The reason your kite turned inside out was because you kept riding towards it when it crashed, slackening the lines. Mine did the same thing last weekend. If you read this thread, people gave me some advice on this happening.
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=36957It does not necessarily mean you dont have enough air in it as mine was pumped up hard as hell. When you say inside out, you mean that the kite basically did a 360 on its long axis, crossing the lines right? Or do you mean that your kite flew trailing edge first!?

As for the valve blowing I've got no idea. Cabrinha valve covers screw on and dont come loose.