F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
F16K15/00—Check valves
F16K15/14—Check valves with flexible valve members
F16K15/144—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery
F16K15/145—Check valves with flexible valve members the closure elements being fixed along all or a part of their periphery the closure elements being shaped as a solids of revolution, e.g. cylindrical or conical