Eccentric hemisphere valve description of knowledge

by:AIRWOLF     2020-05-17
Eccentric hemisphere valve function and knowledge summary eccentric hemisphere valve has the function of cutting, in the closed to the media clutter ( Branches, textile bags, etc. ) Cut off, ensure the normal order of the valve door opening and closing. 1, the eccentric hemisphere valve by valve body, eccentric shaft, valve cover, spherical cap, bushings, valve seat main parts, such as through the eccentric shaft rotation 90 & deg; To realize the valve door open/close, have the effect of truncation medium. 2, eccentric hemisphere valve to ensure the valve door in the process of opening or closing, the valve seat and the spherical cap without rubbing against each other, eccentric hemisphere valve adopts eccentric crankshaft, making the center line of the spherical cap deviates from the center line of the valve gate runner an eccentricity. When the valve door open, the crankshaft turns a small Angle, the ball will leave the valve seat, spherical cap and valve seat are no longer contact; On the other hand, in the process of the valve door closed, only in the closing moments, spherical cap and valve seat contact. 3, eccentric hemisphere valve, adopting the jacket structure in the process of maintenance, do not need to be removed from the pipeline, only need to remove the valve cover bolts and remove the valve cover, which can remove the eccentric shaft, in this case the guarantee the valve door can on-line maintenance. 4, eccentric side when the valve is in open should guarantee the port completely open, small head loss at runtime. Sphere using semicircular channels, has a good circulation performance and linear regulation performance, and impurities will not deposit in the valve body within the lumen. 5, eccentric hemisphere valve should have sufficient strength, eccentric crankshaft are structure of trunnion mounted ball, no vibration under high velocity, shell test GB13927 - according to the national standards 1992 is carried out. 6, eccentric side there is no valve leakage, upper and lower shaft end should be used at least 2 O ring seal. 7, eccentric hemisphere valve has the function of cutting, sundry (in close to medium Branches, textile bags, etc. ) Cut off, ensure the normal order of the valve door opening and closing.
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