| 摘要 |
PROBLEM TO BE SOLVED: To provide a overflow preventing valve preventing an occurrence of a turbulent flow directly beneath a valve element in a normal flow state for minimizing flow resistance of passing fluid, capable of long term usage without causing malfunction of the valve element, and capable of cutting off a flow of fluid without delay in an emergency such as pipe breakage. SOLUTION: In this overflow preventing valve, when a downstream side pressure inside a pipe with flowing fluid abnormally drops, the valve element abuts to a valve seat for cutting off passage of the fluid, and it is characterized by that, during normal flowing, the valve element is supported by a support part so that a part of the valve element covers a perspective cross section of the valve seat and the valve element is energized by an elastic member in a direction separating from the valve seat, and an orifice of a valve through which the fluid passes is composed of a passage sectional area around the valve element. It is also characterized by that the valve element and the support part are composed in a relationship so that a fluid passage sectional area between a pipe inner face and the valve element and a fluid passage sectional area between the valve element and the valve seat are substantially the same or within 10% in a state of a normal flow inside the pipe.
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