Abstract: A safety device for a double valve arrangement for beer keg comprises a housing and a down pipe. A liquid valve and a gas valve are formed in the housing. A locking member is disposed between the down pipe and the housing, with two flaps protruding out of the housing to prevent the propping out of the valve arrangement from the beer keg when it is not intended. An inward bending connected to the locking member is in contact with a lower portion of the down pipe. When a special tap is engaged to push down a valve ring and the down pipe, the direction of the inward bending changes outwardly, which results in a changed position of the locking member, retrieving the flaps to the inside of the housing, making it possible to detach the double valve arrangement out of the beer keg.