F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
F16K41/00—Spindle sealings
F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
F16K41/023—Spindle sealings with stuffing-box ; Sealing rings for spindles which only rotate, i.e. non-rising spindles
F16K41/026—Spindle sealings with stuffing-box ; Sealing rings for spindles which only rotate, i.e. non-rising spindles for rotating valves