Accession Number : ADD017569

Title :   Multistage Variable Area Throttle Valve.

Descriptive Note : Patent, Filed 27 Jun 94, patented 16 May 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Shiffler, Mark E ; Morris, Joseph H

Report Date : 16 May 1995

Pagination or Media Count : 9

Abstract : A throttle or fluid control valve uses at least one compressible multi-wave washer as a fluid control element. The apertures formed by the multi-wave washer are short and of low aspect ratio when the valve is fully open to limit pressure drop across the valve, thus substantially preventing cavitation and flow related noise to high flow velocities. As the valve is closed, the aspect ratio of the apertures increases but surfaces of the apertures remain angled to each other to provide noise cancellation and damping. Several multi-wave washers spaced by sliders are preferably used to further limit pressure drop in any stage and to form a serpentine path in the general direction of flow to provide further noise cancellation and damping. The sliders also enhance the self purging action of the valve structure. A closure structure is also provided for assuring full closure of the valve.

Descriptors :   *VALVES, *FLUID CONTROL, *WASHERS(SPACERS), *PATENTS, THROTTLING, CLOSURES, HIGH RATE, HIGH VELOCITY, DAMPING, REDUCTION, PRESSURE, APERTURES, ASPECT RATIO, CAVITATION, PURGING

Subject Categories : Hydraulic and Pneumatic Equipment
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE