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

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

1976-04-15

1977-12-13

Croyle, Carlton R.

Pumps

Motor driven

Fluid motor

91308, 91313, 91316, F04B 1700, F04B 3500, F01L 2502

Patent

active

040626393

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.

REFERENCES:
patent: 208797 (1878-10-01), Craig
patent: 1536787 (1925-05-01), Grace
patent: 1624004 (1927-04-01), Miller
patent: 1816098 (1931-07-01), Thompson
patent: 3700360 (1972-10-01), Shaddock

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