Outlet valve reliability test

Standard : EN 997

5.7.5.4 Outlet valve reliability test

5.7.5.4.1 Test apparatus

The test apparatus comprises:

— a flushing cistern into which the outlet valve is mounted and which shall be filled through an inlet valve or an alternative filling device to accelerate the test;

— an automatic system allowing the flushing mechanism to be activated with a controlled force in the range of 25 N to 30 N and with a velocity of 5 cm/s in a period of 0,5 s to 1 s for the duration of the test. The system shall ensure that the outlet valve is fully closed before the flushing cistern is refilled;

— a water supply with a temperature of 7 °C to 25 °C.

5.7.5.4.2 Procedure

One cycle is carried out as follows:

— Fill the flushing cistern to the highest indicated water level indicated by the manufacturer.

— Actuate the flush operating mechanism by means of the automatic system.

— Allow the mechanism to close again.

— Refill the flushing cistern.

— In the case of single-flush mechanism, submit the cistern to 50 000 of these cycles (category I) or 200 000 of these cycles (category II).

— In the case of double-control mechanisms the test is carried out:

— either: with three reduced flushes followed by a full flush for a total of 50 000 flushes (category I) or 200 000 flushes (category II);

— or: with 37 500 reduced flushes followed by 12 500 full flushes (category I) or 150 000 reduced flushes followed by 50 000 full flushes (category II).

— Record any failure or permanent distortions of the outlet valve during and at the end of the test.

— 2 h after finishing of the cycles, verify the leaktightness in accordance with 5.7.5.3.