Check valve Features: 1) Connection mode of valve: Thread , Butt welded, Socket welded (BW, SW). 2) Material: SS304, SS316 3) Size range: DN25-150 (1" -6" ), 4) Standards: SMS, DIN 5)Working pressure: 1000psi(6.4MPa) 7)Temperature Range: -20-300 degree C 8)Investment: casting body and cap 9)Sealing: PTFE, RPTFE, PPL 100% leakage tested at 100 psi air under water