Patent ID: 9079142
Filing Date: 2015-07-14
Classification: B01F,F04B,Y10T

Abstract:
1. A hydraulic pump for adding a predetermined volume of additive fluid to a primary fluid, the pump comprising: a main body having a first inlet for receiving a primary fluid, a second inlet for receiving an additive fluid, and an outlet for discharging a fluid, wherein the fluid comprises a fluid mixture of the primary fluid and the additive fluid or the primary fluid; a piston sealingly mounted in the main body for reciprocating movement in response to flow of the primary fluid through the main body, the piston dividing the main body into a first and a second chamber; a first valve for selectively transmitting the primary fluid from the inlet into the first and second chambers; a second valve for selectively transmitting the fluid from the first and second chambers to the outlet; an operable interconnection between the piston and the first and second valves comprising: a linkage mechanism and a spring attached thereto and responsive to the reciprocating movement of the piston for alternating the first and second valves between a first state, wherein the first valve transmits primary fluid from the first inlet to the first chamber and the second valve transmits fluid from the second chamber to the outlet, and a second state, wherein said first valve transmits primary fluid from the first inlet to the second chamber and the second valve transmits fluid from the first chamber to said outlet; an extractor piston attached to the piston and sealingly mounted in a third chamber formed therein the main body; a source of additive fluid communicably connected to the third chamber; and the extractor piston slidably mounted in the third chamber such that the extractor piston reciprocates in response to movement of the piston for pumping additive fluid from the source through the second inlet to the second chamber.