US Patent 7959421 Compressor having a shutdown valve

A compressor includes a shell, a compression mechanism supported within a suction pressure region of the shell and including a discharge outlet in communication with the discharge chamber, and a discharge valve assembly. The discharge valve assembly includes a valve member, a valve stop including an opening therethrough, and a communication member defining a fluid passage and extending into the discharge chamber from the valve stop toward the discharge outlet in the discharge chamber to provide fluid communication between the opening in the valve stop and a location downstream of the valve stop.