Prison officers at a regional correctional facility have walked off the job after a man who assaulted four guards was sentenced to what the union claimed was a "slap on the wrist".

Cameron Reginald Welsh, 26, was on October 29 sentenced to a three-year good behaviour order, a community-based sentence, in Cessnock Local Court, in the NSW Hunter Valley.

The sentence was handed down for four counts of assaulting a law enforcement officer and inflicting actual bodily harm.

The Public Service Association of NSW issued a media release on October 30 saying prison officers from Cessnock Correctional Centre walked off the job in response.

The statement said prison officers at Bathurst Correctional Centre also walked off the job, with prison officers at all of the state's 36 jails expected to fo

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