초록 ▼

In a solenoid-controlled valve assembly a biasing means (21) is adapted to apply a resisting force to a spool (22) in a direction opposite to the direction substantially of a force applied by an armature (14), and engagement between at least one of the spool and the biasing means and the spool and t

In a solenoid-controlled valve assembly a biasing means (21) is adapted to apply a resisting force to a spool (22) in a direction opposite to the direction substantially of a force applied by an armature (14), and engagement between at least one of the spool and the biasing means and the spool and the armature is through an engagement means defining a single point of contact. The spool (22) may be provided with at least one land adapted to connect and disconnect two flow passages (6, 8), and the first ends of the two passages are spaced apart in a direction parallel to the axis of the bore by a smaller distance than the spacing between the second ends of the passages.

대표청구항 ▼

1. A solenoid-controlled valve assembly comprising a body defining a bore, a spool working in said bore in said body, at least a first flow passage and a second flow passage defined in said body, each said passage connecting at one end with said bore, movement of said spool within said bore connecti

1. A solenoid-controlled valve assembly comprising a body defining a bore, a spool working in said bore in said body, at least a first flow passage and a second flow passage defined in said body, each said passage connecting at one end with said bore, movement of said spool within said bore connecting and disconnecting said first and second flow passages, a solenoid comprising a coil fixed relative to said body and an armature, wherein application of a current to said coil causes said armature to apply a force in a first direction to said spool, and a biasing means arranged to apply a resisting force to said spool in a second direction opposing said force applied by said armature, and wherein engagement between at least one of said spool and said biasing means and said spool and said armature is through an engagement means comprising a ball defining a single point of contact, and a cup which sits in an end of said biasing means and provides a surface defining a recess which engages said ball at a center portion.