| 摘要 |
A directional control valve having a valve body with four ports equally spaced around a common axis, a wide land seal assembly in diametrically opposite ports and a movable valve disc mounted for rotary motion on one face of the valve body, the valve disc includes a pair of passages having openings positioned to engage the ports, check valves are provided in each of the passages to limit fluid flow to one direction through the passages, and a central passage for bypassing fluid through the valve body. The wide land seal assemblies each include a metal seal disc having a tapered flange on one side and a resilient sleeve bonded to the flange to seal the assembly in the port and to bias the metallic disc against the valve disc.
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