| 摘要 |
<p>A fluid injector (11) having an actuating chamber (18), an injection chamber (37), a fluid outlet (45), a piston (31) movable relative to the chambers (18, 37), and passages (13, 15) for connecting the actuating chamber (18) to a supply of fluid to cause movement of the piston in opposite directions between a first advanced position and a second retracted position. Passages (29, 42, 43) provide communication between the actuating chamber (18) and injection chamber (37) when the piston (31) is approaching or is in its second position for charging the injection chamber (37) with fluid through the actuating chamber (18). Movement of the piston (31) away from the second position towards the first position causes fluid charged into the injection chamber (37) to be displaced therefrom and fluid to be supplied through the fluid outlet (45).</p> |
