US PATENT SUBCLASS 218 / 66
.~.~.~ Valve (e.g., blast valve or pressure relief valve)

Current as of: June, 1999
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218 /   HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES

1  DF  ARC PREVENTING OR EXTINGUISHING DEVICES {14}
43  DF  .~ Air-current blowout {18}
57  DF  .~.~ Puffer piston {6}
66.~.~.~ Valve (e.g., blast valve or pressure relief valve)

DEFINITION

Classification: 218/66

Valve (e.g., blast valve or pressure relief valve):

(under subclass 57) Subject matter wherein a movable cover or lid which regulates the ingress and egress of fluids and gases, such as a blast valve or pressure relief valve, are included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

109, for liquid circuit interrupter.