1. ss304 or ss316 material optional
2. 1",1.5", 2",2.5",3",4"tri clamp ends, threaded and butt weld are available
3. made by CNC machine
4. stainless steel spring with high quantity
5. Opening pressure: 4.5psi/0.3 bar (DN25/1″), 3 psi/0.2 bar (DN32/0.75″ to DN40/1.5″), 1.5 psi/0.1 bar (DN50/2″ to DN100/4″), 1bar pressure is also ok to make.