The invention concerns an outlet valve system for a collection bag for urine from urine-incontinent or urostomy operated humans. Collection bags for urine are well known and typically consist of plastic sheets which are joined by welding along their peripheries to form a cavity between the sheets in which the urine is collected. When out of bed the user normally carry the bag by the lower part of the leg and in order to discharge urine from the bag, the bag is supplied with an outlet valve system at its lowermost part. The valve system comprises a base member which is secured to the collection bag and a movable member which is sealingly fixed to the base member; the base member has an open conduct leading into the cavity of the collection bag and conducting liquid to the movable member. The movable member has a discharge tube which is rotatably displaceable with respect to the base member and which is rotated out of the plane defined by the outer surface of the collection bag. The movable member has at least one open position and at least one secured closed position where the discharge tube is pointing upwards. In the open position is the discharge tube rotated to a position situated between more than 90.degree. and less than 180.degree. from upright vertical and here the discharge tube is secured.