Pressure cap for cooling system of vehicle

A pressure cap apparatus for a cooling system of a vehicle, the apparatus comprising:

• a reservoir fill port which is mounted at an upper portion of a reservoir in which cooling water is stored or a radiator through which cooling water flows into a cooling system of the vehicle and is provided at a lateral side thereof with a communication port through which the cooling water or air flows;
• an external cap for closing an upper end portion of the reservoir fill port;
• a pressure valve disposed in the reservoir fill port to be configured for moving upwards and downwards and allow an inside and an outside of the reservoir fill port to fluidically-communicate with each other;
• a valve seal provided to contact with the pressure valve and allow the air to flow from the outside into the internal to the cooling system by being deformed when pressure in the internal to the cooling system is lower than a predetermined pressure;
• and
• a positive pressure spring elastically supporting the pressure valve such that the pressure valve closes the internal to the reservoir fill port,
• wherein the reservoir fill port further includes in the inside thereof a lower body supporting a bottom surface of the pressure valve and an upper body supporting an upper end portion of the positive pressure spring and wherein the valve seal includes a flexible material and is mounted between the pressure valve and the lower body,
• wherein the valve seal includes a valve seal body formed in a disk shape and disposed between the pressure valve and the lower body and wherein the valve seal body includes at least one communication hole for allowing upper and lower surfaces of the valve seal body to fluidically-communicate with each other, and
• wherein the communication hole is formed in plural numbers with a predetermined angular interval therebetween along a periphery of the valve seal.