SOLENOID VALVE

摘要

A first sleeve (19) has a plurality of axial grooves (32) in its inner surface. The grooves (32) are at the same distance with respect to the axis of the first sleeve (19) as viewed in a given section of the first sleeve (19). The grooves (32) have round sections, and they are deep in the inner surface (19a) enough to collect foreign particles. The grooves (32) have the same length as the first sleeve (19), and their ends are open on both ends of the first sleeve (19).