steel and 20 # steel, the type of alloy, etc. Components in the valve material generally with 304, 316, such as stainless steel, sometimes according to the special situation for hardening treatment. Under normal temperature and normal pressure difference do not hardening treatment, but the seat requires high precision, small leaks, also should consider hardening treatment.

small make up more than some integration with the spectrum of the electric control valve selection method, in fact, the best selection method is that you can call the company technology, let them give you answer, recommendations, and of course when you encounter an unscrupulous businesses, often this failure, hope the above information will help you.

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