The dialysis machine is connected to the valve, the normal state of the valve is closed, the handle is lifted up, the valve is opened, the fluid can flow out of the sampling port instantly, the operation is simple and reliable. The valve body is made of 304/316L stainless steel. The inside of the valve body is made of silicone sealing ring and its spring, which can isolate the pollution of the valve core to the water quality. Simple structure, good sealing, acid and alkali resistance, low fluid resistance. Can be used for low pressure, low temperature, corrosive and containing suspended materials of the sampling medium.