（紧急脱离装置）能防止管路意外断裂造成的泄漏事故，适用领域包括船对岸卸载，公路、铁路的槽罐装卸以及其他固定和移动流体储存装置，比如鹤管、流体输送臂与运输载体之间的连接。 Pull-off valve (emergency release device) can prevent leaks caused by accidental rupture of pipelines. Applications include ship-to-shore unloading, tank and road loading and unloading of roads and railways, and other fixed and mobile fluid storage devices such as crane pipes and fluid transfer arms Connection to the transport carrier.
This device belongs to the weak connection point of the entire transmission link. When the set condition is reached, the pipeline is disconnected, and the intermediate medium is self-sealed in the pipeline.
The emergency release system emergency release couplings ensure the safety of fluid transportation to the greatest extent in marine and land crane pipes. With a simple and unique design, when the crane tube exceeds the rated capacity of the operating system, this system can be automatically and safely disconnected in the crane tube without any leakage. This has the advantage of ensuring triggering in the event of a danger, closing the valve instantaneously, very few drips and relatively small pressure losses. The breaking mechanism must ensure that the equipment can be automatically and quickly disengaged during "emergency disengagement"; also ensure that there is a "buffer period" before disengagement to avoid "disengagement" during normal operation and affect normal loading and unloading operations.
The pull-off valve, as the break point, should have an accurate pull-off setting force, and should not be a range value. The more common attribute of a pull-off valve is the connection point. Therefore, an unqualified pull-off valve may leak or become a bottleneck in the efficiency of the transmission pipeline.
According to the release method, there are bolt break type and rope type (ring trip technology);
From the application point of view, there are industrial pull-off valves (chemicals, petroleum derivatives), ultra-low temperature pull-off valves (industrial gases, LNG), marine pull-off valves;
In terms of structure, there are flap structure and poppet structure (also known as poppet structure)
Among them, the flap structure can solve the leakage problem caused by the unbroken single bolt and has higher safety. In addition, the smooth flow path means low flow resistance and high flow, and the energy consumption of the entire transmission system is lower.
In the large-size pull-off valve, the flap type is far less important than the poppet structure due to structural reasons. In this way, the installation on a large oil transfer arm can reduce the weight of the arm and facilitate the design and selection.
The content of the article comes from the Internet. If you have any questions, please contact us!