Fellow opener O'Brien made 24 before his drive off Collymore was well caught by Anyon at wide mid-on.
BBC: Hall starts with a win as Northants squeeze past Sussex
Anyon has started the last seven matches for Vale, after missing 11 months of football with a broken leg.
BBC: Micky Adams undecided on Port Vale goalkeeper Joe Anyon
Starting day three on 183-5, hosts Glamorgan were dismissed for 248 as seamer Anyon added another three wickets to his tally from Saturday.
Ian Bell took another catch when John Sadler was turned round by Jimmy Anyon and Carter did real damage in his second spell after lunch.
Former Sussex player Smith then helped add a further 17 before he was athletically taken down the leg side by Matt Prior off James Anyon.
Anyon himself forced Sales to play on to leave Northants on 57-3, before Rob White was caught and bowled by Rayner in the first over after tea.
BBC: Hall starts with a win as Northants squeeze past Sussex
The Vale boss is trying to seek cover for keeper Joe Anyon who is recovering from a broken leg, and he has no recognised left-back on his books.
Jamie Pipe survived the hat-trick ball but was caught off a lifting delivery from Anyon and captain Rikki Clarke was lbw when he played across the line at Carter.
While the man he replaced in goal, Joe Anyon, clearly has talent, he was enduring a difficult time and his absence because of illness provided an opportunity for Carson.
Hemp - who had been dropped on 29 by Ant Botha in the gully off Anyon - eventually fell when he was caught behind off Trott's first over of the innings.
Then came the collapse, but Lee Daggett substantially improved his career-best 12 not out by contributing 33 to the last-wicket stand with James Anyon, who equalled his best with an unbeaten 37.
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Anyon won Vale's player-of-the-year-award in 2009 but broke his leg in the 2-1 defeat at Chesterfield in March of the same year and has been restricted to just seven starts this season.
Mustard gave the Durham chase a flying start, racing to 50 from 33 balls, but after 10 fours and a big six over mid-wicket off Alex Loudon, he dragged an attempted pull off Anyon into his stumps.
BBC: SPORT | Cricket | Counties | Durham claim remarkable victory
His deputy, Chris Martin, had been one of the star performers in the team this season, but with Anyon out of contract in the summer, Adams chose to give the former Blackburn trainee a chance to prove he is worthy of another deal at Vale Park.
BBC: Micky Adams undecided on Port Vale goalkeeper Joe Anyon
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