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FlowCon Valves - IEC60534-4 Leakage Classification

By Jesper Fischer Nielsen, Application Engineer, M.Sc (EnergyTech), FlowCon International ApS, Denmark - Updated 03.2021

FlowCon International complies with the International Standard IEC60534-4 regarding leakage specification. The data used is taken from the International standard IEC60534-4. Sections of the standard are high-lighted in this document, making it possible to calculate the maximum leakage according to the standard

1. General

Specified leakage test is carried out 100% on each insert/valve.


2. Test Medium

Test medium shall be liquid and at a temperature of 20°C.


3. Water

Test medium shall be clean water and with maximum 50% glycol.


4. Air Pockets

Care shall be taken to eliminate air pockets inside the valve housing and piping.


5. Test Pressure

Hydrostatic shell test pressure shall be according to the design code or standard for the valve housing or, alternatively, it shall be no less than 1.2 x the 20°C rated pressure, whichever is appropriate.


6. Test Actuator

The actuator shall be adjusted to meet the operating conditions according to FlowCon’s specifications. The required closing thrust or torque, as a spring or other means, shall then be applied. No allowance or adjustment shall be made to compensate for any difference in seat load obtained when the test differential is less than the maximum valve operating differential pressure.

The test medium shall be applied to the valve housing inlet. The valve housing outlet may be open to the atmosphere or connected to a low head-loss flow measuring device with its outlet open to the atmosphere.

The valve shall be opened, and the valve housing assembly filled completely, including the outlet portion and any downstream connected piping. The valve shall then be closed. When the leakage flow rate has been stabilized, the rate of flow should be observed over a sufficient period to obtain the accuracy specified class IV and V.

The maximum allowable seat leakage as specified for each class shall not exceed the values resulting from the test method as defined.


7. Pressure

The test pressure must be minimum 50% of the maximum operating differential pressure across the valve.


8. Leakage Class

The leakage rate thus obtained can then be compared to the calculated values for classes II, III, IV and V. Classes IV and V are relevant for the included FlowCon valves.......

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