| 摘要 |
A liquid pump having a piston head carried by a piston rod and located in a cylinder between an inlet and outlet, the head being of a type that enables passage of fluid in the cylinder from the inlet side of the head to the outlet side upon head movement in a first direction, and delivering fluid on the outlet side of the head to the outlet and drawing fluid from the inlet into the inlet side upon head movement in the opposite second direction. A motor means includes a rotatable eccentric engageable with a follower carried by the piston rod to urge the piston means away from one limit of its movement and in the first direction, while a spring tends to return the piston means to said one limit of its movement in the second direction. A check valve communicates with the outlet and enables fluid flow only in the direction from the cylinder through the outlet, and a metering valve means communicates with the outlet and regulates liquid flow delivered by the piston means through the outlet at a predetermined rate.
|
