ISO 4548-9:2008 specifies test methods for evaluating the effectiveness of inlet and outlet anti-drain valves fitted to full-flow lubricating oil filters of the spin-on or easy-change type for internal combustion engines. It covers basic performance tests for measuring oil leakage and supplementary procedures for determining valve opening pressure and flow-versus-head characteristics. The standard includes test rig requirements, test liquid specifications, procedures for inlet and outlet anti-drain valves, and test report requirements.
Application Scope: Intended for filter manufacturers, engine manufacturers, testing laboratories, quality engineers, and technical professionals evaluating anti-drain valve performance in full-flow lubricating oil filters.
