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Exakta pressure retaining valves, with their compact and reliable set up, are suitable for applications where a constant back pressure is requested. When the discharge pressure is less than 2 bar, valves are strongly recommended to increase the pump accuracy while preventing gravity-induced siphon effect. 
The PSV elastomer/PTFE diaphragm ensures chemical resistance and long duration, while requiring low and easy maintenance. Back pressure valves are available in different sizes and materials (standard: AISI316L-PVDF-PVC; other on request) to comply with each and every application and meet the different international standards.