Patent ID: 6386133
Filing Date: 2002-05-14
Classification: B63G,F16K,F41F

Abstract:
An apparatus for selectively covering an undersea door of a vessel comprising:a shutter pivotally mounted at one end of the vessel structure for selectively covering the undersea door, said shutter having at least one lateral aperture with an associated first aperture in communication with said lateral aperture, each said lateral aperture and first aperture combination extending through said shutter; and a two-way valve disposed in each said lateral aperture, said two-way valve comprising: a retaining ring secured in said lateral aperture in said shutter and having a second aperture extending therethrough; a central portion having an annular rim portion disposed in said lateral aperture of said shutter, a first end portion at one end of said central portion provided with a first end surface extending in said first aperture in said shutter, and second end portion at the opposite end of said central portion provided with a second end surface extending in said second aperture; a first biasing spring in said lateral aperture between said shutter and a first side of said annular rim portion; and a second biasing spring in said lateral aperture between a second side of said annular rim portion and said retaining ring, said first and second biasing springs holding said first end surface coplanar with a top surface of said shutter and said second end surface coplanar with a bottom surface of said shutter to prevent generation of objectionable levels of flow noise.