US PATENT SUBCLASS 137 / 859
.~.~.~.~ Peripherally secured diaphragm

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
843  DF  .~.~ Resilient material valve {4}
852  DF  .~.~.~ With valve member flexing about securement {4}
859.~.~.~.~ Peripherally secured diaphragm

DEFINITION

Classification: 137/859

(under subclass 852) Valve wherein said valve member is in the form of a resilient disc which is secured around its entire periphery.