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Working Principles of Pressure Reducing Valves<\/h2>\n\n\n\n
Pressure reducing valves commonly utilized in fire protection systems are primarily categorized into two distinct types: pilot-operated valves and proportional valves.<\/p>\n\n\n\n
Pilot-Operated Valves<\/h3>\n\n\n\n
Pilot-operated valves function based on hydraulic control principles. By modulating the internal throttling area of the valve, they alter the water flow velocity and fluid kinetic energy within the pipeline. This induces a controlled pressure drop in the water flow to achieve the desired pressure reduction and stabilization effects within the network.<\/p>\n\n\n\n
During operation, precise regulation ensures a dynamic equilibrium between the pressure fluctuations within the valve body and the opposing spring force. This mechanism enables the valve to maintain the downstream (outlet) pressure stably within a permissible tolerance range. It continuously reduces the high-pressure medium entering the valve to a preset outlet pressure range by harnessing the intrinsic energy of the water flow itself.<\/p>\n\n\n\n
Proportional Valves<\/h3>\n\n\n\n
Conversely, proportional pressure reducing valves employ a pressure reduction mechanism based on a fixed pressure ratio. Common inlet-to-outlet pressure ratios include specifications such as 2:1 or 3:1.<\/p>\n\n\n\n
Unlike constant-pressure valves, the downstream pressure of a proportional valve does not remain constant but rather fluctuates synchronously with the upstream (inlet) pressure. When the upstream pressure rises, the downstream pressure increases proportionally, making this type of valve particularly suitable for specific fire protection network scenarios.<\/p>\n\n\n
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Configuration and Installation Requirements for Pressure Reducing Valves<\/h2>\n\n\n\n
Within fire protection water supply networks, pressure reducing valves must be positioned and installed in strict compliance with engineering standards. For more information on system layouts, you can explore our Products<\/a> solutions.<\/p>\n\n\n\n Here are the critical installation guidelines:<\/p>\n\n\n\n Pressure reducing valves possess an inherent unidirectional flow characteristic, meaning the direction of water flow cannot be reversed. If an adjustable valve is installed in reverse, it will lose its pressure-reducing functionality and serve merely as a check valve.<\/p>\n\n\n\n Control valves must be positioned upstream and downstream to facilitate rapid isolation during maintenance. Furthermore, a pressure test drain valve must be installed on the outlet side, accompanied by a flow detection test port.<\/p>\n\n\n\n When installing proportional valves (which utilize a cylindrical piston-type spool structure), they are most suitable for vertical installation. This ensures the sealing surface of the spool is subjected to uniform force, extending its service life.<\/p>\n\n\n Upon completion of the installation, rigorous system commissioning must be conducted. Both the static and dynamic pressure parameters upstream and downstream of the valve must strictly comply with international safety specifications<\/a>.<\/p>\n\n\n\n Under test conditions involving flow rates exceeding the nominal rating (specifically 150% of the design flow), the dynamic pressure downstream must not drop below 65% of the nominal design working pressure. Throughout the entire commissioning process, the equipment must not exhibit any significant increase in noise levels across low flow, nominal design flow, and maximum flow scenarios. <\/p>\n\n\n During the routine operation and maintenance phase, a mechanism for periodic inspection is vital for the safety of the water network.<\/p>\n\n\n\n A drainage test should be conducted on the pressure reducing valve assembly on a monthly basis. This must be accompanied by the simultaneous monitoring and recording of pressure readings both upstream and downstream.<\/p>\n\n\n\n Additionally, a comprehensive performance test must be conducted annually. This test should focus primarily on assessing the flow rate and pressure stability, identifying potential equipment hazards, and guaranteeing the valve’s long-term compliance with regulatory standards.<\/p>\n\n\n\n Ensuring the safety of your water infrastructure starts with high-quality components. At XVS Valve, we specialize in manufacturing and exporting premium ductile iron valves that meet rigorous international standards.<\/p>\n\n\n\n\n
Flow Direction and Valve Structure<\/h3>\n\n\n\n
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Pressure-Reducing Valve Commissioning Requirements<\/h2>\n\n\n\n
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Maintenance and Management of Pressure Reducing Valves<\/h2>\n\n\n\n
Partner with a Trusted Valve Manufacturer<\/h2>\n\n\n\n