Abstract / scope
ISO 4548-9:2007 specifies methods of measuring the effectiveness of either inlet or outlet anti-drain valves if fitted to a full-flow lubricating oil filter of the "spin-on" or "easy change" type, for internal combustion engines.
ISO 4548-9:2008Published
Methods of test for full-flow lubricating oil filters for internal combustion engines — Part 9: Inlet and outlet anti-drain valve tests
Méthodes d'essai des filtres à huile de lubrification à passage intégral pour moteurs à combustion interne — Partie 9: Essais des clapets antiretours aval et amont
A new edition is under development: ISO/DIS 4548-9.