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One of the key products for the effective control of steam systems through the proper use of pilot-operated steam pressure regulators is the pilot-diaphragm type pressure reducing and stabilizing valve. Pressure reduction and pressure control of steam are among the key controls in a steam system. Steam pressure tends to fluctuate as the load changes and as the steam supply pressure changes. Such fluctuations in steam pressure lead to increased energy consumption, reduced efficiency, quality issues with the product, unplanned shutdowns of the system, and activation of safety valves. Using high-quality pressure relief valves to provide stable pressure control can improve the efficiency of the equipment. The Watt pilot-diaphragm steam pressure reducing valve is a combined-type pressure reducing valve; its body consists of a pilot valve and a main valve, with a connecting pipe linking the two. The pilot valve is also connected to a sensing tube located downstream of the pressure reducing valve. The pilot valve, also known as a control valve, has its steam output pressure controlled and balanced by a setting spring and the steam pressure downstream. The steam output by the pilot valve controls the degree of opening and flow capacity of the main valve. When the load changes, the pressure downstream also changes; by keeping the downstream pressure within the range of +/−0.1 bar, it is possible to control the variation in the output of the steam control valve. Whether it is a change in load or a change in upstream pressure, the PRV2000 pilot-operated pressure reducing valve provides precise pressure control, thereby ensuring the proper operation of the equipment, improving productivity, and guaranteeing product quality. The maximum one-time pressure reduction ratio of Watt’s pressure regulator is 10:1, while the flow rate adjustment ratio can reach 12:1. The pilot-operated pressure regulator is a self-contained type that does not require any external power; it is easy to install and adjust. It is also intrinsically safe and can be used in hazardous areas. Watt pilot-diaphragm pressure regulators can be widely used in various manufacturing processes where there is a high steam flow rate, significant changes in system load, or fluctuations in steam supply, and precise pressure control is required. The correct selection and determination of the diameter for pilot-diaphragm type pressure reducing and stabilizing valves, as well as steam pressure reducing valves, are key to ensuring their long-term stable operation; it is necessary to avoid making choices based solely on the diameter of the pipeline. For pilot-diaphragm steam pressure relief valves, it is necessary to select a valve with an appropriate diameter based on the upstream pressure, downstream pressure, and actual flow rate; the diameter of such valves is usually 1–2 sizes smaller than that of the steam pipes. In cases of large variations in system load, 2 or more pressure relief valves should be used in parallel to prevent the larger pressure relief valve from operating under light load for extended periods. Otherwise, it causes the pressure relief valve to wear out easily, resulting in a short service life. Most of the operational problems with pilot-diaphragm steam pressure reducers stem from water and impurities in the steam system; to ensure the long-term stable operation of the pressure reducer, it is important to install a DF200 high-efficiency steam-water separator and a 100-mesh filter upstream of the pressure reducer. For debugging and maintenance, DBF bellows globe valves and pressure gauges are installed upstream and downstream of the pressure reducing valve. The DBF bellows globe valves have the same diameter as the steam pipes; if the pressure upstream exceeds the maximum safe pressure of the equipment downstream, a safety valve should be installed downstream of the pressure reducing valve.