SOLENOID VALVE

摘要

A pulse width modulated valve comprising a valve housing including a transverse wall, an integral extension extending axially from the transverse wall and an integral peripheral wall extending axially from the periphery of the transverse wall in a direction opposite to the direction in which the axial extension extends. The solenoid valve also includes a pole member including a pole piece extending axially inwardly of the housing, an integral transverse wall extending radially outwardly into engagement with the peripheral wall and connected thereto. The pole piece has an axial opening therethrough and defines a first conical seat. The axial extension of the housing has an axial opening aligned with the opening of the pole. An insert is positioned in an axial opening in the axial extension and defines a second seat. A ball is interposed between the first and second seats and has limited movement between the seats. A spring yieldingly urges the ball into engagement with the second seat. The insert has portions thereof spaced from the walls of the opening into which the insert extends defining passages to the exterior of the axial extension. The housing and pole member define an annular space and a coil assembly is positioned in the annular space, such that when fluid is applied to the axial opening in the insert and the coil is de-energized, the spring mean holds the ball against the second seat and prevents flow through the axial opening in the insert while permitting communication between the passages defined by the insert about the ball and second seat through the axial opening in the pole and when the solenoid is energized, the ball is drawn toward the first seat to close communication to the axial opening in the pole and permit flow from the axial opening in the insert past the second seat and through the passages defined by the insert to the exterior of the axial extension.