Large diameter pneumatic valve selection ( 2)

with the expansion of the device size, large caliber regulating pneumatic valve is applied more and more. Because angular travel kind of pneumatic valve has simple structure, small size, light weight. Therefore, large diameter pneumatic valve usually use angular travel class pneumatic valve ( Traditional pneumatic valve gate also will gradually replaced by pneumatic valve adjustment) 。 Nominal diameter larger than the direct pneumatic valve, greater than the pneumatic ball valve and greater than the pneumatic butterfly valve are large caliber of special pneumatic valve. When arithmetic series are added to the calibre of the pneumatic valve, pneumatic valve in the closed under static pressure load will increase by geometric series. Therefore, shaft strength, bearing load, unbalanced force and the thrust of the actuator is must consider factors such as a, several problems that should be paid attention to ( ） System pressure and pressure difference is too big, so that you can provide enough headroom large thrust actuator, and weight. （ ） Because of the noise level and flow rate is proportional to the, so the noise level is a problem must be carefully considered, should choose as far as possible through port or additional holes injection type structure, reduce the speed and flow of fluid through the throttle opening to reduce the noise level. （ ） Because of the stress area is large, large unbalanced force, unstable factors, thus improve the pneumatic valve integral rigidity and vibration resistance is also a factor must be considered. （ ） For large diameter pneumatic valve, because of big size, weight, and transportation, installation and maintenance are more complex, the pneumatic valve installed in the pipeline, and remove and replace the main components are required to use the crane equipment, therefore, to improve the reliability, reduce weight is also a need to focus on two, 'day' font support role of rotating class of large diameter pneumatic valve in order to improve the rigidity, pneumatic valve stem usually coarser, pneumatic valve core or pneumatic valve plate at the same time is also very heavy. How to ensure the heavy pneumatic valve plate positioning and flexible pneumatic valve core movement is one of the major technical problems. Shenyang company a unique 'day' word bracket can better solve this problem, and the greater the effect, the more obvious the calibre of the pneumatic valve. 'Day' type of thrust bearing can withstand pneumatic valve plate ( Pneumatic valve core) And the weight of the pneumatic valve stem, make its like being hung, guarantees the pneumatic valve plate ( Pneumatic valve core) Move freely, improve its sensitivity. At the same time ', 'word bracket will pneumatic valve plate ( Pneumatic valve core) In the longitudinal lock, guarantees the pneumatic valve plate ( Pneumatic valve core) The accuracy of positioning, avoid the pneumatic valve plate (due to gravity of Pneumatic valve core) Unilateral deviation, which brings the problems such as mountains, improve the reliability of the action. Longitudinal lock also improved the pneumatic valve longitudinal stiffness, improve the ability of pneumatic valve shock resistant effect, thus to improve the use of pneumatic valve performance as a whole. Three, typical of large diameter pneumatic valve large-diameter ball valve, large diameter fully functional ultra light regulating pneumatic valve, diameter of DN, is developed by shenyang company s advanced technology level of a new generation of regulating pneumatic valve, compared with the old large diameter ball pneumatic valve, weight % above, and in such aspects as overall stiffness, vibration resistance and noise level significantly. Its eccentric rotating structure can guarantee on the pneumatic valve with pneumatic pneumatic valve core seat out immediately, small friction resistance, the actuator force is small, high reliability. Using the integration of the pneumatic valve body structure, high strength, light weight. Waring unique patented technology ', 'font support more in the seismic performance, action sensitivity, reliability is much better than the traditional large diameter ball pneumatic valve. Large caliber automatic relief design more can guarantee the pneumatic valve under the condition of large diameter, large pressure difference can still reliable action, to ensure safety. Four, large diameter butterfly pneumatic valve of large diameter butterfly valve series is shenyang company one of the main products for large diameter pneumatic valve, usually DN acuity, all are done by pneumatic valve adjustment. Using common adjusting structure of pneumatic valve leak rate is %; Elliptical butterfly structure of pneumatic valve leak rate is per thousand. Damper control pneumatic valve leakage rate of the structure. Per thousand. Triple eccentric butterfly pneumatic valve leakage rate for the above. Shenyang company a unique 'day' word bracket can greatly improve the overall performance of pneumatic valve adjustment, duplex, multi cylinder actuator or hydraulic actuators, can be reliably used in large diameter, large flow control occasions. Butterfly pneumatic valve can provide large diameter is usually. ~。 Meters, maximum to m ( Tight near shenyang double factory in China, a company's biggest lathe can be car meters in diameter, the largest CNC spherical lathe for m) 。 Keywords:
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