Check valve
AssigneeNippondenso Co., Ltd.
InventorsMikiji Ito, Zyunziro Yosimura
Life of this patent
Estimating the term…
Abstract
A check valve has a valve member seated on a separating wall member in a housing to interrupt the flow of fluid. The valve member is formed to be unseated from the separating wall member in its free state so that the fluid may flow through a clearance between the valve member and the separating wall member when the pressure difference between one side of the separating wall member and the other is small, while it is formed to be seated on the separating wall member when the pressure difference has become larger. Therefore, the fluid can pass in the both directions crossing the separating wall member when the pressure difference is small, while it is interrupted when the pressure difference has increased.
Claims12
A fluid flow control apparatus comprising:
- a housing having a first and a second ports;
- first and second separating means disposed in said housing for forming therein a first, second and a third compartments, said first compartment being communicated with said first port, said third compartment being communicated with said second port and said second compartment being disposed between said first and third compartments;
- a first opening formed in said first separating means for communicating said first compartment with said second compartment;
- a second opening formed in said second separating means for communicating said second compartment with said third compartment;
- first valve means, cooperating with said first opening, for permitting fluid flow in one direction only from said first port to said second port through said first opening when a pressure difference in one direction and between said first and second ports exceeds a first predetermined value, whereby the fluid flow in the direction is established from said first port to said second port through said first and second openings;
- second valve means, cooperating with said second opening, for interrupting said fluid flow through said second opening when said pressure difference exceeds a second predetermined value higher than said first predetermined value.
A fluid flow control apparatus comprising:
- a housing having a first and a second ports;
- separating means disposed in said housing for forming therein a first and a second compartments, said first compartment being communicated with said first port and said second compartment being communicated with said second port;
- a first opening formed in said separating means for communicating said first compartment wth said second compartment;
- first valve means, cooperating with said first opening, for permitting fluid flow in one direction only from said first port to said second port through said first opening;
- and
- second valve means cooperating with said first opening, for interrupting said fluid flow through said first opening when a pressure difference in one direction and between said first and second ports exceeds a predetermined value;
- a second opening formed in said separating means for communicating said first compartment with said second compartment;
- and
- third valve means, cooperating with said second opening, for permitting opposite fluid flow, opposite to said fluid flow, from said second port to said first port through said second opening when an opposite pressure difference in an opposite direction and between said first and second ports exceeds a preset level.
Dependencies are inferred from the claim text.