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F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
F16L55/02—Energy absorbers; Noise absorbers
F16L55/027—Throttle passages
F16L55/02772—Throttle passages using spirally or helically shaped channels
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FR427750D1911-03-251911-03-25Dispositif pour affaiblir les bruits dans les conduites d'eau
ExpiredFR427750A
(fr)
Perfectionnements apportés aux appareils pour indiquer automatiquement les voies d'eau dans les navires, et aux moyens pour enlever l'eau entrée dans ces derniers