The present invention relates to fluid-absorbent articles, comprising a fluid-absorbent core comprising at least 60% by weight of fluid-absorbent polymer particles and not more than 40% by weight of cellulose based fibers and an acquisition-distribution layer comprising at least 90% by weight of synthetic non-cellulose based fibers and not more than 10% by weight of cellulose based fibers. The sun gear of the first planetary gear set is connected to the fifth shaft, which is attachable to the housing through a third brake. An isolation valve can be connected to the first conduit and configured to isolate the low pressure relief valve from the conduit when engaged.