Valve positioner having adjustable gain
    6.
    发明授权
    Valve positioner having adjustable gain 失效
    阀门定位器具有可调增益

    公开(公告)号:US5345856A

    公开(公告)日:1994-09-13

    申请号:US25173

    申请日:1993-03-02

    IPC分类号: F15B13/16 G05D16/18

    CPC分类号: F15B13/16 G05D16/18

    摘要: A valve positioner has a pneumatic transducer responsive to a signal pressure for displacing a spool valve away from a neutral position to effect actuation of an actuator output shaft and further includes a gain adjustment apparatus. The pneumatic transducer includes a balance beam being operably connected at one end to the spool valve and at the other end to a hinge spring. A clamp mechanism is attached to the hinge spring and is slidably adjustable along the length of the hinge spring to vary the spring characteristics. The hinge spring tapers in thickness such that the spring increases in thickness in a direction from a first end of the spring towards the balance beam. A window or cut-out is also provided in the hinge spring to further assist in varying the spring characteristics as the clamp mechanism is moved along the hinge spring, and provide a wide range of gain adjustment over the single spring.

    摘要翻译: 阀定位器具有响应信号压力的气动传感器,用于将滑阀从中性位置移开,以实现致动器输出轴的致动,并且还包括增益调节装置。 气动换能器包括平衡梁,该平衡梁在一端可操作地连接到滑阀上,另一端可操作地连接到铰链弹簧。 夹紧机构附接到铰链弹簧并且可沿着铰链弹簧的长度可滑动地调节以改变弹簧特性。 铰链弹簧的厚度变薄,使得弹簧在从弹簧的第一端朝向平衡梁的方向上增加厚度。 铰链弹簧中还设置有窗口或切口,以进一步帮助改变弹簧特性,因为夹紧机构沿着铰链弹簧移动,并且在单个弹簧上提供宽范围的增益调节。