US PATENT SUBCLASS 122 / 507
.~ Self-closing valve


Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

504  DF  SAFETY DEVICES {4}
507.~ Self-closing valve


DEFINITION

Classification: 122/507

(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.

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364, for hand operated valves for closing tubes and headers.

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96, Gas Separation: Apparatus,

408+, for gas separation apparatus having automatic control means for regulation of separated constituent discharge.