A device and method for a regulating valve to realize automatic switching and regulating of double circuits

Abstract

The invention discloses a device and method for achieving double-loop automatic switching and adjustment of an adjusting valve, and aims to overcome the problem that in the prior art the industrial control still has defects. According to the device, a control loop comprises a first two-position three-way electromagnetic valve, a valve positioning device, a converter, an adjusting valve and a second two-position three-way electromagnetic valve, wherein the inlet of the first two-position three-way electromagnetic valve is connected with a gas source; a first outlet of the first two-position three-way electromagnetic valve is connected with the inlet of the valve positioning device; a second outlet of the first two-position three-way electromagnetic valve is connected with the inlet of the converter; the outlet of the converter is connected with a first inlet of the second two-position three-way electromagnetic valve; the outlet of the valve positioning device is connected with a second inlet of the second two-position three-way electromagnetic valve; and the outlet of the second two-position three-way electromagnetic valve is connected with a pressure signal input hole of an adjusting membrane head of the adjusting valve. By adopting the device and the method, double-loop automatic switching and adjustment of the adjusting valve are achieved, and various accidents caused by faults of electric valve positioning devices and abnormity of adjusting control loops are reduced.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a device and method for a regulating valve to realize automatic switching and regulating of double circuits. Background technique [0002] With the rapid development of petrochemical, smelting and other industries, pneumatic control valves have been widely used. In the process control system, the pneumatic control valve plays an extremely critical role as the final control unit in the control system. The valve positioner uses the DCS output signal of the industrial automation control system as a given signal, and compares it with the feedback signal input by the valve stem displacement of the control valve. When there is a deviation between the two, it changes its output signal to the control valve actuator, so that The action of the actuator of the regulating valve establishes a one-to-one correspondence between the displacement signal of the regulating valve stem and the outp...

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the existing deficiencies and design defects in the field of industrial control in the prior art, and provides a regulating valve with simple structure and convenient use to realize the device and method for automatic switching and regulating of double circuits

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