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Swing Check Valve is used to help direct flow in one direction, it is mainly used in pipeline system to prevent media backflow. The stainless steel bodies are highly corrosion resistant allowing these check valves to be used with a wide variety of fluids including, but not limited to water, oil, gas, air, light alkali's, acids, biodiesel, fuels and alcohols. Swing check valve is for horizontal use only. When fluid pushes on the stopper in the correct direction, it will "swing" open to allow flow. If flow moves in the opposite direction, it will swing shut. The check valve cannot be used in vertical applications as gravity may affect the function of the swinging motion.Product Features:1.Widely use: Pipe threads are common to common pipes and easy to replace and install. 2.Corrosion resistance: 304 stainless steel, nickel and chromium combined, corrosion resistance. 3.Hardness: 304 stainless steel is twice as hard as copper and ten times as hard as aluminum. 4.Rust - free: Even in humid environment, it still has strong oxidation resistance and does not corrode. 5.Shine as new: the surface of 304 stainless steel is silvery white and shiny as new in 10 years and 20 years. 6.High and Low Temperature Resistance: Stainless steel can withstand high temperatures as well as low temperatures. 7.Durable: It is a good choice for laying pipes in home buildings, and it is not easy to damage after long-term use.