How to automatically switch between the two ways of Dongying Run Feng gas regulator box
Analysis of technical scheme
1 under normal conditions, the safety cut-off valve of the first stage voltage regulator and the monitoring and regulating valve and the monitor regulator fail, and when the downstream pressure can not be controlled, the safety cutting valve will automatically cut off the gas source, and the standby loop begins to supply gas at the same time, in order to ensure the continuity and safety of the downstream pipeline and the operation. For the two stage pressure regulating part, because two different pressures are needed, two ways of supplying gas are set up. It is the form of cutting + monitoring + voltage regulation respectively.
The principle of automatic switching of 2 voltage regulating road is different. Under normal circumstances, the controller controls the regulating valve to supply gas to the downstream pipeline to ensure the pressure of the downstream supply.
At the same time, the control valve of the standby regulator is closed by the controller. Once the pressure control valve of the main pressure road is all broken down, the outlet pressure of the whole station rises to the pressure setting value of the main pressure road emergency shutoff valve, the main regulating road emergency shut-off valve is cut off; after that, the controller controls the work regulating valve of the standby voltage regulation Road to open and adjust the pressure to the downstream pipeline. At this time, the truncated valve (ball valve) before and after the main pressure regulating circuit can be closed, and the gas in the pipeline will be emptied, and the corresponding equipment of the main pressure regulating road shall be maintained.
Explanation: because of the increase of outlet pressure caused by the malfunction of the main regulator, the emergency shut-off valve will not be cut off. When the running road accident occurs, the outlet pressure is too high. When the outlet pressure reaches the cut off pressure of the running road, the reaction speed of the shut-off valve is high.