Gas pressure regulating equipment gas pressure regulating station composition flow structure

The gas pressure regulating station plays a crucial role in the gas transmission and distribution system. Its primary function is to regulate and stabilize the system pressure, control the flow of gas, prevent damage to equipment downstream from the pressure regulator, and ensure that the outlet pressure remains within safe limits, avoiding both underpressure and overpressure conditions. The station typically consists of several key components: a pressure regulator, valves, a filter, a safety device, a bypass pipe, and measuring instruments. In some cases, the station also serves as a metering point, allowing for accurate measurement of gas flow while maintaining pressure control. (a) Valves To enable maintenance of the regulator and filter, and to isolate the gas supply when the regulator is not in use, valves are installed at both the inlet and outlet of the pressure regulating station. Additionally, a main valve should be placed 10 meters away from the station on the total inlet and outlet pipelines. This valve is normally open during regular operation. However, in the event of an accident or during maintenance, it can be closed to prevent the spread of the issue and to cut off the gas supply safely. (b) Filter Gas often contains impurities that can accumulate in the pressure regulator and safety valve, causing malfunctions by interfering with the proper sealing between the valve seat and core. To prevent this, a filter is installed at the inlet of the pressure regulator. Common types include filters filled with bristles or glass fibers. As gas passes through, solid particles hit a baffle and settle at the bottom, where they are periodically removed via a cleaning hole. Smaller particles and dust are trapped by the filter element, which is positioned between two metal grids. When cleaning, the top cover must be removed, and the filter element taken out. A differential pressure gauge is installed before and after the filter to monitor blockage based on pressure drop. Under normal conditions, the pressure loss across the filter should not exceed 10 kPa. If it does, the filter should be cleaned immediately. (c) Safety Valve If the regulator fails due to a ruptured diaphragm, improper shutdown, or adjustment issues, it may lose its ability to regulate pressure, leading to sudden pressure spikes that can endanger the system. Therefore, a safety valve is essential. It works in conjunction with a safety shut-off valve and a relief valve. The shut-off valve controls both upper and lower pressure limits, while the relief valve only manages the upper limit. The relief valve’s set pressure must be slightly lower than the shut-off valve’s closing pressure. During normal operation, the relief valve only opens when the regulator is unable to close properly (due to dirt buildup or wear), releasing excess gas into the atmosphere to prevent overpressure. This ensures the system remains safe and stable. (Source: Hebei Zhenxing Gas Pressure Regulator Co., Ltd.) Editor: Hardware Business Network Information Center http://news.chinawj.com.cn

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