| 摘要 |
<p>The present invention provides a first embodiment of a high speed and low speed control valve utilizing hydraulic and pneumatic pressure in which a right side high speed solenoid (20), a right side low speed solenoid (21), a left side high speed solenoid (35) and a left side low speed solenoid (36) are constructed on the left and right sides of a spool (10) on an axis same as that of the spool to enable a high speed and low speed control, a right side high speed piston (12) in the form of an annular rod having two steps exists in the right side high speed solenoid (20), a right side low speed piston (13) having a right side speed adjusting bolt (14) exists in the right side low speed solenoid (21), a left side high speed piston (29) in the form of an annular rod having two steps exists in the left side high speed solenoid (35), and a left side low speed piston (29) having a left side speed adjusting bolt (14) exists in the left side low speed solenoid (36). Other aspect of the present invention provides a second embodiment or a third embodiment having a construction in which a spool (10) having a left side land (48), a middle and a right side land (49; 50) and left and right side projections (76; 77), a high speed piston in the form of an annular rod having two steps and a low speed piston having a speed adjusting bolt are sequentially arranged on an axis of the spool, a push rod is constructed in the high speed piston, a high speed solenoid wraps the outside of the high speed piston and a low speed solenoid wraps the outside of the low speed piston.</p> |
