.~.~.~ With reverse flow stop or pressure regulating valve
DEFINITION
Classification: 137/198
(under subclass 197) Separating traps further provided with a pressure responsive valve in the gas outlet which prevents reverse flow or regulates the system gas pressure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
455+, for line condition change responsive valves, especially subclass 496 for those having separate reactor surface and closing in response to reverse flow, subclass 505 for the pressure regulating type, and subclasses 511+ for check valves, especially subclasses 517+ for those biased open.