US 4,062,639 AGranted

Fluid motor-driven pump using fluid pressure to set position of pilot valve

AssigneeThe Hotsy Corporation

InventorGeorge D. Conlee

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Abstract

A high pressure pump comprising a valve body having a first housing secured at one of its ends to one end of the valve body and having a body member secured to the other end thereof. A second housing is secured to the body member with a piston rod movably extending through the body member and the first and second housings. A first piston secured to the piston rod and movably positioned in the first housing defines first and second chambers. A second piston secured to the piston rod and movably positioned in the second housing defines third and fourth chambers. Check valve means are in communication with the third and fourth chambers and sources of fluid to be pumped. The valve body has a pilot valve therein. The pilot valve means is connected to the piston rod so that the pilot valve means will be moved from a first position to a second position when the piston rod moves from a first position to a second position and vice versa. The valve body also has a main valve therein. A first passageway means fluidly connects the main valve means and the first chamber with a second passageway means fluidly connecting the main valve means and the second chamber. In their first positions, main valve means and the pilot valve means are fluidly connected so that hydraulic fluid under pressure will be supplied to the first chamber to cause the first and second pistons to move from their first positions towards their second positions. The piston rod moves the pilot valve means to its second position when the piston rod reaches its second position so that hydraulic fluid under pressure is supplied to the main valve means to move the main valve means to its second position so that hydraulic fluid under pressure is supplied to the second chamber to cause the first piston means to move towards its first position.

A fluid motor-driven pump comprising,

a pump work piston operating within a pump work chamber provided with inlet and outlet means, said pump work piston drivingly connected to a fluid motor,
said fluid motor comprising a motor piston fluidly movable in a cylinder alternately in opposite directions between first and second positions and having chambers on opposite sides thereof,
a pilot valve connected to said motor piston by a lost motion means and adapted to be physically moved alternately in opposite directions by said motor piston towards first and second positions,
a main valve adapted to be fluidly moved alternately in opposite directions between first and second positions,
a motor pump in fluid communication with said chambers through said main valve to move said motor piston between said first and second positions, and said main valve through said pilot valve to move said main vlave between said first and second positions, and said pilot valve through said main valve to move said pilot valve towards said first and second positions,
said piston being movable in one direction towards said first position by said motor pump fluid being in communication with one of said chambers, through said main valve when in said one position, to engagement with said pilot valve to move said pilot valve in said one direction and thereby place said motor pump in fluid communication through said pilot valve with said main valve to move said main valve to said second position whereupon said motor pump is placed in fluid communication through said main valve with the other chamber and said pilot valve to thereby fluidly move said pilot valve further in said one direction to said one position while moving said piston in the opposite direction relative to said pilot valve towards said second position for said motor piston whereupon said motor piston engages said pilot valve to move said pilot valve in the other direction and thereby place said motor pump in fluid communication through said pilot valve with said main valve to move said main valve to said one position whereupon said motor pump is placed in fluid communication through said main valve with said one chamber and said pilot valve to thereby fluidly move said pilot valve further in said other direction to said second position while moving said motor piston in said one direction towards said first position which is opposite the direction said pilot valve is moving.

3 more elements

Facts

Application

05/677,487Filed 15 Apr 1976 · continuation

Priority

6 Nov 1974

Granted

13 Dec 1977

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

F01L 25/063
Arrangements with main and auxiliary valves, at least one of them being fluid-driven: the auxiliary valve being actuated by the working…
F04B 9/105
Having only one pumping chamber: reciprocating movement of the pumping member being obtained by a double-acting liquid motor
F04B 9/113
With two mechanically connected pumping members: reciprocating movement of the pumping members being obtained by a double-acting liquid motor
F01L
Cyclically operating valves for machines or engines

Abstract

Claims4