Check valve for vacuum sewage pipe and vacuum sewage system
AssigneeEbara Corporation
InventorsOsamu Shimizu, Yuji Hiroto, Keisuke Ikeda, Fuyuki Ogaki
Life of this patent
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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.
Claims9
A check valve for use in a vacuum sewage pipe, said check valve comprising:
- a body having a sewage inlet and a sewage outlet to be coupled to the vacuum sewage pipe;
- a flap valve element disposed in said body and rotatably supported by a first shaft to prevent a backward flow of sewage;
- a pressing member coupled to said first shaft and rotatable about said first shaft independently of said flap valve element to press against said flap valve element;
- and
- a second shaft connected to said pressing member and movable inward and outward relative to said body to define an angle of said pressing member,
- wherein said second shaft has a thread groove capable of being engaged with a fastening member disposed on said body, and
- wherein said pressing member is locked at a lowermost position by engagement between said fastening member and said thread groove to keep said flap valve element in a closed state to allow said flap valve element to function as a gate valve that blocks off a flow of sewage.
Dependencies are inferred from the claim text.