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Chemline Plastics introduces the ES Series Spring Check Valves. The new valves feature a PTFE-covered stainless-steel spring for positive closing, as well as a new disc design for smooth, trouble-free operation. Compared to ball check valves, the ES Series requires very low liquid head pressure to close. That means more flexibility as to where valves may be placed in a piping system. Features include high corrosion resistance, smooth trouble-free operation, and easy installation and maintenance.