| 摘要 |
<p>A spool bore (4) where a spool (6) slides, a concave portion (23) opened to the spool bore (4) and facing a return port 12 opened to the spool bore (4), and a land portion (11) disposed in an outer periphery of the spool (6) are provided. A width of the concave portion (23) and a width of the return port (12) each are greater than a width of the land portion (11) and a groove bottom (23a) of the concave portion (23) is formed to be a flat plane generally in proportion to an axis line of the spool (6).</p> |
