Trunnion Ball Valve Double Block & Bleed
Trunnion Ball Valve Double Block & Bleed apply intergral or 3-piece body and 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. This design significantly reduces potential atmospheric leakage, minimizing any hazardous risk when transferring liquids or gas–offering the highest level of safety in double isolation and bleed service.
VALVE DESIGN
API 6D, API 6A, ASME B16.34, ISO 14313, ISO 10423, ISO 17292
TEMPERATURE RANGE
-58 to 392°F (-50 to 200°C)
SIZE
NPS 1-12 (DN 25-300)
PRESSURE RATING
ASME 150 - ASME 2500
FACE-TO-FACE
As per API 6D standard
END CONNECTIONS
RF, RTJ as per B16.5 &B16.47
BW, Butt Welded as per B16.25
SW, Socket Welded as per B16.11
MATERIALS
Low Temperature and Low Alloy Carbon Steel
Stainless steel, Duplex and Super Duplex
Nickel alloys, Titanium
BODY DESIGN
Forged and casting bolted two-piece and three-piece
SEAT DESIGN
Soft or metal seated with Hard facing on ball and seats
Double piston seats
Combination seats
FEATURES
Double block and bleed design (DBB)
Secondary seals in pure Graphite
Anti-Static Device
Anti Blow out stem
Emergency sealant injection on seats and stem available
Low fugitive emission stem packing available
O-ring /Lip seals and Graphite configuration
CRA overlay on all dynamic sealing areas or on all wetted parts available
Extended bonnet for low & high temperature available
OPERATOR
Manual: Lever or Gear with padlocking
Actuated: Pneumatic/Electric
TESTING & CERTIFICATIONS
Compliance with API 6D & ISO 5208 & API 598 inspection and testing
Fire safe and fire tested as per API 607
SIL 3 Certification as per IEC61508
Fugitive Emission as per ISO15848
PED 2014/68/UE
FAQ
Q: What is the difference between Trunnion ball valve and DBB Double ball trunnion ball valve?
A:The differences are from Structure and Safety Feature.
Structure:
DBB Valve: Employs double-seat sealing with piston effect (API 6D compliant), where pressure from both sides pushes seats against the ball for enhanced reliability.
Trunnion Valve: Relies on single-seat or dual-seat designs with spring-loaded or metal seals, suitable for unidirectional or bidirectional sealing depending on the model
Safety Features:
DBB Valve:
1.Double Block: Isolates both ends simultaneously, preventing cross-contamination or leakage
2.Bleed Function: Allows safe depressurization of the valve cavity before maintenance
3.Fire-safe design: Metal seats maintain sealing even during fires
Trunnion Valve: Lacks inherent double-blocking unless specifically designed with additional DBB features
FAQ
Q: Is there a significant difference in price between the Trunnion ball valve and the DBB ball valve?
A: Yes, it is. The detailed price is based on working condition( pressure class, temperature, medium) and material selection. DBB ball valve need more metal material, so the price will be higher.
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