| 摘要 |
A check valve adapted for use in one end of a filter cartridge to permit steam sterilization downstream of the cartridge without disintegrating the filter material. The valve has a generally cylindrical housing, a cap adapted to fit within the housing and an O-ring adapted to fit around said cap under tension. The housing has a shoulder extending inwardly from its inside circumferential surface. The cap having an upper, generally cylindrical portion with a diameter less than the inside diameter of the housing at the shoulder, a circumferential recess adapted to house said O-ring out of contact with the inside surface of said housing and a lower generally cylindrical shelf with a diameter greater than the inside diameter of the housing at the shoulder, the recess being located between said upper and lower portions.
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