| 摘要 |
PURPOSE:To reduce a stroke of a switch valve without requiring a complicated pilot valve by dividing a hollow section of a four way valve body and driving switch valves interlocked with the second chamber and the fourth chamber by means of a plunger and an electromagnetic coil. CONSTITUTION:A four way valve body 5 is divided into five chambers 5a-5d, switch valves 10, 11 are provided in the second chamber 5b and the fourth chamber 5d, and a plunger 13 is fitted to an action shaft 12. When a coil 4 is not energized, the plunger 13 is pushed down by means of its weight and a rebounding force of a spring 5, and the switch valves 10, 11 close passages between 5b and 5c and between 5d and 5e. Next, when the coil 4 is energized, the switch valves 10, 11 close passages between 5a and 5b and between 5c and 5d. In the above action mechanism, the moving direction of the switch valves 10, 11 is at a right angle to pipes A-D, therefore the moving distance can be reduced irrespective of the pipe diameter. |
