| 摘要 |
<p>PURPOSE:To ensure two spools being free from such a position as to be connected to each other simultaneously by specifying a space between the two spools and the travel distance of the respective spools. CONSTITUTION:Right and left spools 16a and 16b can contact with each other, and they are separated at a space W in a disconnected position. Also, in the disconnected position the land 17a of the spool 16a is in contact with a sleeve 9a at a length La, and the movement of the spool 16a by a length La will cause an inflow passage 14a and an outflow passage 15a to be changed over to a connected state from a disconnected state, to each other. Similarly the movement of the spool 16b by a distance Lb will cause an inflow passage 14b and an outflow passage 15b to be changed over to the connected state from the disconnected state, to each other. Furthermore, the correlation of W<=La+Lb applies in the disconnected position.</p> |
