It is made of polytetrafluoroethylene (PTFE). The patented design utilizes moulding, self-sealing mechanism, no O-ring is inside therefore cross-contamination is eliminated. The connector of PTFE valve is vertical to the bag film,external diameter is 6mm. When the handle is endways, the valve is open, when the handle is sideways, the valve is closed. PTFE switch is easy to handle and swift and sealing tightly,the connecter can be instaled sample cap,which fits sillcone pad used for needle sampling and vacuumizing. It suitable for filling of inorganic and organic gases which are not corrosive to PTFE. The sample cap has a silicone septum that can be used to needle sampling,for the gas in the bag can’t touch the silicone pad in sample cap,can’t be polluted,so the PTFE valve can be used in analysis high accuracy low concentration gas samples collection and preservation.Gas sampling bag with PTFE valve has won the national patent.
