Double Block and Bleed Ball Valve (DBB Ball Valve)

Double Block and Bleed Ball Valve (DBB Ball Valve) introduction
Double Block and Bleed Ball Valve (DBB Ball Valve), DBB ball valve have two balls and one or two needle valves,the two ball valves can opend and closed the medium and two needle valves can discharge pressure of the valves,Double Block and Bleed Ball Valve (DBB Ball Valve) is designed to replace the complex form of the connection of multiple valves in traditional pipes,so as to reduce leakage points in the system and realize fast discharging and closing. Double Block and Bleed Ball Valve (DBB Ball Valve) saves the installation procedures,reduces pressure in the pipe system,facilities instrument cleaning and maintenance and lowers the cost.
 
the pressure of the fluid is absorbed by the trunnion bearings and is directly transmitted to the valve body, no effecting on the seat and the seat may not bear more pressure, Double Block and Bleed Ball Valve (DBB Ball Valve) have features of less torque, least deformation on the seat, most reliable and stable sealing, long service life. Double Block and Bleed Ball Valve (DBB Ball Valve) is supported by the bearings at the up and down, eliminate the high pressure generated from the inlet crash of the fluid to the ball and the seat, minimize the friction and save the torque greatly, easy to operate. 

Double Block and Bleed Ball Valve (DBB Ball Valve) specification
Threaded units available in 6,000 & 10,000 Psig ratings
Threaded connections from ¼” through 1”
Flanged connections from ½” to 12”
Flange ratings 150# - 2500#
Wide range of materials of construction available
NPT threads standard, BSP available
PTFE packing or graphite packing

Double Block and Bleed Ball Valve (DBB Ball Valve) design feature
EEMUA 182, ASME B16.34 Design
Full Bore And Reduced Bore Design
Flanged, Welding, Hub, Threaded Ends
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

Double Block and Bleed Ball Valve (DBB Ball Valve) application
Double Block and Bleed Ball Valve (DBB Ball Valve) is mainly suitable for the instrumentation but is also required as an alternative to the in-line installation of two valves.
Thanks to a DBB ball valve, it is possible to have the same result reducing costs,  overall dimensions and the ability to bleed off the plant, by controlling a potential leakage of the plant.
Double Block and Bleed Ball Valve (DBB Ball Valve) is recommended for any pressure class and ensure long-lasting seal.
They can be supplied both in the Trunnion and in the Floating version.

Main applications in the petrochemical field:
Cryogenic service.
Low temperature.
Ambient temperature.
High temperature.
Corrosive fluids.
High pressures.
Samplings from line.
Fluids  injection.

Double Block and Bleed Ball Valve (DBB Ball Valve) structure


Our product range:
Shanghai Huixuan is ball valve factory, China Ball valve manufacturer mainly produce pneumatic ball valve,electric ball valve,floating ball valve,trunnion ball valve,segmented ball valve,high pressure ball valve,cryogenic ball valve,3 way ball valve,PTFE lined ball valve,ceramic ball valve,DBB ball valve,cast steel ball valve,stainless steel ball valve,forged steel ball valve,fully welded ball valve, top entry ball valve,italy water ball valve,direct mount ball valve,plastic ball valve and other ball valves.