Contact plate for mass transfer columns - esp distn., rectification and absorption columns working under vacuum

摘要

On a contact plate for mass transfer equipment, having openings through which a gas can flow covered by valves (cover-plates) fitted with means to limit their movement, the part of the valves covering the openings extends from the openings and are curved so that they have a cylindrical form in cross-section. The convex side of the curved surface is turned towards the plate so that the valves begin to open by rolling of the surface over the plate. The closing moment on the valve increases as it opens, so that stable operation over a wide range of loadings is achieved. The valve has a low press. loss in the just-open as well as the fully open position, making it suitable for operations carried out under vacuum.