Accession Number : AD0894624

Title :   Non-Return Valve: Redesign of.

Descriptive Note : Final rept.,

Corporate Author : NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL

Personal Author(s) : Willoughby, P. L. ; Kohl, O. A.

Report Date : 12 JAN 1956

Pagination or Media Count : 28

Abstract : This project was originally established for the purpose of modifying the standard diver's non-return valve to overcome three objections: (1) the upper valve stem guide, in some cases, became deranged to the extent of binding the valve stem; (2) manufacturers were unable to provide a valve which would meet current specifications, i.e.: open with less than one psi and seat with any back pressure from 2-inches of water to 350 psi; and (3) the standard stem washers could not be readily replaced in the field. Subsequent to the commencement of work on this project, a new valve was received from bureau of Ships, Code 588. This valve was evaluated and certain modifications were made on it. This report describes the modifications made to both valves and covers the objective and subjective tests conducted. Objective test results are tabulated and/or graphically illustrated. (Author)

Descriptors :   (*BREATHING APPARATUS, SCUBA DIVERS), (*PNEUMATIC VALVES, BREATHING APPARATUS), UNDERWATER EQUIPMENT, EXHAUST VALVES, HIGH PRESSURE VALVES, GASKETS, HALOCARBON PLASTICS, HARDNESS, SPRINGS, O RINGS, SMOKE, GAS FLOW, PRESSURE BREATHING, NAVAL EQUIPMENT, MODEL TESTS, ACCEPTABILITY.

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE