Patent ID: 8438930

Claim:
A device especially adapted for attenuating and filtering selected pressure frequencies generated from a pressurized liquid tank to which the device is connected, comprising; a container having a sidewall, a bottom wall, and a top wall, open space within said container defining a sensing chamber; an inertia-tube extending into said container through said top wall and communicating with said sensing chamber, said inertia-tube having a distal end positioned above said bottom wall of said container; a thermal housing surrounding said container, said housing having a sidewall and a bottom wall spaced from said container, a gap between said container and said housing defining an annular space; a sensing port formed through said container, said sensing port having a first end communicating with said sensing chamber and a second end communicating with a sense line connected to the sensing port; a vent port formed on said sidewall of said container that enables purge gas within said sensing chamber to escape said device, thereby maintaining said liquid gas interface at equilibrium; wherein liquid from the pressurized tank fills said inertia-tube, and an amount of said liquid being maintained in said sensing chamber, and further wherein purge gas is introduced into said sensing chamber, wherein during equilibrium, the liquid within said sensing chamber resides below a level of the vent port, and when said device is out of balance by excess liquid in the sensing chamber, said device returns to equilibrium by displacing the liquid back into the tank.