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Description:Specifications: 1) Size: DN100 (4")~DN800 (32") 2) Pressure: PN 16~40, 150lbs, 300lbs 3) Material: a) Body: stainless steel, carbon steel b) Sphere: stainless steel, carbon steel c) Stem: stainless steel d) Seat: PTFE + stainless steel (carbon steel) 4) Standards: a) Valve design to: GB12237-89, API6D b) Valve test to: GB/T13927-92, API598 c) Face to face: GB12221-2005, ASME/ANSI B16.10 d) Flange drilled is according to: GB9113, HG20592, ASME/ANSI B16.5 Features: 1) All diameter design: the all diameter valve has the diameter of channel completely equal to the inner diameter of pipe to facilitate to clean the pipe 2) Block and bleed function: the valve adopts spring to pre-tighten; and seat seal is double pistons; the emptying valve installed on the middle cavity is used to empty and the blow down valve installed at the bottom of valve to clear off dirt to facilitate to clean the pipe 3) For the rising of temperature, outlet of seat has automatic relief function 4) Fire-proof structure: when the fire happens to make PTFE soften to damage, the fire proof seal surface of seat supported circle can contact with ball to have seal function; this conforms to the rule of API607 Inner packing: Plastic package Outer packing: Wooden cases