US PATENT SUBCLASS 137 / 469
.~ Pop valves

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
469.~ Pop valves {5}
470  DF  .~.~> Pop closing valves
471  DF  .~.~> Pop pressure reactor in inflow to valve
472  DF  .~.~> Pop pressure reactor in branched released path {1}
474  DF  .~.~> Lost motion between pop pressure reactor and valve
475  DF  .~.~> Adjustable choke {1}

DEFINITION

Classification: 137/469

(under subclass 455) Valves which are biased closed and are forced open by fluid pressure, the fluid flowing through the valve after the initial opening movement thereof acting on an auxiliary reactor surface to affect the valve opening and/or closing motion.

(1) Note. The auxiliary reactor surface may be either (a) a surface configuration of the valve sensitive to fluid flow, (b) a distinct surface affected by fluid which has passed through the valve or (c) a distinct surface located upstream of the relieved fluid flow and affected by the pressure condition created by the flow.

(2) Note. Pop relief valves are classified in this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+, for condition responsive valves in which the initial opening movement of the valve is caused or assisted by pressure on a separate but connected reactor surface.

511+, for condition responsive valves of the check valve type, i.e., directly responsive.