Patent ID: 8001702

Claim:
A double diaphragm check valve for a wetsuit boot having a wall with an inside surface on an inside and an outside surface exposed to the environment, comprising: a first body disposed on said inside surface being partially inserted through said wall and having an inlet valve seat; a first elastomeric diaphragm seated within said first valve seat body and supported by said inlet valve seat forming an inlet valve; a second body having an outlet valve seat being disposed on said outside surface and configured to hermitically connect in series to said first body sandwiching said wall therebetween; a second elastomeric diaphragm seated within said second body and supported by said outlet valve seat forming an outlet valve, a chamber formed in said second body between said inlet valve seat configured to provide clearance for said first elastomeric diaphragm; said double diaphragm check valve substantially restricting fluid flow to a direction from said inside to the environment, a fluid under pressure cracking said inlet valve permitting said fluid to enter said chamber and thereafter cracking said outlet valve to permit fluid flow to the environment and substantially preventing backflow.