| 摘要 |
<p>PURPOSE:To favorably switch a passage by giving snap action to a plunger for communicating a port in common use with one of alternative ports by air pilot pressure. CONSTITUTION:A port casing 11b is provided with a port in common use communicating with a control chamber 17 and two alternative ports 21, 22. A plunger 12 always closes the alternative port 21 by a compression spring 25 until the pilot pressure amounts to a fixed value, and opens the alternative port 22. When pilot pressure is applied, a valve seat 23 separates from a passage 21c so that the plunger 12 instantaneously reaches the rising end. Accordingly, passages can be switched instantaneously.</p> |
