with hydraulically-operated opening means; with arrangements for pressure relief before opening

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 > with hydraulically-operated opening means; with arrangements for pressure relief before 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