Standard: API609, MSS SP-67, BS5155, EN593 Features: 1. Spring loaded on back of seat,prevent any leakage even under high corrosion. 2. PTFE liner, low friction and resitant to high corrosion. 3. Rubber back ensures flexibility and diffrent rubber for diffrent temperature range Size Range: DN50 to DN600 Pressure Rating: 10bar Flange accomodation: EN1092 PN10/PN16 or ANSI 125/150 Face to Face: EN558 Basic series 20 Body: Ductile iron, carbon steel, stainless steel Disc: PTFE, SS304, SS316, SS316L, aluminium bronze, hastelloy Seat: PTFE with NBR back, PTFE with EPDM back, PTFE with Silicon back, PTFE with VITON back negotiate