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1. 发明授权

US5644948A Control valve with a drive operated by a pressure medium and a position controller 失效
标题翻译：控制阀带有由压力介质操作的驱动器和位置控制器
公开(公告)号：US5644948A
公开(公告)日：1997-07-08
申请号：US459492
申请日：1995-06-02
申请人： Thomas Karte , Heiko Kresse , Alexander Kleist , Wolfgang Backe
发明人： Thomas Karte , Heiko Kresse , Alexander Kleist , Wolfgang Backe
IPC分类号： F15B21/08 , G05D3/12 , G05D3/14 , G01N19/02
CPC分类号： G05D3/12 , F15B21/087 , G05D3/14 , G05B2219/34131 , G05B2219/41154 , G05B2219/42128 , G05B2219/42211 , G05B2219/45006
摘要： An apparatus and process for monitoring conditions of a control valve including a valve element operated by a drive controlled by a position controller. A spindle extends into a valve chamber through a dynamic seal and connects the valve element to the drive. The condition of the seal is monitored by measuring start-up time, stopping time and distance travelled. The start-up time relates to the time between application of control current to the position controller and sensing movement of the valve element. The stopping time relates to the interval between application of a second control current to the position controller and sensing the valve element has stopped. The distance travelled relates to distance the valve clement travels during the stopping time. A time difference is determined by subtracting the stopping from the starting time and is calibrated to a seal coefficient of friction. The distance travelled is also calibrated to a seal coefficient of friction. These two coefficients of friction are compared whereby a discrepancy indicates a change in air pressure has occurred during valve operation. These measurements are taken prior to and cyclically during valve operation. The coefficient of friction obtained during valve operation is compared with the coefficient of friction obtained prior to valve operation to indicate a change in the condition of the seal. If a change in air pressure occurred during valve operation, the coefficient of friction obtained by calibrating the travel distance is compared with the coefficient of friction obtained prior to valve operation.
摘要翻译：一种用于监视包括由位置控制器控制的驱动器操作的阀元件的控制阀的状态的装置和过程。主轴通过动态密封件延伸到阀室中，并将阀元件连接到驱动器。通过测量启动时间，停止时间和行驶距离来监控密封条件。启动时间与控制电流施加到位置控制器和感测阀元件的运动之间的时间有关。停止时间与施加第二控制电流到位置控制器之间的间隔以及感测阀元件已停止。行驶距离与阀门在停车期间行驶的距离有关。时差通过从起始时间减去停止并被校准为密封摩擦系数来确定。行进的距离也被校准为密封摩擦系数。比较这两个摩擦系数，由此这种差异表示在阀操作期间发生空气压力的变化。这些测量在阀门操作之前和周期性地进行。将在阀操作期间获得的摩擦系数与在阀操作之前获得的摩擦系数进行比较，以指示密封条件的变化。如果在阀门运行期间发生气压变化，则将通过校准行驶距离获得的摩擦系数与阀操作之前获得的摩擦系数进行比较。

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