Relief valve reliability test

Standard: EN 997

5.7.5.4 Discharge Valve Reliability Test

5.7.5.4.1 Test Setup

The test setup includes the following:

• A reservoir equipped with a discharge valve and to be filled via a filling valve or, alternatively, a filling device to accelerate the test,
• An automatic system that ensures the washing mechanism activates with a controlled force between 25 N and 30 N and an acceleration of 5 cm/s within a time interval of 0.5 to 1 second. The system must ensure that the valve is completely closed before the reservoir is refilled.
• Water with a temperature between 7°C and 25°C.

5.7.5.4.2 Test Procedure

A test cycle is applied as follows:

When different alternative water levels are specified for the test, the highest level in the reservoir is used.

• The reservoir is filled to the highest washing water level specified by the manufacturer.
• The washing process is carried out by draining the water from the reservoir through the automatic system.
• The discharge group closes automatically.
• The reservoir is refilled.
• For single-wash function mechanisms, the mechanism is subjected to 50,000 cycles (Class 1) or 200,000 cycles (Class 2).
• For dual-wash function mechanisms:

- A total of 50,000 washes (Class 1) or 200,000 washes (Class 2), with one full wash after three reduced washes,

- Or 12,500 full washes after 37,500 reduced washes (Class 1) or 50,000 full washes after 150,000 reduced washes (Class 2) are applied.

• Any defects or permanent deformation in the discharge valve during or at the end of the test is recorded.
• 2 hours after the cycles are completed, the tightness is checked according to Article 5.7.5.3.