| 摘要 |
<p>Zero lap valve includes two cylindrical valve member portions, each having passageways intersecting a bond surface thereof, and to valve body portions, each having a cylindrical cavity with radial ports intersecting the cavity and a bond surface thereof. The bond surfaces of the valve member portions are bonded together to form a valve member having passageways in one portion bounded by the bond surface of the other portion with the passageways in the two portions interconnected. The valve member is positioned in a valve body formed by bonding the bond surfaces of the valve body portions such that common ports in both portions have adjacent ports to either side in different portions. The valve member is axially slidable perpendicular to the bond surfaces such that the bond surfaces of the ports act as metering edges in cooperation with the bond surfaces of the passageways as the passageways interconnect one or the other of the adjacent ports to the common ports. When and only when the bond surfaces of the valve member member are coplanar with the bond surfaces of the valve body, the valve member passageways will be blocked from the adjacent ports with zero lap.</p> |
