Device capable of freely adjusting flow for valve positioner

Abstract

The invention discloses a device capable of freely adjusting flow for a valve positioner. The device comprises a device body, and a first air inlet, a first air outlet and a throttle lever opening areformed in the surface of the device body; and a first air channel communicating with the first air outlet and the first air inlet and a throttle lever channel communicating with the throttle lever opening in a matched manner are arranged in the device body, the throttle lever channel communicates with the first air channel in a crossed manner, and a communicating opening is formed in the crossedconnecting position of the throttle lever channel and the first air channel. According to the device, a throttling rod is arranged in the throttling rod channel of the device body, a blocking part anda first through hole part are arranged on the side face of the top of the throttling rod, a second through hole part is arranged at the top end of the throttling rod, and the effect of adjusting theflow of an output air source of the valve positioner is achieved through the through hole parts and the blocking part of the throttling rod.

Description

technical field [0001] The invention relates to the technical field of valve positioners, in particular to a device for valve positioners that can freely adjust flow. Background technique [0002] The valve positioner is the main accessory of the control valve. It uses the valve stem displacement signal as the input feedback measurement signal and the controller output signal as the setting signal for comparison. When there is a deviation between the two, it changes its output to the actuator The signal makes the actuator act, and establishes a one-to-one correspondence between the displacement of the valve stem and the output signal of the controller. Therefore, the valve positioner forms a feedback control system with the valve stem displacement as the measurement signal and the controller output as the setting signal. The manipulated variable of the control system is the output signal of the valve positioner to change the action of the actuator. [0003] Since the elect...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device for valve positioner that can freely adjust the flow rate to solve the above-mentioned background technology: in the prior art, some such devices do not have a throttling structure, and some have The throttling structure, the one without throttling structure generally adopts the way of adding throttling plate to throttling, while the usual valve positioner pressure gauge module with throttling structure usually adopts the structure of conical throttling rod to throttling, in In actual application, the method of adding a throttling plate is cumbersome to operate, and it can only be a fixed flow rate. However, the conical throttling structure cannot effectively adjust and control the flow rate freely, and because most of them are fixed by threaded connections The thread is very easy to get stuck when used for a long time in a more complex outdoor environment, resulting in the problem of being unusable

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