Material:PVC, SUS304, SUS316, PTFE Caliber:DN10, DN15, DN25, DN32, DN40 Relief valve is installed on the outlet pipeline of metering pump. When the system pressure becomes abnormal, relief valve protects metering pump from any damages. Material:PVC, SUS304, SUS316, PTFECaliber:DN10, DN15, DN25, DN32, DN40