Check valve
AssigneePiolax, Inc.
InventorKosei YAMAGUCHI
Life of this patent
Estimating the term…
Abstract
An embodiment provides a check valve including a valve case, a positive pressure valve having a resin ring sealing member, and a resin negative pressure valve. The positive pressure valve and the negative pressure valve are disposed in the valve case. The positive pressure valve includes a first mount surface and a second mount surface disposed on an inner diameter side of the first mount surface. In the valve case, a presser cap is mounted on the positive pressure valve so as to sandwich the ring sealing member and the negative pressure valve with the first mount surface and the second mount surface of the positive pressure valve.
Claims5
A check valve including:
- a valve case including
- a first connection portion connectable with a pipe communicating with a fuel tank,
- a second connection portion connectable with a pipe communicating with a canister disposed outside of the fuel tank,
- a valve chamber defined in an interior of the valve case, and
- a positive pressure valve seat formed at a portion within a range from the valve chamber to the first connection portion;
- a positive pressure valve slidably disposed in the valve chamber so as to close or open the positive pressure valve seat, the positive pressure valve including
- a penetrating passage penetrating inside the positive pressure valve, and
- a negative pressure valve seat disposed around an opening portion of the penetrating passage at a side of the first connection portion;
- a spring disposed in the valve case, and arranged to urge the positive pressure valve so as to be brought into contact with the positive pressure valve seat, and to be compressed so as to open the positive pressure valve from the positive pressure valve seat when a pressure at the side of the first connection portion rises to a positive-pressure threshold or higher;
- and
- a negative pressure valve made from an elastic resin material, assembled to the positive pressure valve, and arranged to be brought into elastic contact with the negative pressure valve seat so as to close the penetrating passage in a normal state, and to open the penetrating passage when the pressure at the side of the first connection portion drops to a negative-pressure threshold or lower,
- wherein the positive pressure valve includes
- a valve main body, and
- a ring sealing member assembled to the valve main body, made from an elastic resin material, and arranged to close or open the positive pressure valve seat,
- wherein the valve main body includes
- a first mount surface on which the ring sealing member is mounted, and
- a second mount surface which is disposed on an inner diameter side of the first mount surface, on which the negative pressure valve seat is formed, and on which the negative pressure valve is mounted, and
- wherein a presser cap is further mounted on the positive pressure valve, so that the presser cap sandwiches the ring sealing member with the first mount surface of the valve main body and sandwiches the negative pressure valve with the second mount surface of the valve main body.
Dependencies are inferred from the claim text.