"I'm really looking forward to joining Port Adelaide as I've been really impressed with the club and, in particular, with the structures that Ken Hinkley has put in place," Dixon said.
Refell joined Port Talbot from Carmarthen Town in the summer, having previously played for Afan Lido.
Two players leaving Cardiff are 20-year-old midfielder Tommy O'Sullivan and striker Daniel Johnson, who have joined Port Vale and Stevenage respectively on one-month loan deals.
"When Dany joined Port Vale, it was agreed that if he received a more lucrative offer from elsewhere, and subject to us agreeing terms, he would be allowed to leave and I am a man of my word," said Smurthwaite.
He joined Port Vale on loan in 2006.
Shortly before he joined Port Vale, Horsfield fell victim to the swine flu pandemic.
Shortly after that match, Humphreys joined Port Vale on a month's loan.
In July 2009 he joined Port Vale for pre-season training, playing 45 minutes of a pre-season friendly.
Joining Port Vale as player-assistant manager in July 2009; twelve months later he was offered a contract at the club as a full-time assistant manager.
Hughes joined Port Vale the day after securing his exit from Notts County, as the BBC reported that "promotion-chasing boss Micky Adams wants to bring him in to add impetus to a Vale attack who have occasionally misfired this term".
