A valve closure for a keg, e.g. incorporating an A-type valve arrangement, has a gas inlet port 11, a liquid dispensing port 12 and a valve member 6 to sealably close the gas inlet and liquid dispensing ports. A venting mechanism includes a detent 23 which can be activated by rotating the valve member 6 after the keg has been filled. This mechanism, when activated, primes a resiliently deflectable circumferential arm 22 to move the detent between the sealing face of the valve member 6 and its valve seat when the valve is next connected for dispensing. When the mechanism is not activated it does not interfere with the normal opening and closing of the valve, e.g. during filling
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