A. Soft or metal sealing. B. DN 50 to DN1000. C. ANSI class 150 to class 2500. D. Temperature from -257 centigrade to 537 centigrade. E. Face-to-face dimension acc. To API 594. F. Wafer, tilting, lug and double flanged types. G. Cast steel, stainless steel, all alloy material for body, Stainless steel, . Inconel for spring and EPDM, Buna-N, Viton-B, metal for sealing.