| 摘要 |
A bleed flow valve for venting air from a blood pressure cuff includes a valve body having an axially extending central bore. The central bore has a transition section, a fluid inlet port opening into the central bore upstream of the transition section and a fluid outlet port opening into the central bore downstream of the transition section. A piston is disposed within the central bore of the valve body and is axially translatable within the central bore of the valve body. An annular orifice is defined between an outer circumferential surface on the piston and the transition section of the central bore. The bleed valve is self-compensating as the pressure within the cuff decreases in that the piston self adjusts axially within the central bore to adjust the area of the annular orifice so as to maintain a relatively constant cuff pressure change rate throughout the deflation process.
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