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A two-way valve includes a valve case with the first valve seat formed at one of two openings, the first valve member movable in the valve case for abutting against the first valve seat, and the first urging device for urging the first valve member toward the first valve seat. The first valve member

A two-way valve includes a valve case with the first valve seat formed at one of two openings, the first valve member movable in the valve case for abutting against the first valve seat, and the first urging device for urging the first valve member toward the first valve seat. The first valve member includes a communication path therein and the second valve seat formed at one end portion thereof. The second valve member for abutting against the second valve seat is disposed in the communication path to block the communication path, and the second urging device is provided for urging the second valve member toward the second valve seat.

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1. A two-way valve, comprising:a valve case having two openings and a first valve seat formed at one of the two openings; a first valve member movably disposed in the valve case for closing the one of the two openings upon abutting against the first valve seat, said first valve member having a first

1. A two-way valve, comprising:a valve case having two openings and a first valve seat formed at one of the two openings; a first valve member movably disposed in the valve case for closing the one of the two openings upon abutting against the first valve seat, said first valve member having a first head portion forming a protrusion, a communication path with two ends and a second valve seat formed at the first head portion in one of the two ends of the communication path; a first urging device disposed in the valve case for urging the first valve member toward the first valve seat; a second valve member disposed in the valve case and having a second head portion located outside the first valve member for closing the communication path upon abutting against the second valve seat from outside the first valve member, said second head portion having a circular cone shape to form an inclined surface from the second head portion to the first head portion when the second valve member is disposed on the second valve seat so that when the first valve moves away from the first valve seat against a force of the first urging device, a fluid is guided smoothly to an inner surface of the valve case along the second valve head and the first valve head; and a second urging device disposed in the valve case for urging the second valve member toward the second valve seat at the communication path, said second urging device being disposed between the second valve member and an inner surface of the valve case. 2. A two-way valve, comprising:a valve case having two openings and a first valve seat formed at one of the two openings, said valve case being formed of a case main body with a bottom and a lid for closing the case main body, said bottom of the case main body having the one of the two openings of the valve case and said lid having the other of the two openings of the valve case; a first valve member movably disposed in the valve case for closing the one of the two openings upon abutting against the first valve seat, said first valve member having a first head portion forming a protrusion, a communication path with two ends and a second valve seat formed at the first head portion in one of the two ends of the communication path; a first urging device disposed in the valve case for urging the first valve member toward the first valve seat; a second valve member disposed in the valve case and having a second head portion located outside the first valve member for closing the communication path upon abutting against the second valve seat from outside the first valve member, said second head portion having a circular cone shape to form an inclined surface from the second head portion to the first head portion when the second valve member is disposed on the second valve seat so that when the first valve moves away from the first valve seat against a force of the first urging device, a fluid is guided smoothly to an inner surface of the valve case along the second valve head and the first valve head; and a second urging device disposed in the valve case for urging the second valve member toward the second valve seat at the communication path. 3. A two-way valve according to claim 2, wherein said second valve member includes a shaft portion attached to the second head portion and slidably located in the communication path, said second head portion being arranged to abut against the second valve seat from an outside of the first valve member to close the communication path.4. A two-way valve according to claim 3, wherein said shaft portion has an outer dimension smaller than an inner dimension of the communication path so that when the second valve moves away from the second valve seat against a force of the second urging device, fluid passes through a space between an outer surface of the shaft portion and an inner surface of the communication path.5. A two-way valve according to claim 2, wherein said one of the two openings of the valve case is connected to a fuel tank in an automobile, and said other of the two openings of the valve case is connected to a canister in the automobile so that the two-way valve can regulate a difference in pressure between the fuel tank and the canister.6. A two-way valve according to claim 2, wherein said first valve member has an outer dimension smaller than an inner dimension of the valve case so that when the first valve moves away from the first valve seat against a force of the first urging device, fluid passes through a space between an outer surface of the first valve member and an inner surface of the valve case.7. A two-way valve according to claim 2, wherein said valve case further includes a pipe extending from the bottom around the one of the two openings of the valve case, said first valve seat being formed at the bottom around the one of the two openings.8. A two-way valve according to claim 7, wherein said pipe includes a step portion at an inner periphery thereof, one end of the second urging device being disposed on the step portion.9. A two-way valve, comprising:a valve case having two openings and a first valve seat formed at one of the two openings; a first valve member movably disposed in the valve case for closing the one of the two openings upon abutting against the first valve seat, said first valve member having a communication path with two ends therein and a second valve seat formed at one of the two ends of the communication path, and formed of an outer cylindrical portion, an inner cylindrical portion disposed in the outer cylindrical portion, and a protrusion integrally connected to one end of the outer cylindrical portion and one end of the inner cylindrical portion, said protrusion having the second valve seat and a valve seat abutting against the first valve seat; a first urging device disposed in the valve case for urging the first valve member toward the first valve seat; a second valve member disposed in the valve case and having a head portion located outside the first valve member for closing the communication path upon abutting against the second valve seat from outside the first valve member; and a second urging -device disposed in the valve case for urging the second valve member toward the second valve seat at the communication path. 10. A two-way valve according to claim 9, wherein said first urging device is disposed between the valve case and a space between the inner and outer cylindrical portions.