Controller 4 Evolution it's the stem packing for low emission application engineered for quarter turn-off valves. Equipped with the special multi-layers graphite wiper rings steel inserted, Controller 4 Evolution offers a great recovery combined with a very high aging resistance. Controller 4 Evolution can work easily with all industrial fluids in high pressure and temperature services, according to the EN 14772 - Section 6.7 weight loss requirements. Controller 4 Evolution is approved API std 622 3rd Edition.
Quarter turn-off valves