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If your valve is leaking out the injection port, vent line(s), or the stator ring and stator interface, most likely the rotor seal has been scratched. When replacing the rotor seal, I always check the stator face assembly to make sure that it is not damaged. Any chip or crack on the ceramic stator face will damage a new rotor seal in just one turn. If the pressure setting of the valve has been exceeded, this can cause the valve to leak as well.