1) Eccentric rotary valve structure and use features Eccentric rotary valve, also known as cam deflection valve, is the development of new varieties in the 70s, with the eighties. Its working principle is an eccentric rotation of the fan-shaped ball valve, the use of eccentric spherical crown and seat tangent, open, the ball off the seat; close, the core gradually contact with the seat, the ball on the seat pressure. Its features are: (1) spherical pressure on the seat, easy to damage the crystallization of the material, suitable for crystallization, tibia and dirty media occasions. Caustic soda valve is the use of this feature design. (2) simple flow path, Kv value, "self-cleaning" performance is good. (3) valve body is small, light weight. (4) Proportional adjustment, the implementing agencies need to bring locator, if only two control, the more significant advantages. (5) Seal has a hard seal, soft seal for selection. From the reliability considerations, the authors recommend the use of hard seal (surfacing wear resistant alloy). 2) the use of eccentric rotary valve instructions The valve than the single-seat valve, double seat valve, sleeve valve has more advantages, it is used more widely. However, it uses the clamp flange, the installation is not convenient; the same time, the valve reliability and weight than the full-featured ultra-light control valve, it is recommended to use full-featured ultra-light control valve (with butterfly valve, V-ball valve, eccentric valve The common advantages) excellent.
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