Plug Valves with PTFE Sleeve

Durco G4 Gaskets provide a better seal in the passageway than other comparable on / off valves and provide equivalent or superior emissions protection compared to custom-made high-duty specialty valves. They are ideal for difficult chemical and process applications, for shutting off piping, pumps, liquid containers, reactors, and other critical applications. G4Z series stopcocks are fireproof unlike the standard G4 and G4E models. The tap G4Z-HF is intended for example for alkylation plants with UOP / Phillips license in refineries. G4Z and G4EZ and G4EBZ refractory valves are provided with special Grafoil ring packing on the spindle and Grafoil gaskets on the upper fitting cover, limiting any air infiltration to an insignificant extent in the event of destruction of the PTFE bush and diaphragm by fire. If the upper seal is destroyed, the Grafoil pack is held in place by a metal diaphragm.