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US 9,097,356 B2Granted
Check valve
AssigneePiolax, Inc.
InventorKosei Yamaguchi
Life of this patent
Estimating the term…
Abstract
A check valve includes a casing including a positive pressure valve seat, a positive pressure valve urged by a positive pressure valve spring and including a negative pressure valve seat, and a negative pressure valve assembled to the positive pressure valve and urged by a negative pressure valve spring, where the positive pressure valve includes an inner cylinder, an outer cylinder that is connected with an outer circumference of the inner cylinder via ribs, and passages formed between the inner cylinder and the outer cylinder, where the positive pressure valve spring is disposed the casing and the outer cylinder, and where the negative pressure valve spring is disposed in the inner cylinder.
Claims12
A check valve capable of being mounted on a fuel tank, the check valve comprising:
- a casing including:
- a valve chamber formed in an interior of the casing;
- a first end communicating with the valve chamber, the first end to be connected to an interior of the fuel tank to thereby communicate between the valve chamber and the interior of the fuel tank;
- a second end communicating with the valve chamber, the second end to be connected to an exterior of the fuel tank to thereby communicate between the valve chamber and the exterior of the fuel tank;
- and
- a positive pressure valve seat formed in the valve chamber at a side of the first end;
- a positive pressure valve slidably disposed in the valve chamber, the positive pressure valve including:
- an inner cylinder through which a penetrating passage penetrates an opening portion being formed on the inner cylinder at a side of the first end of the casing so as to be communicated with the penetrating passage;
- a negative pressure valve seat formed on a circumference of the opening portion;
- a contact surface formed on an outer circumference of the negative pressure valve seat and brought into contact with or separated from the positive pressure valve seat;
- a rib extending from an outer circumference of the inner cylinder;
- and
- an outer cylinder disposed outwardly of the inner cylinder and connected with the outer circumference of the inner cylinder via the rib so as to define a passage formed between the inner cylinder and the outer cylinder;
- a positive pressure valve spring disposed in the casing to urge the positive pressure valve so as to be brought into contact with the positive pressure valve seat;
- a negative pressure valve assembled to the positive pressure valve so as to open and close the negative pressure valve seat of the positive pressure valve;
- and
- a negative pressure valve spring disposed in the positive pressure valve to urge the negative pressure valve so as to be brought into contact with the negative pressure valve seat,
- wherein the positive pressure valve spring is disposed between an inner circumference of the casing and an outer circumference of the outer cylinder, such that one end of the positive pressure valve spring is supported by the casing while the other end of the positive pressure valve spring is supported by the outer cylinder,
- wherein the negative pressure valve spring is disposed in the inner cylinder, and
- wherein the negative pressure valve seat is defined on an outer surface of the inner cylinder of the positive pressure valve.
17 more elements
A check valve capable of being mounted on a fuel tank, the check valve comprising:
- a casing including:
- a valve chamber formed in an interior of the casing;
- a first end communicating with the valve chamber, the first end to be connected to an interior of the fuel tank to thereby communicate between the valve chamber and the interior of the fuel tank;
- a second end communicating with the valve chamber, the second end to be connected to an exterior of the fuel tank to thereby communicate between the valve chamber and the exterior of the fuel tank;
- and
- a positive pressure valve seat formed in the valve chamber at a side of the first end;
- a positive pressure valve slidably disposed in the valve chamber, the positive pressure valve including:
- an inner cylinder through which a penetrating passage penetrates an opening portion being formed on the inner cylinder at a side of the first end of the casing so as to be communicated with the penetrating passage;
- a negative pressure valve seat formed on a circumference of the opening portion;
- a contact surface formed on an outer circumference of the negative pressure valve seat and brought into contact with or separated from the positive pressure valve seat;
- a rib extending from an outer circumference of the inner cylinder;
- an outer cylinder disposed outwardly of the inner cylinder and connected with the outer circumference of the inner cylinder via the rib so as to define a passage formed between the inner cylinder and the outer cylinder;
- a positive pressure valve spring disposed in the casing to urge the positive pressure valve so as to be brought into contact with the positive pressure valve seat;
- a negative pressure valve assembled to the positive pressure valve so as to open and close the negative pressure valve seat of the positive pressure valve;
- and
- a negative pressure valve spring disposed in the positive pressure valve to urge the negative pressure valve so as to be brought into contact with the negative pressure valve seat,
- wherein the positive pressure valve spring is disposed between an inner circumference of the casing and an outer circumference of the outer cylinder, such that one end of the positive pressure valve spring is supported by the casing while the other end of the positive pressure valve spring is supported by the outer cylinder,
- wherein the negative pressure valve spring is disposed in the inner cylinder,
- wherein the negative pressure valve includes
- a negative pressure valve main body having
- a head portion brought into contact with or separated from the negative pressure valve seat of the inner cylinder,
- a shaft portion extending from the head portion and is inserted into the inner cylinder through the negative pressure valve seat, and
- an engaging projecting portion formed on the shaft portion;
- and
- a retaining member having
- a cylinder portion into which the shaft portion of the negative pressure valve main body is inserted,
- an engaging lug extending from the cylinder portion so as to be engaged with the engaging projecting portion, and
- a spring supporting portion formed on an outer circumference of the cylinder portion,
- wherein a passage is formed between the shaft portion and the cylinder portion, and
- wherein one end of the negative pressure valve spring is supported by the inner cylinder of the positive pressure valve while the other end thereof is supported by the spring supporting portion.
27 more elements
A check valve capable of being mounted on a fuel tank, the check valve comprising:
- a casing including:
- a valve chamber formed in an interior of the casing
- a first end communicating with the valve chamber, the first end to be connected to an interior of the fuel tank to thereby communicate between the valve chamber and the interior of the fuel tank;
- a second end communicating with the valve chamber, the second end to be connected to an exterior of the fuel tank to thereby communicate between the valve chamber and the exterior of the fuel tank;
- and
- a positive pressure valve seat formed in the valve chamber at a side of the first end;
- a positive pressure valve slidably disposed in the valve chamber, the positive pressure valve including:
- an inner cylinder through which a penetrating passage penetrates an opening portion being formed on the inner cylinder at a side of the first end of the casing so as to be communicated with the penetrating;
- a negative pressure valve seat formed on a circumference of the opening portion;
- a contact surface formed on an outer circumference of the negative pressure valve seat and brought into contact with or separated from the positive pressure valve seat;
- a rib extending from an outer circumference of the inner cylinder;
- an outer cylinder disposed outwardly of the inner cylinder and connected with the outer circumference of the inner cylinder via the rib so as to define a passage formed between the inner cylinder and the outer cylinder, and
- a positive pressure valve spring disposed in the casing to urge the positive pressure valve so as to be brought into contact with the positive pressure valve seat;
- a negative pressure valve assembled to the positive pressure valve so as to open and close the negative pressure valve seat of the positive pressure valve,
- a negative pressure valve spring disposed in the positive pressure valve to urge the negative pressure valve so as to be brought into contact with the negative pressure valve seat,
- wherein the positive pressure valve spring is disposed between an inner circumference of the casing and an outer circumference of the outer cylinder, such that one end of the positive pressure valve spring is supported by the casing while the other end of the positive pressure valve spring is supported by the outer cylinder,
- wherein the negative pressure valve spring is disposed in the inner cylinder, and
- wherein, when viewed in a direction perpendicular to an axis of the negative pressure valve, the inner cylinder and the outer cylinder overlap with each other.
15 more elements
Dependencies are inferred from the claim text.