A pipe connector assembly, comprising: a body having an internal channel for a fluid medium; a leak-proof valve; and a connection head located on the body for connecting the pipe connector assembly to a tire valve, wherein the leak-proof valve comprises: a valve seat hermetically coupled to the body and having a sealing ring juxtaposed on an outer surface of an outlet end of the valve seat; a valve core having a thimble extending through the valve seat for abutting a tire valve core and opening an gas path sealing of the tire valve when the pipe connector assembly is connected to the tire valve; and a reset element that biases the valve core toward the valve seat within the internal channel to close the leak-proof valve when the valve core is in intimate contact with the valve seat, wherein the tire valve abuts against the sealing ring when the connection head tightly connects the pipe connector assembly with the tire valve such that the sealing ring provides a sealed fluid medium path between the valve seat and the tire valve; and wherein the tire valve core is capable of pushing the thimble to open the leak-proof valve only after the sealed fluid medium path is formed between the valve seat and the tire valve. a body having an internal channel for a fluid medium; a leak-proof valve; and a connection head located on the body for connecting the pipe connector assembly to a tire valve, wherein the leak-proof valve comprises: a valve seat hermetically coupled to the body and having a sealing ring juxtaposed on an outer surface of an outlet end of the valve seat; a valve core having a thimble extending through the valve seat for abutting a tire valve core and opening an gas path sealing of the tire valve when the pipe connector assembly is connected to the tire valve; and a reset element that biases the valve core toward the valve seat within the internal channel to close the leak-proof valve when the valve core is in intimate contact with the valve seat, wherein the tire valve abuts against the sealing ring when the connection head tightly connects the pipe connector assembly with the tire valve such that the sealing ring provides a sealed fluid medium path between the valve seat and the tire valve; and wherein the tire valve core is capable of pushing the thimble to open the leak-proof valve only after the sealed fluid medium path is formed between the valve seat and the tire valve. a valve seat hermetically coupled to the body and having a sealing ring juxtaposed on an outer surface of an outlet end of the valve seat; a valve core having a thimble extending through the valve seat for abutting a tire valve core and opening an gas path sealing of the tire valve when the pipe connector assembly is connected to the tire valve; and a reset element that biases the valve core toward the valve seat within the internal channel to close the leak-proof valve when the valve core is in intimate contact with the valve seat, wherein the tire valve abuts against the sealing ring when the connection head tightly connects the pipe connector assembly with the tire valve such that the sealing ring provides a sealed fluid medium path between the valve seat and the tire valve; and wherein the tire valve core is capable of pushing the thimble to open the leak-proof valve only after the sealed fluid medium path is formed between the valve seat and the tire valve.