| 摘要 |
PURPOSE:To make a main valve body self-sustainable stably, by furnishing, between a poppet type main valve and a pilot, a rod with a pair of latching parts, and an overtravel spring between the rod with the latching members and the main valve body. CONSTITUTION:By making balls 23,... of a self-sustaining mechanism 21b geared with the latching parts 28b of a rod 25b, an overtravel spring 33b is contracted slightly. On the other hand, by making balls 23,... of a self-sustaining mechanism 21a geared with the latching parts 27a of a rod 25a, an overtravel spring 33a is extended and the enforced power does not act to a main valve body 18. As a result, the main valve 18 is squeezed to a valve seat 18a by the enforced power of the overtravel spring 33b. Consequently, even though the fluid pressure of a pilot room 37b is reduced, the main valve body 18 links the flow route between ports A and R, while self-sustains the converting position to cut off the linking between ports P and A.
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