Urea solution venting system for vehicle

A urea solution venting system for a vehicle which passes an ammonia component produced from a urea solution supplied for post-processing on an exhaust gas of the vehicle, the system comprising:

• a urea solution tank that stores a urea solution;
• a urea solution injection pipe that communicates with the urea solution tank to replenish the urea solution tank with the urea solution;
• a first venting pipe of which a first end communicates with the urea solution injection pipe and a second end is connected to the urea solution tank in order to send an ammonia component produced in the urea solution tank to the urea solution injection pipe;
• a valve module that is disposed between the first venting pipe and the urea solution injection pipe and includes:
• a first outlet for sending an ammonia component in the first venting pipe to the urea solution injection pipe;
• and
• a second outlet through which an ammonia component in the urea solution injection pipe is discharged to the outside;
• a urea solution injection port that is formed at a first end of the urea solution injection pipe to receive an injection gun for injecting the urea solution into the urea solution injection pipe;
• and
• a flap that is pivotally mounted to the urea solution injection port and selectively closes the urea solution injection port, wherein as the injection gun is inserted into the urea solution injection port, the flap opens the urea solution injection port and closes the first and the second outlets of the valve module by being pushed by the injection gun.