Product Details:
Payment & Shipping Terms:
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Port Size: | 2"~36" | Pressure Rating: | 300LB~2500Lb |
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Operation: | Manual, Pneumatic, Electric, Hydraulic | Structure: | 2PCS, 3PCS |
Structuer: | Double BLock & Bleed | Applications: | Petroleum & Gas |
High Light: | flanged end ball valve,v port ball valve |
High Pressure DBB Trunnion Ball Anti-static CE Flanged Ball Valve
DOUBLE BALL/PLUG DB&B VALVES
With the need for verifiable and maintainable shut off in safety critical applications, double block and bleed valves have commonly been used for primary and secondary tight shut off, in an attempt to provide and ensure system integrity. Historically, system integrity would be achieved through the use of two individual isolation valves, a spool piece and a bleed valve that had the disadvantage of extensive cost and weight and also increased the risk of emissions due to multiple flanged faces. Consequently, integral DB&B valves are now widely used.
These valves have a single or side entry body design with dual Ball or Plug valves with a bleed valve installed between the two main line valves. These valves are available bi-directional in metal seated and soft seated style, in bubble tight shut off. Sometimes called twin valves, DB&B valves are available in Plug and Trunnion Ball type up to 600mm NB in ANSI 150 to 2500 class. These DB&B design valves replace existing traditional techniques employed by pipeline engineers to generate a double block and bleed configuration in the pipeline. There are several designs and configurations of Double Block & Bleed valves as follows
SINGLE BALL TRUNNION DB&B
Conventional single ball trunnion mounted ball valves have two energised generally bi-directional seats. The body cavity can then be fitted with a drain valve at the body cavity drain point and this type of valve is then sold as a “Double Block and Bleed Valve” (DBB). Conventional single ball design still allows a closed valve to leak up or downstream should the body cavity over pressurise. However double piston effect (DPE) seats can be specified on single ball DB&B trunnion valves. This style of valve is classified under API6D as a ‘Double Isolation and Bleed valve’ (DIB). This design ensures that both seats are always sealing, even if one seat does fail, the other seat will continue to maintain a seal as the two way seats maintain a bi-directional seal. With DPE seats, a body cavity external pressure relief valve is fitted (which can be optionally by-passed back to the upstream flange of the valve or to flare). This is a cheaper option than twin ball DB&B valves whilst still providing a high level of integrity.
SPECIFICATIONS:
Full Bore Design
Bolt Bonnet Split Body
Three Piece Body
Trunnion Mounted Ball Valve
Blow out proof stem
Anti-static Spring
Fire Safe construction
Size:2"-32"
Pressure:150-2500lb
Material:A105,LF2,F304,F316,F316L,F304L,Alloy steel
OPERATORS
● Level
● Gearbox Operated
● Electric Actuators
● Pneumatic Actuators
Contact Person: sales
Tel: +8613660157288
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