Check or one-way valves allow liquid flow in one direction and resist reflux, or back-flow, in the opposite direction based upon the presence of an internal elastomeric “duckbill” valve or an elastomeric disc. This elastomeric valve is often housed in an injection-molded polymer/plastic body which is either ultrasonically welded or adhesively bonded.
Check valves are manufactured in high volume on highspeed automated production lines and testing 100% of parts for the different potential failures is critical.
The common method to leak test these valves is the use of dry compressed air pressure or vacuum decay at pressures ranging from -12 to 50 psig. The single channel Sentinel Blackbelt or multi-channel Blackbelt Pro pressure/vacuum decay instrumentation with multiple sequential ports per test channel enable this type of testing.
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