in which the closing movement, either retarded or not, starts immediately after opening

Introduced: September 1968

Last revised: January 2006

Full Title

Fluid-delivery valves > Self-closing valves, i.e. closing automatically after operation > in which the closing movement, either retarded or not, starts immediately after opening

Classification Context

Section:: MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
Class:: ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
Subclass:: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING

3 direct subcodes

Child Classifications

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F16K 21/08 with ball-shaped closing members
F16K 21/1 with hydraulic brake cylinder acting on the closure member
F16K 21/12 with hydraulically-operated opening means; with arrangements for pressure relief before opening