| 摘要 |
<p>A pneumatic valve is disclosed in which a slide or spool is longitudinally shiftable between two operative positions. The slide is positioned within a body chamber with substantial clearance, and is laterally located within such chamber by elastomeric seals. A balanced valve system is carried by the slide and operates without applying any substantial lateral forces to the slide so that the elastomeric seals can maintain the lateral position of the slide. A manifold assembly formed with grooves open to one face which connect selective ports in the manifold is combined with a valve plate bonded to such face of the manifold block to cooperate with the grooves to form closed passages and to provide the valving surface against which the slide-carried valve elements operate. Because of the high clearance, the valve can operate even when substantial amounts of contamination enter the valve. The valve is also structured to facilitate automatic flushing of contamination from the valve.</p> |
