Accession Number : AD0444483


Title :   PRELIMINARY TESTS OF THE STEPHENSON VALVE - 2ND REPORT


Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA


Personal Author(s) : Stephenson, J M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/444483.pdf


Report Date : 05 Jul 1964


Pagination or Media Count : 21


Abstract : The Stephenson blast valve consists essentially of a resilient media in a steel tube or other blast resistant container. To study the capability of the valve, numerous tests were made on different resilient media with respect to their resistance to air flow, blast attenuation and dust arrestance. The most successful media was a combination of non-porous polyure thane cylinders and cylinders of the same material and size with a porosity of 20 pores per inch. The ratio was 1:1 and the depth 12 inches. The air flow was 103 cfm through an 8-indh tube, or about 300 cfm per square foot, with an air resistance of 1-inch water. When subjected to an overpressure of 76 psi with a duration of 2 seconds, the initial impulse in the surge chamber was 0.25 lb sec/sq inch. The performance of the media as a prefilter was excellent. A problem in the use of the media as tested was its tendency to remain in a semi-compressed condition after being subjected to a high overpressure. The cylinders appeared to be too large for the 8-inch dia. tube.


Descriptors :   *VALVES , *BLAST , PRESSURE , ATTENUATION , GAS FILTERS , POROUS MATERIALS , ISOCYANATES , GAS FLOW , DUST , AIR , FRICTION


Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs


Distribution Statement : APPROVED FOR PUBLIC RELEASE