| 摘要 |
<p>PURPOSE: To enable the abrasion of a valve opening mechanism which forcibly opens a suction valve or a discharge valve, to be eliminated, also enable the durability of the whole of a pump to be enhanced, and concurrently enhance the responsiveness of the valve which is forcibly opened. CONSTITUTION: An one-way side valve out of a suction valve 4 and a discharge valve 5 which are opened/closed by the reciprocal drive of a plunger 2, is made out of magnetic material, a solenoid 9 is provided for the front side in the opening direction of the one-way side valve, which has a fixed magnetic core 91 rushing into a fluid passage 71, and can keep the valve open by sucking the one-way side valve in the valve open direction with a coil 92 energized, it is made impossible when no fixed magnetic core is moved that any pumping operation is carried out with the valve sucked in, and it is thereby made possible that an unload operation is carried out.</p> |
