Product Description Sealing Construction of Valve Seat The elastic double-bevel seal ring is specially applied in designing the floating ball valve to reduce friction between ball and seal ring for the reduction of operation physical force. The contact area of the seal ring against the ball is small when the medium pressure is comparably small as well, therefore the relatively higher specific pressure of sealing would be featured for ensuring the positive sealing, while the area would be correspondingly increasing when the pressure is becoming larger. In this situation the seal ring can hold thrust force from the medium without being damaged, while the positive sealing state would certainly be maintained. For the ball valve applied in low-pressure, ultra-low-pressure or vacuum operating condition, the specially-designed sealing construction of spring-loading valve seat would maintain the long-term reliable service of the valve, because the pressure from the medium applied itself could not ensure the positive sealing of the seat while the pre-tightening force would be unavoidably weakened after long-term performance. Auto-Decompressing Construction Anti-Static Device Fire Safe Design When non-metal sealing material are decomposed or deteriorated by a plant fire,the upstream line pressure pull the ball into contact with the metal seat lip beneath the soft seat to shut off the line fluid to minimize the internal leakage.Additionally, the fire safe metal seat can prevent the line pressure erosion on soft seat and minimize soft seat creep deformation. Stem anti-blow-out devices Technical Data Size:NPS1~10 ,DN50~250 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),(1.4435) 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 Butt-welding Ends: ASME B16.25 Test and Inspection:ISO5208,DIN3230, API 6D,API598 Fire-safe Design :ISO10497,API 607,API 6FA Notes: The sizes of serial valve flange and butt-welding dimensions can be designed according to customer's requirement.