| 摘要 |
<p>A sterile liquid dispensing valve includes a hollow body having an inlet, an outlet, and inner and outer seats adjacent to the inlet and outlet respectively; an outer closure member; a manual or automatic actuator for advancing or retracting such outer closure member to engage or disengage, respectively, the outer seat; an inner closure member surrounding and slidable relatively to the outer closure member; a helical compression spring surrounding the outer closure member and compressed between the body and inner closure member; and an electrical resistance wire coiled around the outlet and outer seat for heating the same. The spring normally biases the inner closure member to engage the outer closure member for movement therewith, but the inner and outer seats are spaced so that the inner closure member is seated before the outer closure member to ensure closing of the former. The hot wire sterilizes the outlet and vaporizes liquid which may be trapped between the seated inner and outer closure members, whereby such vaporized liquid can escape by forcing the inner closure member to disengage the inner seat against the spring bias.</p> |
