| 摘要 |
<p>PURPOSE: To provide a pilot valve whereby the service life of pistons driving a valve element can be prolonged and made compact. CONSTITUTION: Piston boxes 11 and 12 are installed on both sides of a valve main body 4 of a main valve 1 which is provided with multiple ports and an axial valve hole 6, and protruded parts 13a and 15a extending to the valve hole are installed in cylinder chambers 13 and 15 which are provided in the piston boxes 11 and 12. Also pressing parts 14a and 16a which press a valve element 9 and recessed parts 14b and 16b on which the protruded parts slide are provided are provided on pistons 14 and 16 so as to guide the sliding of the pistons by the relative sliding movement of these protruded and recessed parts. Thus the service life of an active valve can be prolonged and made compact because it is not inclined even if the width of the pistons in sliding direction is small.</p> |
