Gas-insulated high-voltage power circuit breaker

A gas-insulated high-voltage power circuit breaker, comprising

• a compression device, operated by a drive of the circuit breaker, with a compression volume which is filled with insulating gas and in which the insulating gas is compressed, forming quenching gas, when the circuit breaker opens,
• a low-pressure volume which is filled with insulating gas, and
• a valve which interconnects the compression volume and the low-pressure volume, through which valve insulating gas flows from the low-pressure volume into the compression volume when the circuit breaker closes and through which insulating gas flows from the compression volume in the reverse direction into the low-pressure volume when the circuit breaker opens above a threshold value of the quenching gas pressure,
• in which the valve has the following elements:
• a valve body, which is guided through the wall of the compression chamber, with a gas passage which connects the compression volume and the low-pressure volume and a valve seat which encompasses the gas passage,
• a valve plate which is operated by the insulating gas, is movably mounted in the valve body, and sits on the valve seat when the circuit breaker opens, and also
• a stop which is integrated into the valve body and limits the movement of the valve plate when the circuit breaker closes,
• characterized in that the valve plate has at least one hole and at least one leaf spring which is fastened on one side, is elastically bendable in dependence upon the pressure of the insulating gas in the compression volume, closes off the hole when the circuit breaker closes, opens the hole when the circuit breaker opens, and limits a flow passage, which is guided through the hole, for the insulating gas which discharges from the compression volume as soon as the pressure of the compressed insulating gas in the compression volume exceeds the value of the gas pressure in the low-pressure chamber by at least two bar.