| 摘要 |
<p>PURPOSE: To sharply control the feeding volume of fluid medium by sealing an auxiliary closing member to an auxiliary valve seat connected in parallel to a valve seat in the power cutoff state by the force of an auxiliary spring and by providing the auxiliary valve seat with an opening cross section smaller than the valve seat. CONSTITUTION: The ratio of the cross section surrounded with a valve seat 32 to the cross section surrounded with an auxiliary valve seat 35 is approximately 40%, and a spring 34 and an auxiliary spring 37 are softly designed so that its sealing pressurization toward a closing member 33 or the valve seat 32 of an auxiliary closing member 36 or an auxiliary valve seat 35 is scarcely guaranteed under the power cutoff state. The inertia mass of the auxiliary closing member 36 is relatively small so that, when two solenoid coils 38, 39 are simultaneously driven, a auxiliary valve 41 is opened quicker than a main valve 40. The liquid pressure of the main valve 40 is thus reduced so that its opening speed is increased, and the passing cross section of the valve seat 32 of the main valve 40 can be enlarged, thereby increasing the volume flow feeding per unit hour correspondingly.</p> |
