Leakage preventing liquid supply pump

Details Leakage preventing liquid supply pump Leakage preventing liquid supply pump

F - Mech Eng,Light,Heat,Weapons

04

B

103/44

F04B 15/00 (2006.01) F04B 53/06 (2006.01) F04B 53/12 (2006.01)

Patent

CA 1243546

-12- ABSTRACT OF THE DISCLOSURE A liquid supply pump adapted for coupling to a reciprocable motor, particularly for pumping liquids having thermosetting properties. The pump incorporates a double-acting piston [35] in a pumping cylinder [30], driven by an elongated drive shaft [16] which projects from the top of the pump for reciprocable motion, the pump having a lower intake valve [12] and an upper exhaust valve [41], and an intermediate drive shaft seal [57] above the pumping cylinder and a liquid and air drive shaft seal [64] proximate the point of projection of the drive shaft from the pump, wherein said two seals are spaced apart by a distance greater than the pump stroke length, and a liquid drainage path [58] from the intermediate seal back to the pump intake region, and an outer cylinder [13] concentrically positioned about the pumping cylinder and enclosing the liquid drainage path.

509520

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