US PATENT SUBCLASS 137 / 505.12
.~.~.~ Multi-stage
Current as of:
June, 1999
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137 /
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FLUID HANDLING
455
DF
LINE CONDITION CHANGE RESPONSIVE VALVES
{11}
494
DF
.~ With separate connected fluid reactor surface {8}
505
DF
.~.~ With opening bias (e.g., pressure regulator) {13}
505.12
.~.~.~ Multi-stage
DEFINITION
Classification: 137/505.12
(under subclass 505) Devices in series with another line pressure responsive valve to produce plural stage reduction.
SEE OR SEARCH THIS CLASS, SUBCLASS:
512+, for plural serial direct response, reducing valves.