Tank sealing valve and evaporation fuel processing device including the same

A tank sealing valve arranged in a passage network through which a fluid flows between a fuel tank and a canister, comprising:

• a first valve unit and a second valve unit that are energized and controlled by a control portion to open and close, the first valve unit opening to control the fluid to flow with a relatively large flow amount, the first valve unit closing and the second valve unit opening to control the fluid to flow with a relatively small flow amount that is smaller than the relatively large flow amount,
• the first valve unit including
• an outer case body that includes at least three ports which include inlets and outlets of the fluid,
• a valve body that is movably received in the outer case body and includes a valve portion opening and closing a first port of the three ports and a column portion extending from the valve portion,
• a spring that biases the valve body in a direction closing the first port,
• an electromagnetic solenoid cancelling a biasing force of the spring and driving the valve body in a direction opening the first port, and
• a diaphragm or a bellows that is arranged between the column portion and the outer base body and divides an interior of the outer case body into at least two chambers, wherein
• the valve portion is received in a first chamber of the two chambers and the column portion protrudes into a second chamber of the two chambers, the first port and a second port of the three ports are open toward the first chamber and a third port of the three ports is open toward the second chamber,
• the valve body includes a through passage penetrating the valve portion and the column portion,
• the valve portion communicates with the first port and the second chamber through the through passage in a case where the first port is closed, and
• the second valve unit opens and closes the third port.