Working principle of the differential steam pressure switch: by examining the steam pressure difference between the two different points to work. When the pressure difference between two points reaches a preset threshold, the switch will operate, and its working principle is based on the change of the pressure difference, focusing on the relative change of the pressure at different positions. Absolute type steam pressure switch: to a specific point in a steam system on the basis of the absolute pressure value. When the steam pressure at that point reaches or exceeds the pre-set pressure value, the switch triggers the action, focusing only on the actual pressure value at a certain point, and does not involve a comparison with other points.
Trigger condition differential steam pressure switch: only when the pressure difference between the two testing point to achieve the set differential value will trigger. For example, in the steam transmission pipeline, when the pressure difference between the inlet and the outlet exceeds a certain value, it may mean that the pipeline is blocked and other problems, and the differential steam pressure switch will operate at this time. Absolute type steam pressure switch: as long as the testing point of the steam pressure reached or surpassed the absolute pressure threshold will trigger. For example, in a steam boiler, when the steam pressure in the boiler
reaches the set upper limit value, the absolute steam pressure switch will be triggered to prevent the boiler pressure from being too high. Application scenario for differential steam pressure switch to monitor any blockage or leakage: by comparing the pipeline the pressure difference between the different positions, to discover the presence of blockage or leakage of the pipeline. For example, in the steam transmission pipeline in chemical production, a differential steam pressure switch can be installed to monitor the condition of the pipeline. Control the steam flow balance: in some branch of multiple steam system, can use differential steam pressure switch to adjust the pressure difference of each branch, ensure the balance of steam flow distribution. Absolute type steam pressure switch equipment safety protection: in the boiler, steam sterilizer equipment, used to set the safety pressure limit, when the stress reaches the value, the trigger protection mechanisms, in time to prevent the equipment risk due to overpressure. Accurate pressure control: requires precise control of the steam pressure in the process, such as certain precision electronic components production process, the absolute type steam pressure switch can ensure a steady steam pressure near the set point, ensure the quality of products.
Accuracy and stability of differential steam pressure switch: its precision mainly depends on two testing point pressure and the pressure difference measurement precision of the detection sensitivity. In some complex steam systems, due to pressure fluctuations and other factors, it may have a certain impact on its accuracy and stability, but it is sensitive to the change of pressure difference. Absolute type steam pressure switch: usually has high accuracy and stability, as long as the testing point pressure measurement accurate, the trigger action is relatively stable and reliable. However, in some systems with large pressure fluctuations, it may be necessary to set an appropriate lag link to prevent frequent switch action.
