Designing and selecting pressure regulating valves is not a secret science mastered only by a handful of experts. The procedure described below allows the user to select a suitable valve for a particular application with relatively little effort.
The calculations based on the so-called Kv value method have been considerably simplified compared with the very complex calculations given in IEC 534; they produce, however, results which for our purposes are sufficiently accurate.
The Kv value is an important parameter for the performance of the valve and thus decisive for valve selection. The flow coefficient Kv (m³/h) indicates the specific volume flow rate of a valve at a determined lift (conditions: pressure loss across the valve 1 bar, medium water 5 – 40°C).
Calculation of the Kv Value
The Kv value (application) is calculated from the given operating conditions of the application and allows the selection of the proper valve.