Dalglish admits Shelvey is a talented player and will come back to Anfield better for the experience at Bloomfield Road.
"It's helpful to everybody. Jonjo's a very promising player for us but the difficulty for us is to get him a game," Dalglish told the club's official website.
"He needs games and it's a fantastic opportunity for Jonjo to do that.
"It's educational for us because we'll get to see him play and it'll also be educational for Jonjo because he's playing at a good level with a good club.
"It is important for us to use as many opportunities as we can to develop the players and if we can't give them games here then we've got to look to get them playing somewhere else.
"It's a chance for Jonjo to develop and push harder for a first-team spot here.
"We've put him out because we want him educated and to see him develop, not because we want to see him go. It's purely progress for him."