Continuous valve position indicator

Abstract

The invention discloses a continuous valve position indicator. The continuous valve position indicator comprises an installation seat, wherein a sensing pressure-bearing sleeve pipe is arranged on theupper end surface of the installation seat; a communication pressure-bearing sleeve pipe is arranged on the lower end surface of the installation seat; the other end of the communication pressure-bearing sleeve pipe is communicated to a valve body flange; one end away from the installation seat, of the sensing pressure-bearing sleeve pipe, is sealed; and the other end of the sensing pressure-bearing sleeve pipe communicates with the communication pressure-bearing sleeve pipe through the installation seat. The continuous valve position indicator further comprises a movable rod assembly, wherein the movable rod assembly comprises a connection rod; the lower end part of the connection rod penetrates through the valve body flange, extends into a valve body and synchronously moves with a valveelement; an iron core is hermetically arranged in the upper end part of the connection rod; the upper end part of the connection rod extends into the sensing pressure-bearing sleeve pipe; and an annular groove is formed in the sensing pressure-bearing sleeve pipe. The continuous valve position indicator further comprises a sensing coil wound on the sensing pressure-bearing sleeve pipe, wherein the sensing coil is located in the annular groove; the thickness of the sensing pressure-bearing sleeve pipe is greater than or equal to 5mm; and the number of windings of the sensing coil under the unit height is 8000-10000.

Description

technical field [0001] The invention relates to the field of reactor valves, in particular to a valve position indicator applied to valves in reactor environments. Background technique [0002] Position indicators have been developed in many forms so far, which can be roughly divided into two types: point type and continuous type. The LVDT continuous position indicator used for valve opening height measurement mainly includes sensors, iron cores and transmitters. For easy installation, LVDT continuous position indicators usually integrate sensor coils, transmitters and electronic circuits, and the iron core is either integrated with the sensor or separated from it. When measuring the displacement, through the electromagnetic coupling between the primary coil and the secondary coil, the position change of the iron core has a linear relationship with the difference between the output voltages of the two secondary coils, which can be applied to the measurement of the linear di...

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Problems solved by technology

[0004] (1) The sensor or the iron core guide rod is in direct contact with the device under test. When measuring the valve opening height under high temperature conditions, the maximum operating temperature of the sensor may be exceeded, resulting in unstable operation of the sensor or direct damage to internal electronic components. ;

[0005] (2) Due to the limitation of the integrated structure, the winding density of the sensor coil is limited

Under high-pressure conditions, the thickness of the pressure-bearing boundary of the device easily exceeds the sensing distance of the sensor coil, and the sensitivity and accuracy are affected;

[0006] (3) When measuring the displacement in the high temperature and high pressure radioactive medium, the separated iron core is directly in contact with the medium, which is easy to corrode

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