Wafer Style, Jorlon Diaphragm The Mark 575 Series wafer style sliding gate back pressure regulator is designed to regulate upstream pressure to a predetermined setpoint, utilizing a spring-loaded mechanism that holds the sliding gate seats in their normally closed position. This innovative wafer-style design significantly reduces weight compared to traditional flanged valves while providing exceptional performance through Jordan Valve's sliding gate technology. This spring loaded back pressure valve is available in sizes from 3" to 6" (DN80 to DN150) with flow capacities up to 400 Cv (345 Kv), the Mark 575 delivers accurate pressure control across setpoint ranges from 4 to 30 psi (0.28 to 2.07 bar). The spring loaded back pressure valve features the highly durable Jorlon diaphragm, tested to over 1,000,000 full stroke cycles without failure, and optional Jorcote ceramic seat coating that maintains Class IV shutoff even after extensive use in demanding steam applications up to 550°F (288°C). Its straight-through flow design operates 5-10 dB quieter than conventional globe-style regulators while providing superior rangeability up to 20:1. The self-contained design requires no external sensing lines, and the sliding gate seats can be easily removed without special tools, making the Mark 575 an ideal choice for applications requiring reliable back pressure control with minimal maintenance requirements across steam, gas, and liquid services.