Pressure adjustable radiator cap

A pressure adjustable radiator cap comprising:

• a body, a center of which is screwed with a pressure adjustment assembly, and a lower end of the pressure adjustment assembly being connected with a covering assembly;
• wherein the pressure adjustment assembly includes a rotatable knob, an adjusting bolt, a push spring, and a holder;
• the covering assembly includes a rubber gasket, a lid, a positioning spring, and a coupling sleeve;
• wherein the pressure adjustment assembly abuts against the push spring by using of a connection disc on a lower end of the adjusting bolt, and the riveting portion on the lower end of the adjusting bolt contacts with the coupling sleeve so that the pressure adjustment assembly is connected with the covering assembly, wherein the rotatable knob is rotated to actuate the adjusting bolt to revolve so as to change a screwing force between the adjusting bolt and the body, such that the connection disc of the adjusting bolt abuts against the push spring by using different forces, and the push spring pushes the holder, the lid, and the rubber gasket in difference pushing forces so as to adjust a closing pressure of the covering assembly to water inlet of a water tank.