Abrégé

The present invention relates to a check valve and, more particularly, to a check valve comprising a main disk and a separate auxiliary disk, the main disk making a rapid closing operation, and the auxiliary disk, which has an area smaller than that of the main disk, making a slow closing operation, thereby reducing the velocity of a reverse flow inside a conduit, right before the disks are finally closed, and preventing a slam (a characteristic phenomenon wherein, when the disks are closed with a bang, an instantaneous increase in pressure wave raises the possibility of piping fracture and causes noise and vibration) of the disks and water hammer.

Classes IPC  ?

• F16K 15/03 - Soupapes, clapets ou valves de retenue à corps de soupapes rigides guidés et élément de fermeture à charnière
• F16K 31/12 - Moyens de fonctionnement; Dispositifs de retour à la position de repos actionnés par un fluide
• F16K 47/02 - Moyens incorporés aux soupapes pour absorber l'énergie d'un fluide pour empêcher les coups de bélier ou le bruit
• F16K 47/04 - Moyens incorporés aux soupapes pour absorber l'énergie d'un fluide pour diminuer la pression, l'organe régulateur étant incorporé dans l'élément de fermeture

Abrégé

The present invention relates generally to a parallel cylinder-type check valve and, more particularly, to a parallel cylinder-type check valve in which two shock-absorbing dampers are connected in parallel to each other so as to absorb shock when a valve is closed, wherein the length of a rocker arm connected to any one shock-absorbing damper is adjusted to be longer according to the principle of a lever in order to provide a sufficient shock-absorbing effect. Also, the present invention relates to a parallel cylinder-type check valve, which is rapidly closed at a high speed at the time of the initial closing of the valve and is slowly closed at a low speed at the later closing of the valve by means of the parallel cylinder, thereby preventing noise and vibration, as well as preventing water hammer.

Classes IPC  ?

• F16K 15/03 - Soupapes, clapets ou valves de retenue à corps de soupapes rigides guidés et élément de fermeture à charnière
• F16K 47/02 - Moyens incorporés aux soupapes pour absorber l'énergie d'un fluide pour empêcher les coups de bélier ou le bruit