| 摘要 |
Non-return flap valve as a shut-off member for pipe conduits in power station construction or other installations, having a full passage cross-section in the direction of flow, in which the flap spindle is mounted in the interior of the housing and a lever in the form of a threaded bolt (18) with an adjustable and displaceable counterweight (19) is secured on the spindle sleeve (4.1) at an angle to the perpendicular plane of the sealing plate, the arrangement being such that there is an acute angle between the longitudinal axis of the threaded bolt (18) and the rear face of the sealing plate (4.2). <IMAGE>
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