China Stainless Steel Forged Double Bleed Double Block Ball Valve

Double Block and Bleed ball valve structure characteristics:
1. The double block and bleed valve have evolved to replace and add the process of bolting together individual valves to make the valves in one body .it saved a lot of space and material.
2. Special designs including injecting quills ,sample probes ,double block and single block, in-built check valves and seat wipers.
3. Dual isolation is necessary requirement when maintenance is taking place down stream of the first isolation valve. Cavity venting is provided by either a ball or globe OS&Y vent valve so that trapped pressure between the two isolation valves is safely vented.
4. These valves have also evolved to encompass the function of chemical injection (using a suitable quill) and sample points .In-built check valves are often integrated in these valves.
5. Fire Safe according to BS6755/API 6FA/API 607, since each sealing point is provided by a secondary fire-safe seal in graphite. Valve soft seats also are provided with secondary metal-to metal seal in case of fire.
6. Valve design can be either Trunnion or floating type ,anti blow -out stem and typically SPE seat design .Drain port is normally provide with a floating ball valve ,to be fitted with final user drain line .valve seats can be soft or metal to metal hard-faced.
Design Features:
The ball valve are designed in accordance with ISO14313,API 6D,BS 5351,GB/T 19672;
Simple structure with good sealing performance and small torque;
Full bore and reduced bore design with the minimum flow resistance (zero actually);
Emergency sealant injection;
Cavity pressure self relief;
Independent ball and stem;
Low emission packing;
Fire safe, anti-static and anti-blowout stem design;
Valve seat function DBB, DIB-1, DIB-2;
Optional extended bonnet.
Double Ball/Twin Ball and Needle Valve for Draining and Bleeding applications
Application:
Applicable Temperature: -20ºC ~ 150 ºC
Main Materials: WCB/CF8/CF8M/CF3/CF3M
Applicable Medium: Water / Oil / Gas / Causticity Medium
Pressure Rating: PN16-PN125, 150LB-2500LB
Size Range: 2" ~ 60"(DN15-DN300)

Materials:

ITEMPARTMATERIAL1BodyCF8M/CF3MCF8/CF3WCB2Ball SeatPTFE/RPTFE/PPL3Ball3163042014Body GasketPTFE5CapCF8M/CF3MCF8/CF3WCB6Stem3163042017Thrust WasherPTFE8Stem PackingPTFE9Gland Nut30410Handle201/WCB11Spring Washer30412Nut30413Handle CoverPlastic

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DESGN & MFT.API 6DENDS CONNECTIONRF*NPTPRE-TEP. RATINGANSI B16.34INSPECT & TESTAPI 598F-F DIMENSIONANSI B16.10END CONNECTIONANSI B16.5MARKINGMSS SP-25FIRE SAFE DESIGNAPI 607PAITINGBARE FINISHSPE. REQUIREMENTSN.A