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 gas flow, and prevent damage to equipment caused by excessive pressure or blockage after the pressure regulator. It also safeguards the system from potential hazards due to excessively low or high outlet pressure. The gas pressure regulating station typically consists of several key components: a pressure regulator, valves, a filter, safety devices, a bypass pipe, and measuring instruments. Some stations are equipped with metering equipment, allowing them to serve both as pressure regulators and flow meters. (a) Valves To facilitate maintenance of the regulator and filter, and to isolate the gas supply when the regulator is not in use, valves must be installed at the inlet and outlet of the pressure regulating station. Additionally, valves should be placed 10 meters away from the station on the main inlet and outlet pipes. These valves are usually open during normal operation. In case of an emergency, they can be closed to prevent the spread of issues. During maintenance, these valves should also be shut off to ensure safe working conditions. (b) Filter Gas often contains various impurities that can accumulate in the pressure regulator and safety valve, leading to poor performance and reduced efficiency. To prevent this, a filter is installed at the inlet of the pressure regulator. Common types of filters used include those filled with bristles or glass fibers. As gas passes through, solid particles hit a baffle and settle at the bottom of the filter, where they are periodically removed through a cleaning port. Smaller particles and dust are trapped on the filter element, which is positioned between two metal grids. When cleaning, the upper cover is removed, and the filter element is taken out. A differential pressure gauge is installed before and after the filter to monitor pressure drop, which should not exceed 10 kPa under normal conditions. If the pressure drop becomes too high, the filter should be cleaned immediately. (c) Safety Valve In the event of a malfunction, such as a torn regulator diaphragm or improper shutdown, the pressure regulator may fail to maintain stable pressure, leading to sudden pressure surges that can endanger the system. To address this, a safety valve is essential. The safety shut-off valve controls both upper and lower pressure limits, while the safety relief valve only manages the upper limit. The release pressure of the relief valve must be set below the closing pressure of the shut-off valve. During normal operation, gas is released only when the system needs to shut down (due to dirt buildup, wear, or other issues), and it is vented into the atmosphere. This prevents excessive outlet pressure and ensures the system remains safe. (Source: Hebei Zhenxing Gas Pressure Regulator Co., Ltd.) Editor: Hardware Business Network Information Center Http://news.chinawj.com.cn

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