| 摘要 |
A pulse width modulated solenoid valve having a housing and includes a pole member including a pole piece extending axially inwardly of the housing, and a transverse wall extending radially outwardly into engagement with a peripheral wall. 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. A plurality of circumferentially spaced passages extend from adjacent the periphery of the ball through the axial extension of the housing at an acute angle to the axial opening in the axial extension to the periphery of the housing. 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 holds the ball against the second seat and prevents flow through the axial opening in the insert permitting communication about the ball and first 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 angular passages defined to the exterior of the axial extension. |
