Pressure relief valve device

A pressure relief valve device comprising:

• a valve housing that surrounds an axis, that defines a chamber therein, and that has at least one exhaust opening in fluid communication with said chamber;
• a sleeve that is connected to one end of said valve housing, and that has
• a peripheral wall surrounding the axis and defining a pressure relief hole therein, and
• a plurality of inlet holes formed through said peripheral wall and in fluid communication with said pressure relief hole;
• a pushed unit that includes
• a pushed rod disposed movably in said sleeve, adapted to be pushed to move along the axis relative to said sleeve by a fluid flowing in said pressure relief hole, and blocking the fluid communication among said inlet holes and said pressure relief hole when being pushed by the fluid,
• a flow guiding passage extending through said pushed rod along the axis and in fluid communication with said pressure relief hole, and
• a valve cover disposed in said chamber;
• and
• a biasing member that is disposed in said chamber and that biases said valve cover toward said pushed rod;
• wherein said valve cover is movable relative to said pushed rod between a closed position, where said biasing member biases said valve cover to abut against said pushed rod such that said chamber is not in fluid communication with said flow guiding passage, and a pressure relief position, where said valve cover is moved away from said pushed rod such that said flow guiding passage is in fluid communication with said chamber.