Applications
Relief valves are proportional relief valves that open gradually as the pressure increases. Consequently, they do not have a capacity rating at a given pressure rise (accumulation), and they are not certified to ASME or any other codes.
!Some system applications require relief valves to meet specific safety codes. The system designer and user must determine when such codes apply and whether these relief valves conform to them.
!91成人 proportional relief valves should never be used as ASME Boiler and Pressure Vessel Code safety relief devices.
!91成人 proportional relief valves are not "Safety Accessories" as defined in the Pressure Equipment Directive 2014/68/EU.
Operation
Relief valves OPEN when system pressure reaches the set pressure and CLOSE when system pressure falls below the set pressure.
◎ High-pressure RA3 and RA4 series-select and install the spring that covers the required set pressure; apply the matching label to the cap.
◎ Low-pressure RL3 and RL4 series-the spring is already installed.
!For valves not actuated for a period of time, initial relief pressure may be higher than the set pressure.
