I have a solenoid valve just like this and its rated 120 VAC/26VA (3 prongs, one for ground) . I also have a horizontal level switch for liquid like this http://germes-online.com/direct/dbimage/50279527/Level_Switch.jpg with rating 120 VAC/0.28 A (the switch will connect when the water level reach the target) normally open.

How can I wire them so that when the level reached the plug valve will close and water will not flow into the tank? The switch is inside the tank and the valve connecting the pipe for feed water.

I dont know what you are trying to accomplish. You didnt let us in on the brand and type, but it sounds like a front loader Duet or something like that. Are you trying to defeat the intention of the solenoid or what ? If so, forget it. Obviously you dont have a clue about this complicated washer.

From power, go to the float valve.
From the other side of the float valve, go to your solenoid.
From the other side of the solenoid, go to neutral return.

When the float valve is open, the switch will be open, and the solenoid will be open. When the float rises and closes the switch, the current will flow closing the NO solenoid to engage and shut off your water flow.

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