| 摘要 |
<p>A four-way slide valve including an elongated valve body having an inlet port, an outlet port, and two working ports. A slide assembly within the body is movable longitudinally to alternatively interconnect the outlet port with one or the other of the working ports. The slide assembly carries two longitudinally spaced-apart first and second pistons which define first and second chambers between the pistons and their respective ends of the valve body. Passageways within the slide assembly provide communication between the first chamber and the outlet port, and a control device, such as a pilot valve within the valve body, selectively provides communication between the second chamber and either the inlet port or the outlet port, so as to cause the slide member to move to one of its extreme positions or the other. The first piston is smaller than the second piston, the first chamber is in constant communication with the outlet port, and the region between the pistons is in constant communication with the inlet port. The movable armature of a solenoid actuator acts directly upon the pilot valve within the slide valve body, the movement of the armature in one direction causing movement of the slide assembly in the opposite direction. A slide member forming part of the slide assembly, slides upon a flow plate which contains the outlet and working ports, the face of the slide member opposite the flow plate being in communication with the outlet port.</p> |
