Patent ID: 8028841
Filing Date: 2011-10-04
Classification: B01D

Abstract:
1. Apparatus for balancing net longitudinal pressure on a reciprocating and rotating element, including a first chamber receiving a first end of said reciprocating element, a second chamber receiving a second end of said reciprocating element, said first and second chambers substantially sealed about their respective ends of said reciprocating element so that said reciprocating element acts as a piston therein during reciprocation, said first and second ends of said reciprocating element configured to have substantially the same effective longitudinal pressure area on each end on which any longitudinal pressure acts, a passage through said reciprocating element connecting said first and second chambers to substantially equalize the pressure in said first and second chambers, so that the substantially equalized pressure acts on the said substantially the same effective longitudinal pressure area on each end of the reciprocating element, resulting in a substantially balanced net longitudinal force acting upon the reciprocating element.