## Modeling Valve Closures using K Factors

A closed valve would have an infinite K-factor. Since infinity is not a possible input, AFT Impulse uses the convention of K = -1 (negative one) to represent a closed valve.

This input is only valid when defining a valve transient. To represent a valve that is closed in steady state, use the valve Special Conditions in the Optional tab.

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That Valve’s Got Character – Applying Pre-defined Characteristic Curves