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 . <EOS>