Expansion tank with a liquid check valve body and a relative to this movably received on this gas vacuum valve body and such a valve structure supporting lid for a surge tank

摘要

Expansion tank of a motor vehicle cooling circuit, which is operatively designed at least for receiving liquid and gas, with a leading into the surge tank liquid supply (14) and with a separate from the liquid supply line (14) formed, leading out of the liquid container liquid discharge, said Reservoir has a check valve with a check valve body (42) which is adjustable between a blocking position in which it interrupts a liquid flow, and a passage position in which it passes a liquid flow, wherein the check valve body (42) is provided such that it depends on the pressure of a fluid received in the surge tank is adjusted to its blocking position to interrupt a liquid flow from the liquid supply line (14) for liquid discharge, wherein the check valve with the check valve body (42) vorg such It can be seen that the check valve body (42) is in its blocking position only when the differential pressure of the gas in the surge tank relative to the ambient pressure does not exceed a predetermined first threshold value and when the differential pressure of the gas exceeds the predetermined first threshold value , a liquid flow from the liquid supply line (14) for liquid discharge, characterized in that the surge tank comprises a vacuum valve with a vacuum valve body (54), which, when the differential pressure of the gas in the surge tank relative to the ambient pressure below a predetermined vacuum valve threshold, a allows the differential pressure increasing gas flow into the surge tank, and which, when the differential pressure of the gas does not fall below the predetermined vacuum valve threshold, is in its closed position, in w elcher he closes one of the outer environment of the expansion tank in the interior (16) leading equalization channel (60) and thus prevents a differential pressure increasing gas flow into the surge tank inside, wherein the vacuum valve body (54) is received on the check valve body (42) movable relative to this.