On/off valve capable of drawing back fluid when closed

Details On/off valve capable of drawing back fluid when closed On/off valve capable of drawing back fluid when closed

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 23/00 (2006.01) B05B 5/04 (2006.01) B05B 5/16 (2006.01) B05B 12/14 (2006.01) B05B 3/10 (2006.01) B05B 7/08 (2006.01)

Patent

CA 2106326

An OFF/OFF valve including a fluid passage formed in the valve body (51), and having a valve seat (55), a smaller diameter portion (56) extending from the valve seat (55) on a downstream side of the valve seat (55), and a larger diameter portion (57) extending from the smaller diameter portion (56) on a downstream side of the smaller diameter portion (56). A valve element (58) is disposed so as to be movable between a position adjacent the valve seat (55) and a position within the larger diameter portion (57). The valve element (58) is driven by a valve element driving assembly. When the valve is closed, the valve element (58) moves toward the valve seat (55). When the valve element (58) moves within the smaller diameter portion (56), the fluid which has passed through the valve element (58) is drawn back due to the pumping effect of the valve element (58) before the valve element (58) finally reaches the valve seat (55) and the valve is completely closed.

Robinet OFF/OFF comprenant un passage de fluide dans le corps du robinet (51) et un siège de robinet (55), une portion de plus faible diamètre (56) qui part du siège de robinet (55) du côté aval du siège de robinet (55) et d'une portion de plus grand diamètre (57) qui part de la portion plus réduite (56), du côté aval de la portion de plus faible diamètre (56). Un élément de robinet (58) est installé de manière à pouvoir être déplacé entre une position adjacente au siège de robinet (55) et une position se trouvant dans la portion de plus grand diamètre (57). L'élément de robinet (58) est commandé par un ensemble de commande d'élément de robinet. Lorsque le robinet est fermé, l'élément de robinet (58) se déplace vers le haut du siège de robinet (55). Lorsque cet élément (58) se déplace dans la portion de plus faible diamètre (56), le fluide qui a passé dans l'élément de robinet (58) est refoulé à cause de l'effet de pompage de l'élément de robinet (58) avant que l'élément de robinet (58) atteigne finalement le siège de robinet (55) et que le robinet ne soit complètement fermé.

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