Automatic back water valve system

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 3/02 (2006.01) E03F 7/04 (2006.01) F16K 31/126 (2006.01) F16K 31/163 (2006.01) F16K 35/14 (2006.01) F16K 39/06 (2006.01)

Patent

CA 2284741

A valve body (15) is formed of two half sections (16, 18) which are secured together to define a drain line passage (12) and to confine therebetween a thin gate valve (45) between a lower open position and an upper closed position. Actuator (110) includes flexible bellows (80) confined between a cylindrical wall (88) and cover (110). Valve body (15) and bellows (80) define an expandible chamber connected by a bottom port or extension line (97) to the drain line (12). If sewage water backs up, air within the fluid chamber expands bellows (80) upwardly to close valve (45). When sewage water flows from the drain line (12), bellows (80) moves downwardly due to differential pressure and top plate (102), automatically returning the valve blade (45) to its open position.

Le corps de clapet (15) est formé de deux demi-éléments (16, 18) réunis pour définir un circuit d'évacuation (12) et pour retenir entre eux un mince clapet obturateur (45), le faisant passer d'une position inférieure ouverte à une position supérieure fermée. Un actionneur (110) comporte des soufflets souples (80) positionnés entre une paroi cylindrique (88) et une enveloppe (110). Le corps de clapet (15) et les soufflets (80) définissent une chambre extensible reliée par un point de connexion inférieur ou ligne d'extension (97) au circuit d'évacuation (12). Si les eaux usées reculent, l'air se trouvant dans la chambre à fluide fait se dilater les soufflets (80) vers le haut pour fermer le clapet (45). Lorsque les eaux usées s'écoulent depuis le circuit d'évacuation (12), les soufflets (80) se déplacent vers le bas du fait de la différence de pression et la plaque supérieure (102) fait automatiquement revenir la lame du clapet (45) en position ouverte.

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