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Muffler valve Use and performance characteristics Silent Check Valve mainly applicable to water supply, drainage system, fire fighting pipe systems, agricultural irrigation systems. This valve installation and pump outlet to prevent backflow and the media have a devastating water, pumps and pipelines to protect other equipment. The mainstarting valve performance characteristics are as follows: Valve internal flow path with streamlined design and low head loss; Valve valve stroke is short, to achieve rapid closure of the valve, and the running balance, no vibration, no noise, safety, very few failures; Reasonable structure, good sealing performance; Wear-resistant, long life; The main form, connecting dimensions and structural dimensions DN Flange DiameterDBolt hole center circle diameterD1Connecting protrusion diameterD2Flange thicknessBOverall heightHHolesnAperturedmm1.0Mpa 1.6Mpa 1.0Mpa 1.6MPa 1.0Mpa 1.6Mpa 1.0Mpa 1.6Mpa 1.0Mpa 16Mpa 1.0Mpa 1.0Mpa1.6Mpa50 2 160 160 125 125 100 100 20 20 122 4-Φ184-Φ1865 180 180 145 145 120 120 20 20 152 4-Φ184-Φ1880 3 195 195 160 160 135 135 20 20 185 8-Φ188-Φ18100 4 215 215 180 180 155 155 22 22 185 8-Φ188-Φ18125 5 245 245 210 210 185 185 22 24 258 8-Φ188-Φ18150 5 280 280 240 240 210 210 24 26 270 8-Φ238-Φ23200 8 335 335 295 295 265 265 24 28 300 8-Φ2312-Φ23250 10 390 405 350 355 320 320 26 30 340 12-Φ2312-Φ23300 12 455 460 400 410 370 370 30 32 360 12-Φ2312-Φ23 Uses of check valve: Check valves are best suited for moderate velocity applications. They are often part of common household items. They work automatically. They do not have any valve handle or stem. They are self-activating safety valves. They permit gases and liquids to flow in only one direction. They prevent liquid flow from reversing. They are used in many fluid systems like in chemical and power plants, and in many other industrial processes. They are capable of mixing multiple gases into one gas stream. Check valves are installed in irrigation sprinklers and drip irrigation emitters to keep the lines from draining when the system is shut off.