Do you value bet this river?

[Cardzy]

It wouldn't even be a question, but SB is a tight player. I THINK he has the flush but hard to put him on that since he called on the flop with just a backdoor flush draw? Maybe he limped in preflop with A7, 76s, etc. He very well could have that 7.

Anyway, what do you think? Value raise this river or not?

Party Poker 2/4 Hold'em (8 handed) converter

Preflop: Hero is BB with 4[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img].
UTG folds, UTG+1 calls, MP1 folds, MP2 calls, CO folds, Button calls, SB completes, Hero checks.

Flop: (5 SB) 2[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG+1 calls, MP2 folds, Button folds, SB calls.

Turn: (4 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG+1 calls, SB calls.

River: (7 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="blue">Hero ???</font>