| 摘要 |
A fail open three-way solenoid actuated valve is disclosed including a body having an internal chamber including an inlet section and first and second outlet sections, a first valve seat formed in the internal chamber defining a valve port between the inlet section and the first outlet section of the internal chamber, a second valve seat formed in the internal chamber defining a second valve port between the inlet section and the second outlet section of the internal chamber and a valve spool extending through the first valve port of the internal chamber, the valve spool having a stem slidably received in a central bore formed in the body. The valve spool includes a rod having first and second ends with the first end being secured to the stem, a retainer secured to the second end of the rod with the retainer including first and second sealing surfaces and a sealing member concentrically positioned on the rod adjacent the retainer, the sealing member being longitudinally moveable along the rod and includes an inner valve seat for cooperating with the first sealing surface and a sealing surface for cooperating with the first valve seat. The valve further includes an actuator for displacing the valve spool between first and second sealing positions and a dislodging mechanism for contacting the sealing member when movement from the first sealing position toward the second sealing position is commenced such that the first sealing surface contacts the inner valve seat and the sealing surface contacts the first valve seat when the valve spool is displaced by the actuator to the first sealing position to seal off fluid communication between the inlet section and the first outlet section.
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