Patent ID: 8291938

Claim:
An accumulator bottle comprising: a housing generally defining a first chamber and a second chamber; a first piston disposed within the first chamber; a spring disposed in the second chamber and configured to apply a first biasing force on the first piston; an interior wall disposed within the second chamber and generally defining a third chamber, wherein the third chamber is disposed in fluid communication with the second chamber and an external environment in which the housing is disposed; and a second piston disposed within the third chamber, wherein the second piston comprises a pressure compensation piston and is configured to divide the third chamber into a first region in fluid communication with the second chamber and a second region in fluid communication with the external environment, and to facilitate balancing of the pressure of a fluid disposed in the second chamber with the pressure of the external environment such that the magnitude of a second biasing force applied on the first piston by the pressure of the fluid depends at least in part on the pressure of the external environment.