Check valve
AssigneeDenso Corporation
InventorYasutaka Utsumi
Life of this patent
Estimating the term…
Abstract
In the check valve having a valve seat member and the valve member, the valve seat member is provided with first and second conical seats. The second conical seat is positioned upstream the first conical seat. An angle of the second conical seat to an axis of the valve member is more acute than that of the first conical seat. Since the check valve has the second conical seat, contact pressure applied to the first conical seat is uniformly dispersed and, thus, the first conical seat is less worn out. Further, the second conical seat prevents the valve member from cutting into and sticking to the valve seat member, even if the wear has been progressed. Accordingly, an operation of the check valve is stable for a longer period of time.
Claims10
A check valve for permitting fluid to flow in one direction in a fluid passage comprising:
- a valve seat member having an inner wall that forms the fluid passage, the inner wall being provided with immediately adjacent first and second conical seats and the second conical seat being positioned upstream the first conical seat;
- and
- a valve member being provided at an outer circumference thereof with a conical face that comes in contact with the first conical seat for closing the fluid passage and away therefrom for opening the fluid passage,
- wherein an angle of the second conical seat to an axis of the valve member is more acute than that of the first conical seat.
A check valve for permitting fluid to flow in one direction in a fluid passage comprising:
- a valve seat member having an inner wall that forms the fluid passage, the inner wall being provided with a conical seat;
- and
- a valve member being provided at an outer circumference thereof with immediately adjacent first and second conical faces, the second conical face being positioned downstream the first conical face and the first conical face coming in contact with the conical seat for closing the fluid passage and away therefrom for opening the fluid passage,
- wherein an angle of the second conical face to an axis of the valve member is more acute than that of the first conical face.
Dependencies are inferred from the claim text.