noun
: an automatic valve in which a lightweight thin disk, strip, or ribbon is constrained to move between the valve seat and valve cover according to variations in fluid pressure on its sides
noun
: an automatic valve in which a lightweight thin disk, strip, or ribbon is constrained to move between the valve seat and valve cover according to variations in fluid pressure on its sides
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012