Accession Number : AD0433751


Title :   LINEAR PROPORTIONAL CONTROL HOT GAS VALVE FOR SECONDARY INJECTION,


Corporate Author : PICATINNY ARSENAL DOVER N J AMMUNITION ENGINEERING DIRECTORATE


Personal Author(s) : Lehman,W F ; Crommie,F P


Report Date : Feb 1964


Pagination or Media Count : 40


Abstract : Two linear proportional control hot gas valves were tested as an integral component of a liquid rocket chamber bleed system. One valve relied entirely on the refractory metal, tantalumtungsten alloy (Ta-10W), whereas the second valve used an arrangement of internal heat sinks, ceramic insulators and ablative plastic inserts to serve as thermal protection for the tungsten surfaces of the critical components. The refractory metal valve failed after three seconds of operation due to severe degradation of the Ta-10W alloy components. In contrast, the composite materials valve successfully completed four 12 sec duration tests, representing 48 sec of accumulative throttling operation without any parts replacement. The valve demonstrated excellent structural durability and reproducible control capability during cyclic throttling. It is firmly believed this design is capable of at least 20 sec of continuous throttling operation under the design mass flows of 5140 F combustion gases. (Author)


Descriptors :   PNEUMATIC VALVES , SECONDARY INJECTION , LIQUID PROPELLANT ROCKET ENGINES , HIGH TEMPERATURE , SCIENTIFIC RESEARCH , REFRACTORY METAL ALLOYS , TUNGSTEN ALLOYS , TUNGSTEN , EXHAUST GASES , EXHAUST VALVES , CONSTRUCTION , ENVIRONMENTAL TESTS , PERFORMANCE(ENGINEERING) , CERAMIC MATERIALS , PLASTIC SEALS , ABLATION , EROSION , THERMAL INSULATION , BLEED SYSTEMS , COMPOSITE MATERIALS


Distribution Statement : APPROVED FOR PUBLIC RELEASE