The Control Seal DBBV has two seated surfaces (slips). When the valve is in closed position each individual seal is fully isolating, not allowing any leakage from downstream, upstream nor from the body cavity. A thermal relief vents / bleeds the body cavity when overpressure occurs so the downstream pipeline is fully isolated from upstream pressure without there being pressure balancing necessary. 

Compared to other types of DBB valves, Double Block and Bleed plug Valve has the DIB - Double Isolation and Bleed function.

The following benefits arise from using single valve solution:

Space + weight requirement reduction

Shorter drain times

One actuator instead of two

DBBV has the following characteristics:

100% TIGHT SHUT OFF, therefore zero leakage.

MECHANICALLY ENERGIZED SEALING without springs or other weak parts required to obtain sealing.

FRICTION-FREE OPENING AND CLOSING, no contact between slip seals and seating area during rotation.   

NON LUBRICATED SEALING, media specific soft seal material.

DUAL EXPANDING, proven zero leakage both up and downstream.

THE SELF-LOCKING OPERATING MECHANISM on all Control Seal valves secures the closing member from rotating due to in-line forces. As a result there is no danger of line slam or shock.   

    Standard Criteria:  ASME/ANSI/API

         Pressure Rating: 2 Mpa, 5 Mpa,  150 Class, 300 Class

Valve Size: 80 mm~600mm3”~24”

Actuator: Bevel Gear, Handwheel

Connection: Flange

Medium:  Gas,Naturalgas, Oil , Oil Vapor, Petroleum,  Water

Medium Temperature:  -46~200℃

Flowpassage Form:

Structural style:  Filler closed throughway

Bore:Full bore/Reduce bore

Application Fields: Aerospace, Electricity, General Industrial ,HVAC， Municipal， Petrochemical ，Power Station

Body Material：WCB， LCB

Plug:WCB,LCB

Design Standard : API 6D

Connection Standard : ANSI B 16.5

Test Standard :API598

Face to Face : ANSI B 16.10 
The best and the ideal device for truncated media in oil,natural gas and LPG 

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