31. These are simple poppet valves, operating by direct float action and sealing against the upper valve seat. 32. She is his " petty-pie "; he is her " poppet ." 33. The rocket is fired when the computer sends direct current through a small electromagnet that opens the poppet valve. 34. Abigail denies Mary's assertions that they are pretending, and stands by her story about the poppet . 35. By 1939 No . 2001 had had its rotary-cam poppet -valve valvegear replaced with Walschaerts gear. 36. Poppets have historically been used to place curses on other members of a community for religious or traditional purposes.37. Early designs used the D slide valve but this has been largely superseded by Piston valve or Poppet valve designs. 38. Use of poppet valves also increased the speed because they gave very accurately-timed steam delivery to the cylinders. 39. Additionally, smaller valve openings and longer opening times makes them less gas efficient than their poppet -valve counterparts. 40. The poppet valves were not a great success and they all reverted to piston valve engines between 1931 and 1934.
