Importance

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Abstract

A compressor unloader system and method is disclosed, comprising a pneumatically controlled one-way valve member for controlling communication between an unloader chamber and a compression chamber of a compressor. The one-way valve member has one surface exposed to the pressure of the unloader chamber. To close it a control mechanism is actuated to present a lower pressure to an opposing second surface, interior of the valve member, creating a pressure differential to urge the one-way valve member toward a closed position. Temporary excesses of compression chamber pressures relative to unloader chamber pressures may bump the valve open to charge the unloader chamber with essentially maximum compression chamber pressure, thereby neutralizing the effect of the unloader chamber and fully loading the compressor. The one-way valve member is biased toward an open position. Thus, when the pressure differential is removed by exposing the second, opposing surface of the one-way valve member to the same unloader chamber pressure as that to which the first surface is exposed, the valve opens to unload the compressor. A method for controlling communication between an unloader chamber and a cylinder chamber of a compressor is also disclosed and claimed.

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First Claim