Pressure relief valve system including a pilot valve having...

G - Physics – 05 – D

Patent

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Details

G05D 16/10 (2006.01) G05D 16/16 (2006.01)

Patent

CA 2396303

A pressure relief valve system is provided with particular application for use in conjunction with a pressurized system containing an incompressible fluid. The system includes a main pressure relief valve (12) in communication whith the pressurized system and a pilot valve (10) in communication with said main pressure relief valve (12). The pilot valve (10) includes a pilot valve body (34); a pressure chamber that is always in communication with the system pressure; and a sense piston (38) reciprocal in the pilot valve body (34) and which is exposed to the pressure in the pressure chamber. A damper is provided on the sense piston (38) to improve control of the opening and closing of the valve system. A Preferred damper includes at least one labyrinth damping ring (39) that extends downward from the sense piston (38) and is adapted to engage with an upwardly extending damping ring (41) on a hydraulic damping plate (40).

L'invention concerne un système de soupape de retour prévu pour être utilisé avec un système sous pression contenant un fluide incompressible. Ce système comprend une soupape de décharge principale (12) en communication avec le système sous pression et une soupape pilote (10) en communication avec la soupape de décharge principale (12). Cette soupape pilote (10) comprend un corps de soupape pilote (34) ; une chambre sous pression communiquant toujours avec la pression du système, un piston directionnel (38) animé d'un mouvement alternatif dans le corps de soupape pilote (34) et qui est exposé à la pression dans la chambre sous pression. Un amortisseur est prévu sur le piston directionnel (38) pour améliorer la commande de l'ouverture et la fermeture du système de soupape. Un amortisseur préféré comprend au moins une chicane (39) qui s'étend vers le bas à partir du piston (38) et est adaptée pour se mettre en prise avec une bague (41) s'étendant vers le haut sur une plaque d'amortissement hydraulique (40).

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