| 摘要 |
PCT No. PCT/NZ94/00116 Sec. 371 Date Oct. 18, 1996 Sec. 102(e) Date Oct. 18, 1996 PCT Filed Oct. 20, 1994 PCT Pub. No. WO95/11428 PCT Pub. Date Apr. 27, 1995Apparatus for delivering constant quantities of fluid, comprises a chamber, a piston (6) reciprocally movably within the chamber, a fluid inlet (3) to the chamber on one side of the piston, and a fluid outlet (5) from the chamber on the other side of the piston (6). A valve (12) through the outlet side of the chamber to the fluid outlet (5). Spring means (10) urges the piston (6) and subsidiary spring means (16) urges the valve (12) through the piston (6) towards the inlet side of the chamber, such that fluid pressure on the inlet side of the chamber will cause the piston (6) to move to eject a predetermined quantity of fluid from the outlet side, and on the return stroke fluid will flow through the valve (12) in the piston (6) to refill the outlet side for the subsequent piston delivery stroke.
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