The NozzleCheck is a non-slam axial check valve first developed in 1935. The first NozzleCheck valve installed in a nuclear power plant was in 1972; since then it has replaced over 800 conventional check valve designs.

Specifically designed to combat damaging transients and water hammering, the NozzleCheck valve has been improving systems in some of the most demanding nuclear plant applications.

With a number of designs, NozzleCheck offers check valves for large and small bore, dirty, high capacity, and severe service applications.

In 1992, Curtiss-Wright Nuclear started manufacturing NozzleCheck valves under its Appendix B Program. Since that time, Curtiss-Wright Nuclear has been exclusively offering ASME Section III Class 1, 2, and 3, Safety-Related and Commercial NozzleCheck valves to the nuclear industry.
The NozzleCheck DRV-Z is an axial flow, inline check valve. Similar to a conventional check valve, the DRV-Z allows forward flow under normal conditions, opens quickly with ease, firmly backseats at a low velocity and closes on a reverse flow with minimal seat leakage.

The DRV-Z provides a maintenance free design using minimal moving parts and a very short stroke to provide a rapid non-slam closure. This makes it a perfect choice for vertical and horizontal pipe configurations and is ideal for installations near sources of turbulence such as elbows, reducers, pumps and orifices. The DRV-Z model is well suited for small bore applications protecting critical equipment from reverse flow, containment isolation of pressure boundary penetrations, excessive tank vacuum and high energy line break isolation.