The Model G20 globe style control valve can be used for either throttling or on/off control of gases or liquids. The Model G20 is used for a wide range of pressure drops and temperatures. The G20 is a balanced plug used where Class II and III shutoff is adequate. The G21 is a balanced plug design plug used where Class IV and V shutoff is required. The G22 uses an unbalanced plug that is top or top and port guided that provides Class IV, V and VI shutoff. The G23 uses an unbalanced cage guided plug that provides Class IV, V and VI shutoff.