Electrically actuated valve having two ways and three positions

摘要

An electrically actuated valve includes a first working way and a second working way and a poppet configured for providing a seal on a valve seat set hydraulically between the first working way and the second working way. The poppet includes a first operating position, a second operating position, and a third operating position, and is displaceable by an electrical-actuation device
In the first operating position, a passage area for a hydraulic fluid defined between said valve seat and said poppet has a maximum valueIn the second operating position, the passage area is partialized and has a value lower than said maximum valueIn the third operating position, the poppet is in contact with the valve seat, and the passage area has a substantially zero value, so that the first working way is isolated from the second working way.

主权项

1. An electrically actuated valve including:
a first working way and a second working way and a poppet configured for providing a seal on a valve seat set hydraulically between the first working way and the second working way, the poppet including a first operating position, a second operating position, and a third operating position, and being displaceable by means of an electrical-actuation device, wherein:
in the first operating position, a passage area for a hydraulic fluid defined between said valve seat and said poppet has a maximum value;in the second operating position, said passage area is partialized and has a value lower than said maximum value; andin the third operating position, said poppet is in contact with said valve seat and the passage area has a substantially zero value so that the first working way is isolated from the second working way, wherein:
the poppet is displaceable from the first operating position to the second operating position by means of a first electrical command imparted to said electrical-actuation device against the resisting action of a first elastic element; andthe poppet is displaceable from the second operating position to the third operating position by means of a second electrical command imparted to said electrical-actuation device against the resisting action of said first elastic element and of a second elastic element; andsaid poppet hydraulically balanced and including a head having a hollow cylindrical shape, and a shank integral with the head and having a diameter smaller than that of the head in such a way as to define a shoulder at an interface between said head and said shank, and the shoulder comprising a ring of through holes providing fluid communication between a cavity within the head of the poppet and an opposite side of the shoulder.