N-shaped backflow preventor

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

Patent

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F16K 15/03 (2006.01) E03C 1/10 (2006.01)

Patent

CA 2082953

A backflow preventor with increased performance, and increased ease of installation is provided. The check valves (12, 14) are configured to assist in redirecting flow along the desired pathway, when they are in the open position. The pathway is designed so that the number of changes of flow direction of the average streamline flow is reduced, preferably being about 180 degrees. The check valves (12, 14) are configured to reduce or eliminate divergent flow around the edges of the valve disks (32, 72). A check valve (12, 14) with a reduced hold-open pressure includes a biasing device, such as a spring (52,74) directly connected to a pivoting clapper (32, 72) as one end (64, 66) and to the valve body at the other end (66, 64). No intervening pivoting links are used between the spring (52, 74) and the clapper (32, 72). Preferably, the clapper (32, 72) is connected only by being pivoted (43, 43') to the valve body and by the spring (52, 74) connecting it to the valve body.

Dispositif anti-refoulement d'efficacité améliorée et d'installation plus facile. Ses clapets de retenue (12, 14) sont conçus pour aider à rediriger l'écoulement vers le passage approprié lorsqu'ils sont en position ouverte. Le passage est conçu pour limiter le nombre de changements de direction de l'écoulement moyen, ces changements d'écoulement étant de préférence d'environ 180 degrés. Les clapets de retenue (12, 14) sont conçus pour réduire ou éliminer l'écoulement divergent autour des bords des disques (32, 72) des clapets. Un clapet de retenue (12, 14) dont la pression de maintien en position ouverte est réduite comporte un dispositif de compression, un ressort (52, 74) par exemple, directement relié à un clapet pivotant (32, 72) par une extrémité (64, 66) et au corps d'une soupape par l'autre extrémité (66, 64). On ne se sert d'aucun maillon pivotant intermédiaire entre le ressort (52, 74) et le clapet (32, 72). Le clapet (32, 72) est de préférence connecté par simple pivotement (43, 43') avec le corps de la soupape et par le ressort (52, 74) qui le met en contact avec le corps de la soupape.

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