POPPET AND SEAT DESIGN DATA FOR AEROSPACE VALVES
Final rept. Apr 64-Feb 1966
ROCKETDYNE CANOGA PARK CA
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Presented herein is a description of the work accomplished in providing fundamental sealing data on metal-to-metal seat and poppet valving elements. The reported effort supplements and updates initial results published as Technical Documentary Report No. RPL-TDR-64-68, Rocket Engine Valve Poppet and Seat Design, dated May 1964. The program involved experimental and analytical studies of the detailed aspects of valve seating. Flat, conical, and spherical test models were fabricated with particular emphasis placed on documentation of fabrication methods and description of the resultant surfaces. Model stress-leakage characteristics, as a function of surface texture, geometry, coatings, and material variations, were experimentally investigated. The resulting information is presented in graphical form supported by inspection evidence from which test surface condition and features were deduced. Mathematical models relating surface texture and resulting deformation characteristics are formulated to provide understanding of the leakage path closure mechanism and extrapolation of experimental stress-leakage data. Additionally, cyclic effects on model sealing capabilities were investigated. A simplified analysis relating tester and model configuration with anticipated dynamic loading characteristics is developed and further extended by digital programming techniques. A high degree of correlation was obtained between the analytical predictions and the test results.
- Pumps, Filters, Pipes, Tubing, Fittings and Valves