Patent ID: 6834680
Filing Date: 2004-12-28
Classification: E21B,F15B

Abstract:
The method of providing a piston type accumulator with compressed gas in a first chamber on one side of a piston and hydraulic fluid in a second chamber on the opposite side of said piston and with a controlled depth liquid shield on the top of a piston separating said pressurized gas from the seals on said piston comprisingproviding a portion of the gas in a first portion of said first chamber above said piston and a portion of the gas in a second portion of said first chamber not above said piston such that excess liquids accumulating said first portion of said first chamber above the piston can be vented into said second portion of said second chamber for venting to a location outside of said first chamber, using the gas pressure in said second portion of said first chamber to expel a portion of the excess liquids from said second portion of said first chamber, and using the level of the excess liquids in said second portion of said first chamber to raise a float to open a valve to allow the gas pressure in said second portion of said first chamber to expel the excel liquids from said second portion of said first chamber.