Injection pump having pilot and main injection

Details Injection pump having pilot and main injection Injection pump having pilot and main injection

1989-10-05

1991-06-04

Smith, Leonard E.

Pumps

Expansible chamber type

Pumping member position controlled port

123300, 123503, F04B 704, F02B 300

Patent

active

050209795

ABSTRACT:
The invention is drawn to a pump having a piston which is reciprocable within a cylinder. The cylinder has a closed end including a liquid outlet and port means to introduce a liquid into the closed end of the cylinder. The piston has on its peripheral surface a helical groove means fluidly connected to the closed end of the cylinder and a second groove to communicate the port with the closed end of the cylinder when the piston is in a position between a location in which the port directly communicates with the closed end of the cylinder and a location in which the port communicates with the helical groove means. The second groove in the peripheral surface of the piston is located between the helical groove means and the part of the piston adjacent to the closed end of the cylinder. The second groove also communicates with a cutaway portion in the wall of the cylinder that is coaxial with the axis of the port.

REFERENCES:
patent: 3792692 (1974-02-01), Kiley

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