Product Description Trunnion Mounted Ball Valves Design Feature Sealing construction of valve seat Trunnion mounted ball valve has all kinds of sealing construction. Our company produce Trunnion mounted ball valve as API6D designed, according to different working condition with different sealing construction. Self-Relieving construction When an abnormal rising of pressure appear in the internal body cavity, the single sealed-structure takes on the function of automatic pressure relieving, while the double-sealed structure can finish the job through a attached pressure-reliving device to the valve body. Anti-Static Device The stem is made separately from the ball; The lower end of the stem is designed with an integral collar to be blow-out proof. Fire Safe Design. Internal Leakage Prevention When non-metal materials such as O-ring and seat are decomposed or deteriorated by fire, the edge of the metal seat preloaded by the seat spring comes contact with ball to shut off the line fluid to minimize internal leakage through the valve bore. Product Specification/Models Technical Data Size:NPS2~60 ,DN50~1500 Pressure Ratings:Class150~1500,PN16~100 Body Materials :ASTM: WCB(A105) ,CF8(304),CF3(304L),CF8M(316),CF3M(316L) D I N:GS-C25(St50-2),1.4308/1.4301,(1.4306),1.4408(1.4401),(1.4404) Design Standard:DIN3356,API 6D,ASME B16.34 Face to Face:DIN EN 558,ASME B16.10 Flanged Ends:DIN EN 1092,ASME B16.5 Test and Inspection:ISO5208, DIN3230,API 6D,API598 Fire-safe Design :ISO 10497,API 607, API 6FA Notes: The sizes of serial valve flange dimension can be designed according to customer's requirement.