Accession Number : ADD003700

Title :   Expandable Element Check Valve.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Reed,Edgar A , III ; Koper,Kenneth T ; Vaders,Dennis H

Report Date : 23 Nov 1976

Pagination or Media Count : 5

Abstract : A Check valve is secured to the base of an air deployable ram-air inflatable bag attached in the crown of a parachute or decelerator. Upon descent, air is forced through an orifice in the valve thereby opening a flapper and inflating the bag while decelerating the downward velocity of a sonobuoy attached to the decelerator. Upon water entry, water flows into the bag and expands a sponge positioned in the valve thereby forcing the flapper against the oriffice and preventing the escape of trapped air from the bag during low frequency vertical oscillation in a static floating position. (Author)

Descriptors :   *Patents, *Check valves, *Inflatable structures, *Buoys, Air drop operations, Floating bodies, Buoyancy, High frequency, Vertical orientation, Oscillation, Deceleration, Orifices, Sonobuoys, Water entry, Static tests

Subject Categories : Marine Engineering
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE