| 摘要 |
An improved valve utilizes a ball or sphere positioned within a housing which is movable by source of magnetic force external to the housing, the housing having a fluid inlet and a fluid outlet, and a sealing member positioned within the housing adjacent the fluid inlet or the fluid outlet. A modular control valve apparatus is provided having at least one or a plurality of valves in the housing, each having a fluid inlet and a fluid outlet, and a passage from a source of fluid or aspiration to an instrument or other device to direct and/or utilize the fluid or aspiration. Control is provided by including one or more pressure monitors, such as diaphragms positioned in recesses in a surface of the housing, coupled to passageways connected to passageways leading to fluid flow conduits. Variations in pressure in the conduits are transmitted from the diaphragm to a sensor such as a transducer to generate a signal, which activates a correcting electronic circuit which in turn controls a pump for a vacuum system. Provision is made to prevent contamination of the monitoring system by providing a hydrophobic filter between each passageway leading to the conduit and the diaphragm. |
