| 摘要 |
<p>Air-valve unit has a valve seat (5) which has a hub element (515) connected with tubular wall (52) via seat body (512), which limits a fixing opening (5151) in seat body. The fixing opening runs along axis to set the inflation connection (513) in connection with the pipeline whereby the piston rod (81) has a further rod section (86), which runs from connection end (83) along the axis through the fixing opening which closes at head end. Air-valve unit has inflation connection in which the head end is placed, so that a movement of the piston rod along the axis relative to the system part (51) leads to a movement of the valve disk between the closing position and the opening position. The air valve unit further has a pre-stressing element (6) which is provided to set the head end of the rod section under initial stress in order to move the head-end away from the seat body (512) and in order to arrange at the valve disk (84) to be kept in the closing position. The air valve unit also has a detachable retaining device (57, 85), which is arranged between the hub element and the rod section, to block axial movement of the movable element relative to the system part against the pre-stress effect of the pre-stressing element, when the valve disk is placed in the opening position.</p> |
