R Series proportional relief valves are designed to protect pressure sensitive equipment by diverting flow in order to relieve pressure upstream of pressure sensitive equipment. Relief valves open when the upstream pressure exceeds the set pressure of the valve permitting flow through the valve. Flow through the relief valve increases and decreases proportionately in response to changes in upstream pressure. Proportional relief valves reseal at a pressure lower than the cracking pressure.
Set pressure is the upstream pressure at which the first indication of flow occurs. Set pressure of each valve after initial relief is repeatable within:
Resealing pressure is the upstream pressure at which there is no indication of flow. The resealing pressure is always lower than set pressure.
Valves are available cleaned in compliance with ASTM G93 Level C and CGA G-4.1, Cleaning Methods and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched Environments.
R Series proportional relief valves are used in gas or liquid systems in upstream and downstream oil & gas, chemical, pharmaceutical and laboratory application. They are often used ahead of pressure sensitive analyzers, flow meters and other pressure sensitive equipment or downstream from pumps and regulators to ensure protection from failures upstream of the relief valves or blockages downstream of the valve. Other applications include test labs, steam cleaning and sterilization systems, heating lines, dispensing and filling systems.