| 摘要 |
A pulse width modulated valve comprising a valve housing including a transverse wall, an extension extending axially from the transverse wall and a peripheral wall extending axially from the periphery of the transverse wall in a direction opposite to the direction in which the axial extension extends. A pole piece extends axially inwardly of the housing and a transverse wall extends radially outwardly into engagement with the peripheral wall and is connected thereto. The pole piece defines a first seat, and a non-magnetic insert is positioned in an axial passage in the axial extension defines a second seat. A spring loaded ball has limited movement between the first and second seats. The insert defines passages to the exterior of the axial extension. A coil assembly is positioned in the housing. When fluid is applied to the axial passage in the insert and the coil is de-energized, the spring holds the ball against the second seat and prevents flow through an axial passage in the insert while permitting communication between the passages defined by the insert about the ball and second seat through an axial passage in the pole, and when the solenoid is energized, the ball is drawn toward the first seat to close communication to the axial passage in the pole and permit flow from the axial passage in the insert past the second seat and through the passages defined by the insert to the exterior of the axial extension.
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