(under subclass 504) Subject matter relating to boilers with valves that close automatically when some part of the boiler bursts in order to prevent steam or water from escaping.
SEE OR SEARCH THIS CLASS, SUBCLASS:
364, for hand operated valves for closing tubes and headers.
SEE OR SEARCH CLASS
96, Gas Separation: Apparatus,
408+, for gas separation apparatus having automatic control means for regulation of separated constituent discharge.
