The valve closure (e.g. an A-type closure) has a closure body (1) for attachment to a container, a gas inlet port (14), a liquid dispensing port (25), and a valve member (6) to sealably close the gas inlet and liquid dispensing ports. An over-pressure relief valve (40) is configured to release gas from within the container in the event that an internal pressure limit is exceeded, and a user-operable depressurising lever (50) is arranged to permit the over-pressure relief valve to be manually opened. The over-pressure relief valve (40) comprises a plunger (53) which is urged against a seat (52) by a spring (57), and the depressurising lever (50) incorporates an abutment (58) for the spring (57). The plunger (53) includes an arrowhead formation (59) by which the depressurising lever (50) engages the plunger to hold the valve open during manual operation. The depressurising lever (50) incorporates an integral hinge (62) which also forms a frangible connection so that the lever becomes detached from the closure body and permanently opens the over-pressure release valve when manually operated.