Patent Number: 8,028,715

Title: Check valve for vacuum sewage pipe and vacuum sewage system

Abstract: The present invention provides a check valve for use in a vacuum sewage pipe. The check valve includes a body having a sewage inlet and a sewage outlet to be coupled to the vacuum sewage pipe, a flap valve element disposed in the body and rotatably supported by a first shaft, and a closing mechanism. The closing mechanism can keep the flap valve element in a closed state so as to allow the flap valve element to function as a gate valve. The closing mechanism can also limit an opening degree of the flap valve element so as to allow the flap valve element to function as a check valve.

Inventors: Shimizu; Osamu (Tokyo, JP), Hiroto; Yuji (Tokyo, JP), Ikeda; Keisuke (Tokyo, JP), Ogaki; Fuyuki (Hokkaido, JP)

Assignee: Ebara Corporation

International Classification: F16K 35/00 (20060101)

Expiration Date: 2019-10-04 0:00:00