problems with drysuit dump valve

In the end I tapped it with my torch, and out the air came!

I will be diving again tomorow night and will see how it goes, but I guess I need a new valve.

Dave,

In that case, have you tried thoroughly cleaning both valve and seats, talcing the rubber before the dive - as well as then tapping relatively sharply on the valve?

IIRC, it is only the first air-dump of the first diving day that then needs the prompt of tapping the valve.

Mike