| 摘要 |
<p>PURPOSE: A pilot type three-position switching valve is provided to simplify a control program of a pilot valve because a spool is switched in a first communicated state and a second communication state by controlling pilot fluid pressure. CONSTITUTION: A pilot type three-position switching valve comprises a valve body(10), a valve hole(15), a spool(16), a first piston(17), a second piston(18), and a return spring. The valve body has multiple ports. The valve hole is communicated with the ports inside the valve body. The spool is accommodated inside the valve body to be axially slid and has three switching positions. A first piston and a second piston are installed both ends of the spool, respectively. The first and second pistons switch the spool at the first and second switching positions by applying pilot fluid pressure.</p> |
