Gas cylinders. Self-closing cylinder valves. Specification and type testing1 Scope This document specifies the design, type testing, marking and manufacturing tests and examinations requirements for self closing cylinder valves intended to be fitted to refillable transportable gas cylinders which convey compressed, liquefied or dissolved gases. NOTE 1 The main applications for such self closing cylinder valves are in the calibration gas and beverage industries. This document covers the function of a self closing cylinder

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