[en] An analysis tool is constructed for the purpose of predicting the fluid transient in a piping system as a consequence of (or in site of) a check valve being present in the system. The development of the check valve model along with its implementation into a fluid flow analysis computer program is documented. The analysis tool requirements are outlined and the valve flow and disk dynamics are established. A sample demonstration problem was run using the analysis tool and the results reported. Several supporting documents for the transient fluid flow analysis computer program are also included in the appendices