| 摘要 |
A wastewater drain control for fluid compartments has a waste water discharge port in the bottom thereof and in communication with a vertical drain pipe. A valve seat element is in the pipe below the port and has an inclined annular valve seat surface and a center opening. A spherical valve element has a diameter greater than the center opening in the valve seat surface and is adapted to close the center opening to fluid flow when dwelling on the valve seat element above the center opening. A valve stem is rigidly secured by an upper end to the spherical valve element. The lower end extends downwardly through the center opening and terminates in a lower end. This lower end is connected to a linkage assembly which extends through a seal element in the vertical pipe and extends to a remote location accessible in the environment of the fluid compartment. Operation of the linkage moves the valve stem and the spherical valve upwardly or downwardly to engage the spherical valve element into or out of contact with the valve seat surface to open or close the fluid flow through the center opening. A strainer element extends across the port in the bottom of the fluid compartment to prevent large particulate matter to flow into the drain pipe. The strainer is held in place by a plurality of resilient vertical rods which extend downwardly from the strainer for engagement in an annular groove within the drain pipe.
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