influence of a backup- ring

Test Conditions
The coupler valves of the test couplers re opened by a blind opening pin. Continuous load With pressure impulses according SAE: 
Intensity: 600bar 
Mineral oil: IP Hydrus Oil 46 
Operating temperature: + 53° C 
Impulse Frequency: 1 Hz

Duration of the Test 
Until one of the test samples fails, causing leakage to the outside, due to the rupture of the seal ( with automatic shut off of the test bench ). Removal of the defective sample and continuation of the test until the next test coupler fails.

Result 
All test Samples without back-up ring fail after being subjected to 57.000 + 72.000 impulses. The designs with seal back-up rings, particularly the RAICO-Test Couplers with a special anti extrusion ring, perform faultlessly after more then 1 million cycles.