| 摘要 |
<p>A gate (30) is displaced by a rotor (40, 50) to and from a closing position wherein it is opposite an orifice (26) to be closed in the valve body (22). An angular clearance (J) is provided between the rotor and the gate and the gate is radially mobile relative to the rotor. A link rod (60) is supported in articulation on the rotor (30, 50) and on the gate (30) to transform the rotor rotation (arrow F) on the angle J into a radial displacement of the gate stopped in closing position, so as to apply it tightly on the periphery of the orifice (26). Springs (66, 68) radially return the gate into retracted position when it is displaced to an open position so that no friction occurs between the moving gate and the valve body.</p> |
