Gate Valve Copper Bonnet seal. Manual operated Gate Valves with copper sealed bonnet are available with CF flanges only in port sizes from 5/8 to 12 inches. A copper seal bonnet valve can be baked to 250°C with the gate in the open position. This version is available with optional high temperature Kalrez gate O-ring. Silicone heater jackets for bakeouts up to 200°C can be provided.
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