Patent ID: 8123498

Claim:
A pulsation filter bottle for reducing pulsations associated with a gas compressor system, the compressor system having one or more cylinders connected to lateral piping; the pulsation filter bottle comprising: a rigid shell having a first port for gas transmission from or into the lateral piping and a second port for gas transmission from or into the cylinders; wherein the filter bottle is a volume-choke-volume device having at least two volumes separated by a baffle, and a choke tube for providing the only fluid communication between the volumes; wherein the choke tube has a primary conduit and one or more secondary conduits, each secondary conduit having a valve for opening and closing the secondary conduit, and each secondary conduit being the same length as the primary conduit; wherein the primary conduit and the one or more secondary conduits are not connected to the first port or second port, are internal to the shell, and are substantially parallel to each other and to the direction of flow of gas through the shell; wherein each valve may be selectively opened or closed, such that the conduits function as a single choke tube having a variable diameter; and wherein the dimensions of the volumes and the length and diameter of the conduits provide a predetermined acoustic response to the pulsations.