a ball valve for medium and low pressure service includes a valve body , a valve member positioned in the valve body , circlips attached to the valve body , and provided at the upstream side and downstream side of the valve member , and sealing members provided between respective of the circlips and the valve member . the circlips are urged toward the valve member via the sealing members and are kept in a floating state . the valve member is of spherical shape , having a first and a second fluid passage holes and a valve stem groove and does not include a seam .