Latching device and gas transmission station pressure regulation safety cut-off valve

Abstract

The invention relates to a latching device and a gas transmission station pressure regulation safety cut-off valve. The gas transmission station pressure regulation safety cut-off valve comprises the latching device, a pressure sensor, an MCU, an electromagnet and a gate valve body, wherein the pressure sensor is connected with the MCU; the MCU is electrically connected with the electromagnet; a control end of the electromagnet is connected with an ejector rod; the gate valve body is connected with a valve rod; and when pressure measured by the pressure sensor exceeds a threshold valve, the MCU sends out an electric signal, the electromagnet is energized, the electromagnet drives the ejector rod, the valve rod falls off, and the gate valve body is cut off. According to the latching device and the gas transmission station pressure regulation safety cut-off valve, when abnormities like overpressure and pressure loss of downstream pressure are detected, the safety cut-off valve can be quickly cut off; when emergency switching-off is executed, driving is carried out through the electromagnet, and the general service life reaches millions of times; besides, the electromagnet is energized, and the situation that an interlock driving device performs mistaken action is avoided; and the shock resistance is high, closing performance is good, and real-time feedback of the valve state can be achieved.

Description

technical field [0001] The invention relates to petroleum and natural gas equipment, in particular to a locking device and a pressure regulating safety cut-off valve for a gas transmission station. Background technique [0002] At present, natural gas transmission stations mainly use pressure regulating skids to adjust the gas transmission pressure and flow rate to ensure safe production downstream. The pressure regulating skid adopts SSV (emergency shut-off valve), PCV (monitoring pressure regulating valve) and PV (working pressure regulating valve) in series to form a pressure control system. Under normal circumstances, the safety cut-off valve and the monitoring pressure regulating valve are in the fully open position, and the downstream pressure is controlled by the working regulating valve; when the working regulating valve fails and the downstream pressure cannot be controlled, the monitoring pressure regulating valve starts to work to maintain the downstream pressure ...

AI Technical Summary

Problems solved by technology

[0004] 1. Because the solenoid valve in the existing interlocking drive device is prone to internal leakage after more than ten switching tests, even under the condition of dirty air, the internal leakage will occur even after switching once, causing the SSV valve to be closed by mistake. When the solenoid valve is found In the case of internal leakage, only the valve at the root of the gas path can be closed, but the pressure regulating branch loses the ESD cut-off function, and there are certain safety hazards. It cannot be cut off immediately in case of sudden leakage or fire in the gas transmission station. lead to secondary disasters

[0005] 2. The existing interlocking drive device senses the downstream pressure by a spring sensor, and the interlocking drive is cut off when the pressure is over or under pressure. Due to the long-term use of the spring, it is easy to deform and age, resulting in inaccurate detection of pressure, which is lacking in the long run. reliability

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