Suitable for air quality to ISO 8573.1 Class 4: dirt, water and oil High flow - up to 9.90 Cv Working pressure up to 174 psi / 12 bar Suitable for low and high pressure applications PR pneumatic proportional pressure relief valves vent to atmosphere, are direct acting and suitable for low pressure applications PR Optimised force balance design - PED certified CPR pneumatic precision high flow captive pressure relief valves are designed to discharge excess pressure which builds up inside a system. Protecting the system components from exposure to excessive pressures Up to 2" process relief valve options