Regulators – Pressure Regulator – DR Series Regulator The DR Series is comprised of pressure regulators and overflow valves. The pressure regulators are self operated valves for controlling the downstream pressure p2, applicable for liquids, steam, and gases up to 350 ° C. The valve closes when the downstream pressure rises. Our overflow valves are self operated valves for controlling the upstream pressure p1, applicable for liquids, steam, and gases up to 350 ° C. The valve opens when the upstream pressure rises. If you would like additional information, please click on any literature link below or Contact Us directly so that we may provide you with detailed specifications. Solutions Balance of Plant Boiler System Condensate Systems District Heating Level Control Main Steam System Process Control Process Heating Brands RTK Literature Pressure Reducing Valves 7501-7010 PDF Size: 369KB Pressure Reducing Valves 7537-7010 PDF Size: 254KB Pressure Reducing Valves 7601-7010 PDF Size: 319KB Pressure Reducing Valves 7637-7010 PDF Size: 250KB