Ball valve

Modular double block and bleed valve

Series

DBB, BTC and BTD 

Valve design

based on API 6D or API 6A or API 6DSS and customer requirements

Temperature range
-150 to 662°F (-101 to 350°C)
Size

NPS 2-48 (DN 50-1200)
NPS 1.13/16 –16.3/4 (DN 46-425)

Pressure rating

ASME 150 - ASME 2500
API 5000-15000

Face-to-face
As per Velan standard
End connections

RF, RTJ as per B16.5 &B16.47
BW, Butt Welded as per B16.25
Hub connection
6B, 6BX as per API6A

Body design

Forged one-piece housing two balls

Seat design

Soft or metal seated with hard facing on ball and seats
Four Self relieving seats
Four Double piston seats 
Combination seats

Features

Double block and bleed design (DBB)
Secondary seals in pure Graphite
Anti-static device
Anti-blowout stem
O-ring / Lip seal configuration
Emergency sealant injection on seats and stem available
Low fugitive emission stem packing available
CRA overlay on all dynamic sealing areas or on all wetted parts available
Extended bonnet for low & high temperature available
Low pressure loss through the valve
BTC series: extremely compact valve design as per high pressure compact ball valves

Operator

Manual: wrench or gear with padlocking
Actuated: Pneumatic/ Hydraulic/Electric

Testing & certifications

Compliance with API 6D & ISO 5208 & API 598 inspection and testing
Compliance with API 6A inspection and testing 
Compliance with API 6DSS Inspection and testing
Fire safe and fire tested as per API 6FA/607 
SIL 3 Certification as per IEC61508
Fugitive Emission as per ISO15848
PED 2014/68/UE 
Available as per API 6A standard:
Product specification levels PSL 1, 2, 3, 3G, and 4
Performance requirement levels PR1, PR2
Design validation as per PR2F

Modular double block and bleed valves combine two in-line isolation valves into a single body with an additional bleed valve used to drain or vent trapped fluid between the two obturators to ensure highest level of safety in double isolation and bleed service. Using a double block and bleed valve versus two separate valves saves weight and space on the piping layout and ensures a significant reduction of potential leakage to the atmosphere, minimizing any hazardous risk when transferring liquids or gas. Several unique features are available to offer advanced technical solutions suitable to deal with aggressive and severe offshore environments. Material selection is fully customizable to meet customers project specifications.