UREA TANK FOR SCR AFTERTREATMENT SYSTEM, AND TANK COVER THEREOF

A urea tank for an SCR aftertreatment system, and a tank cover thereof. The tank cover is mounted at a liquid injection port of a tank body of the urea tank. An air hole is provided in a portion of the tank cover corresponding to the liquid injection port. The air hole is covered by a water-blocking air-permeable film (5). A gas inlet hole and a gas discharge hole (11) are further provided in the portion of the tank cover corresponding to the liquid injection port. A first constant pressure check valve (3) and a second constant pressure check valve (4) are mounted on the tank cover. An inlet of the first constant pressure check valve (3) is connected to the gas discharge hole (11). An outlet of the first constant pressure check valve (3) communicates with the exterior of the tank body. An inlet of the second constant pressure check valve (4) is connected to the gas inlet hole. An outlet of the second constant pressure check valve (4) communicates with the interior of the tank body.