Costas,
I'm assuming that you're talking about about relatively small bore hose, starting at 10 mm but no bigger than 30 mm. Connectors/couplings in this range are usually proprietary and subject to patent protection. There are no codes specific to self sealing quick couplings. If a connection is threaded, the thread will usually be machined to a standard form. Testing is usually done to meet industry norms, eg test pressure at 1.5 times maximum working pressure.
I don't know if this is relevant to your situation but if the coupling has an elastomeric seal, either as the main seal or as a back-up, always check that the seal is compatible with the fluid being carried.
Regards