：This article brief disscuss the primary structure and working principle of the valve position indicator in the immersion type hydraulic driving butterfly valve，and introduced the correct adjustive method of the valve position indicator.
简要叙述了浸液式液压驱动蝶阀阀位指示器的主要结构及工作原理，并介绍了阀位指示器正确调节方法。
The remoted digital display valve opening position dictator can show the opening degree of the valve.
介绍了新型阀位开度指示器的性能 ,该指示器利用霍尔式转速传感器将计量马达所排出的油液体积值转换成脉冲数 ,继而通过电子电路实现阀门开度的远传数