Adjust the pneumatic valve, several problems that should pay attention to in installation 23)

in engineering design, as the need to be addressed in the design of technical personnel of the automatic control of pneumatic valve various instrument of automatic timing control system, pneumatic control valve selection is correct or not, directly affect the quality of the adjustment of the control system. If choose undeserved, pneumatic control valve, the system will not work properly, or damage to the pneumatic valve quickly, even results in industrial accident. A considerable number of people on the choice of control pneumatic valve, pneumatic valve diameter tend to be more emphasis on the selection of calculation and other types of pneumatic valves, no attention. According to my many years of work experience and investigation, pneumatic valve control system work accidents caused by abnormal, % above is due to incorrect choice, and through the calculation error is less than % of the problem. This article will focus on the pneumatic control valve selection problem.
, classification and characteristics of pneumatic valves
base on the basis of the structure is divided into ordinary products are divided into several categories of products, they respectively are: the pass-through single-seat pneumatic valve, pneumatic valve by engine, sleeve pneumatic valve, pneumatic valve, tee, pneumatic valve, pneumatic diaphragm valve, butterfly pneumatic valves, pneumatic ball valve, pneumatic valve, eccentric rotating them straight travel pneumatic valve, after a kind of rotary control pneumatic valve, pneumatic control valve, the application of these products, you must first understand the characteristics of the base, using the guidelines, varieties of all kinds of products, improve product.
( ） Through single-seat regulating pneumatic valve
the pneumatic valve has a small leakage, allow the differential pressure, flow path and complex, simple structure, whether there is a leak, clean, small and medium pressure working environment the characteristics of the strict request, but the pneumatic valve ( As the DN, a small size) Can also be used in stressful situations, is one of the most widely used pneumatic valves.
( ） By engine control pneumatic valve
in compared with single-seat pneumatic valve has a big hole, allowing a feature of the pressure, whether there is leakage of strict requirements, clean media where there is a big pressure difference is one of the most widely used pneumatic valves.
( ） Pneumatic valve sleeve
sleeve with single seal, pneumatic valve, double sealing two structures, the former is equivalent to a single-seat pneumatic valve, pneumatic seat this is equivalent to, in addition, the sleeve pneumatic valve has good stability, convenient operation characteristics of pneumatic valve seat, but is expensive than single-seat pneumatic valve % %, but also need special winding gasket. Is second only to a single, two-seat pneumatic valve widely used in pneumatic valves.
( ） Angle of pneumatic valve
the equivalent of a single-seat pneumatic valve, pneumatic valve type throttle but pneumatic valve flow is simple, small and medium-sized, dirty pressure under the condition of leakage, and requires proper rectangular tube, etc.
( ） Tee pneumatic valve
and a channel, can replace by merging two phases distributary and ℃ or less to the temperature difference between two single-seat pneumatic valve DN & amp; lt; Mm, instrumentation engineering design work.
( ）
diaphragm of diaphragm flow is simple, in addition has certain corrosion resistance, medium and weak unclean two corrosive medium.
( ） Butterfly
to take straight body, the body seats, self-cleaning performance, small volume, light weight, fit, large diameter is not clean, high flow, low pressure difference. When DN& gt; Mm, commonly used the pneumatic butterfly valve.
( ) Ball
'O' type of pneumatic valve fully open the flow adjustment, the best self-cleaning performance, especially not clean, the occasion of the secondary fiber cut medium. 'V' shape with a similar ball, such as percentage adjusting performance, not clean, fiber media adjustable regulating occasions. Pneumatic valves are more expensive.
( ） Pneumatic valve, eccentric rotation between
the self-cleaning properties between butterfly pneumatic valve, pneumatic valve and the ball good regulation performance, also can cut off the leakage of media and not clean small local laws and regulations, but more expensive pneumatic valves. Keywords:
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