Electrically operated hydraulic valve

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

Patent

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Details

F16K 31/08 (2006.01) H01F 7/06 (2006.01) H01F 7/16 (2006.01)

Patent

CA 2651439

An electrically operated hydraulic valve comprises a valve assembly that provides a common valve passageway, an inlet port (20), an outlet port (22) and a return port (23) connected to the passageway and an axially movable valve device (8, 15; 33) which allows in a first position fluid flow between the outlet port and the return port while closing the inlet and in a second position, axially displaced from the first position, fluid flow between the inlet port and the outlet port while closing the return port. A spring (13; 34) provides a restoring force urging the valve device to its first position. An electrically operated actuator (19) coupled to the valve device comprises a permanent magnet (24) and a cooperating electrical coil (25) having an associated magnetic core, one or other of the magnet and the coil constituting a stator and the other constituting an armature which is coupled to the valve device to move it from the first position to the second position. The actuator is disposed for operation by an electrical supply which provides a unidirectional current pulse to the coil.

La présente invention concerne une valve hydraulique à commande électrique, comprenant un ensemble de valve qui fournit un passage de valve commun, un orifice d'entrée (20), un orifice de sortie (22) et un orifice de retour (23), reliés au passage, et un dispositif de valve (8, 15; 33) à déplacement axial qui, dans une première position, permet au liquide de s'écouler entre l'orifice de sortie et l'orifice de retour tout en fermant l'entrée et qui, dans une seconde position axialement déplacée par rapport à la première position, permet au liquide de s'écouler entre l'orifice d'entrée et l'orifice de sortie, tout en fermant l'orifice de retour. Un ressort (13; 34) exerce une force de rappel qui ramène le dispositif de valve à sa première position. Un actionneur (19) à commande électrique, couplé au dispositif de valve, comprend un aimant permanent (24) et une bobine électrique coopérante (25) ayant un noyau magnétique associé, l'un ou l'autre (aimant ou bobine) constituant un stator, et l'autre constituant une armature qui est couplée au dispositif de valve pour le déplacer de sa première position à sa seconde position. L'actionneur est disposé de manière à être commandé par une alimentation électrique qui fournit une impulsion de courant unidirectionnel à la bobine.

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