Importance

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Abstract

An improved pressure control valve for a medical device having a hydraulic system comprises a valve housing having an open top and a bottom and an inwardly directed shoulder partially closing the top. A poppet with an upwardly extending stem is mounted in the housing between the top and the bottom. The poppet has a sealing edge mounted on its top about the stem, and there is a calibrated spring urging the poppet towards the open top of the housing so that the sealing edge is in sealing contact with the underside of the shoulder thus closing the valve. The poppet has an internal passage extending therethrough from an inlet in the bottom of the base of the poppet to an outlet in the side of the stem. The outlet in the stem is normally closed by an elastic band which is circumferentially positioned about the stem. The valve can be opened by exerting sufficient force upon the stem or top of the poppet to compress the spring or by a fluid pressure in the internal passage in the poppet which deflects the elastic band so that it no longer closes the outlet of the internal passage.

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First Claim