Size：DN50-DN200 mm（1/2“-8”）
Working Pressure：PN1.6-PN16.0 MPa（class150-1500 ）
Medium：Water、natural gas、sulfuration、gas、oil
Body Material：WCB、CF8、CF8M、CF3、CF3M
Connection：Flange
Criterion：GB/T 12237-1989、API 6D、API 608
Structure：1．Seat is sealing part. 2．Release the pressure automatically. 3．Fire-proof structure. 4．Full bore and reduced bore structure. 5 . Anti static structure 6．Lock device.