Incorrect check valve selection can aggravate surge and water-hammer in pipeline systems, resulting in what is known as “Check Valve Slam” causing transients which could exceed the pipeline’s working pressure by up to five times. Check valves can also be one of the biggest contributions to head loss within a pipeline, which in turn increases power consumption. Vento-O-Mat’s range of nozzle check valves addresses both these concerns by providing a *non-slam valve with a very low pressure loss.

The valve utlises a ring-shaped disc as the closing member. Rapid *slam-free closure is achieved utilising friction free helical springs and radial guides. Annular ring type nozzle check valves outperform center shaft nozzle designs (mushroom type) in respect of dynamic and head loss performance because of the low mass of the moving parts (ring shaped disc) and the superior pressure recovery capabilities inherent in the two-port annulus configuration.