Patent ID: 7922457

Claim:
A compressor system operable to shutdown in response to a shutdown signal, the compressor system comprising: a compression device including a fluid intake and a fluid output, the compression device operable between a first speed and a second speed to produce a flow of compressed fluid at an output pressure from a flow of fluid at an intake pressure; a blowdown valve positioned downstream from a lubricant/fluid separator and movable between a closed position and an open position in which at least a portion of the flow of compressed fluid passes through the blowdown valve to reduce the output pressure of the flow of compressed fluid; a sensor positioned to measure a downstream pressure and generate the shutdown signal in response to a measured downstream pressure in excess of a predetermined pressure; and a controller operable to move the blowdown valve to the open position and set the speed of the compression device to a low set point speed in response to the shutdown signal, in order to decrease the output pressure to a level below the operating pressure range; and further comprising a timer operable to monitor the passage of time, and wherein the controller reduces the compression device speed to a third speed below the low set point speed in response to the passage of a first predetermined period of time.