| 摘要 |
A flow selector and regulator for use in an I.V. administration arrangement which includes the capability of establishing the flow rate without calibration at the time of use and then automatically maintaining that flow rate regardless of changes in fluid pressure in either or both of upstream or downstream of the regulator. The regulator utilizes a diaphragm which is not subject to stretching or material stress prior to use to control an orifice. The regulator is capable of being calibrated at the time of manufacturer directly in terms of flow rate, something which is not possible in prior such devices. The diaphragm is clamped at the rim and has an arcuate torus facing the inlet and a bulbous central section which controls flow through an outlet orifice. Liquid bypasses the diaphragm through the rim. Other embodiments incorporate the regulator into a drip chamber and reduces the number of parts of the regulator to three members which can be snapped together.
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