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Vernay Duckbill Check Valves, widely used in the demanding applications of many industries, are precision-molded, one-piece elastomeric valves that provide reliable backflow prevention at low pressure differentials. Duckbill check valves allow free flow with positive differential pressure. With negative differential pressure, backflow is checked.

Vernay Umbrella Check Valves are designed to open and close at a range of predetermined pressures and can be developed for high or low opening pressures. Pressure drop across the valve is controlled by the modulus of material, effective flow area, the amount of pre-load on the sealing edge and the thickness of the umbrella skirt section.