| 摘要 |
A gas sampling bag valve with sealing rings moving back and forth to control a lateral gas nozzle is easy to operate and not prone to leaking gas. The connection portion of the valve and a gas sampling bag film is sequentially provided with a valve body with the lateral gas nozzle, a rubber gasket, the gas sampling bag film and a bottom disc of a fastener from the outside to the inside, and the valve is fixed to a gas sampling bag by clockwise rotating the fastener. The sealing ring of a top cover control switch close to a knob prevents gas from leaking from a thread gap between the top cover control switch and the valve body. When the top cover control switch is clockwise or anticlockwise rotated, the other sealing ring moves back and forth in a valve body lateral hole to open and close the valve. In the closed state of the valve, the sealing ring on the top cover control switch far away from the knob is disposed on the side of the lateral gas nozzle of the valve body far away from the knob; and in the open state of the valve, the two sealing rings on the top cover control switch are both located on the side in the center of the valve body lateral hole towards the knob. |
