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A compressor muffler includes a housing having an inlet end and an outlet end. A baffle arrangement extends from an interior surface of the housing. The baffle arrangement includes a surface capable of reflecting compressed fluid to attenuate noise. A valve assembly is disposed inside the baffle arr

A compressor muffler includes a housing having an inlet end and an outlet end. A baffle arrangement extends from an interior surface of the housing. The baffle arrangement includes a surface capable of reflecting compressed fluid to attenuate noise. A valve assembly is disposed inside the baffle arrangement. The valve assembly is positionable between a first position and a second position. The valve assembly also includes a valve surface that at least partially prevents flow of fluid through the housing from the outlet end when the valve assembly is in the first position.

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The invention claimed is: 1. A compressor muffler comprising: a housing having an inlet end and an outlet end; a baffle arrangement extending from an interior surface of the housing, the baffle arrangement comprising a surface capable of reflecting compressed fluid to attenuate noise; a valve assem

The invention claimed is: 1. A compressor muffler comprising: a housing having an inlet end and an outlet end; a baffle arrangement extending from an interior surface of the housing, the baffle arrangement comprising a surface capable of reflecting compressed fluid to attenuate noise; a valve assembly being disposed inside said baffle arrangement, the valve assembly being positionable between a first position and a second position, the valve assembly further comprising a valve surface that at least partially prevents flow of fluid through the housing from the outlet end to the inlet end when the valve assembly is in the first position by contacting the baffle arrangement; and wherein the valve assembly includes one or more openings permitting fluid flow through the valve assembly when the valve assembly is in the second position and wherein the openings have a total open area at least as large as a total cross-sectional area of the valve surface; and wherein the baffle arrangement is disposed to direct fluid flow substantially axially when fluid is passing through the baffle arrangement. 2. The muffler of claim 1, wherein the prevention of fluid flow from the outlet end to the inlet end by the valve assembly being in the first position limits undesirable noise resulting from a compression member rotating in a direction opposite to a direction of rotation during compressor operation. 3. The muffler of claim 1, wherein the valve assembly is disposed in the second position when the compressor is operating, the valve assembly being positionable in the second position by a flow of fluid entering the inlet end. 4. The muffler of claim 1, wherein the valve assembly is disposed in the first position when the compressor is deactivated, the valve assembly being positionable in the second position by a flow of fluid entering the outlet end. 5. The muffler of claim 1, wherein the valve assembly comprises a cylindrical member, the cylindrical member is configured to slide within the baffle arrangement between the first position and the second position. 6. The muffler of claim 1, wherein the valve assembly further comprises a stop member configured to position the valve assembly in one of the first position or the second position. 7. The muffler of claim 1, wherein the valve surface is arranged and disposed to reflect fluid traveling from the inlet end to provide noise attenuation. 8. The muffler of claim 1, wherein the valve surface includes one or more openings to permit at least some fluid flow from the outlet end to the inlet end to equalize the pressure across the housing when the valve assembly is in the first position. 9. A compressor muffler comprising: a hollow muffler body having an inlet end and an outlet end, the hollow muffler body comprising a baffle and one or more baffle tubes disposed in the hollow muffler body; a valve member being disposed in the one or more baffle tubes, the valve member being positionable between a first position and a second position; wherein fluid flow through the hollow muffler body is at least partially prevented by an end cap of the valve member at least partially covering the one or more baffle tubes when the valve member is in the first position, the one or more baffle tubes disposed to direct fluid flow substantially axially when fluid is passing through the baffle arrangement; and wherein the valve member includes one or more openings permitting fluid flow through the valve member when the valve member is in the second position and wherein the openings have a total open area at least as large as a total cross-sectional area of the end cap. 10. The muffler of claim 9, wherein the prevention of fluid flow from the outlet end to the inlet end by the valve member being in the first position limits undesirable noise resulting from a compression member rotating in a direction opposite to a direction of rotation during compressor operation. 11. The muffler of claim 9, wherein the valve member is disposed in the second position when the compressor is operating, the valve member being positionable in the second position by a flow of fluid entering the inlet end. 12. The muffler of claim 9, wherein the valve member is disposed in the first position when the compressor is deactivated, the valve member being positionable in the second position by a flow of fluid entering the outlet end. 13. The muffler of claim 9, wherein the valve member comprises a cylindrical body, the cylindrical body is configured to slide within the baffle arrangement between the first position and the second position. 14. The muffler of claim 9, wherein the valve member further comprises a stop member that is configured to position the valve member in one of the first position or the second position. 15. The muffler of claim 9, wherein the end cap includes one or more openings to permit at least some fluid flow from the outlet end to the inlet end to equalize the pressure across the housing when the valve member is in the first position.