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
F16K39/00—Devices for relieving the pressure on the sealing faces
F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
F16K39/022—Devices for relieving the pressure on the sealing faces for lift valves using balancing surfaces
Dispositif pour produire un melange reactionnel de composants fluides formateurs de mousse ou de matiere plastique homogene, notamment d'une isocyanate et d'un polyol