Patent ID: 9632515
Date: 2017-04-25
CPC Classifications: F04B,F16L,G05D,Y10T

Claim:
1. A pressure stabilizing system for a hydraulic pump, the hydraulic pump comprising a lower-pressure input for receiving an input fluid at a first pressure and a higher-pressure output for outputting an output fluid at a second pressure, the first pressure being lower than the second pressure, the pressure stabilizing system comprising: a frame defining: a piston chamber, a lower-pressure circuit, a lower-pressure inlet/outlet and a higher-pressure inlet, the piston chamber having a first section and a second section, a circumference of the first section of the piston chamber being smaller than a circumference of the second section of the piston chamber, the first section of the piston chamber connecting the lower-pressure circuit and the higher-pressure inlet, the lower-pressure circuit further connecting with the second section of the piston chamber, the lower-pressure circuit being connected to the lower-pressure input of the pump through the lower-pressure inlet/outlet and receiving a lower-pressure fluid, the higher-pressure inlet being connected to the higher-pressure output of the pump and receiving a higher-pressure fluid from the higher-pressure output of the pump, a pressure of the lower-pressure fluid being lower than a pressure of the higher-pressure fluid, the pressure of the lower-pressure fluid being substantially equal to the pressure of the input fluid received by the lower-pressure input of the pump, the pressure of the higher-pressure fluid being substantially equal to the pressure of the output fluid outputted by the higher-pressure output of the pump; a piston slidably movable in the piston chamber between an open position and a closed position, the piston having a first portion with a first surface and a second portion with a second surface, the first surface being smaller than the second surface, a length of the first portion of the piston slidably moving in the first section of the piston chamber, the second portion of the piston slidably moving in the second section of the piston chamber, the piston defining at an end of the first portion opposite to the second portion a tip, when the piston is in a closed position the tip fully closes the higher-pressure inlet and when the piston is in an open position the tip opens the higher-pressure inlet, the piston slidably moving between the closed and open position upon relative pressure variation between the lower-pressure fluid and second surface in the second chamber with respect to the higher-pressure fluid and first surface in the first chamber of the piston chamber; a first seal for sealing the first portion of the piston in the first section of the piston chamber while allowing movement between the open and closed position; a second seal for sealing the second portion of the piston in the second section of the piston chamber while allowing movement between the open and closed position; and the first and second seals forming there between a buffer zone substantially free of fluid; wherein the lower-pressure circuit receives the lower-pressure fluid and combines the lower-pressure fluid with the higher-pressure fluid received at the higher-pressure inlet when the piston is in the open position, the lower-pressure fluid combined with the higher-pressure fluid being outputted via the lower-pressure inlet/outlet to the lower-pressure input of the pump.