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Pressure and thermal relief valve

Image Number 2 for United States Patent #4896690.

In a thermal responsive relief valve, an elongated tubular valve body axially contains a strut secured at one end portion to the bore of the valve body and axially contained at its other end by a piston sealed with the valve body bore at one of its ends. A fusible material is interposed between one end portion of the strut and the valve member surrounding the last mentioned strut end portion.

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