Stainless Steel Double Block&bleed Ball Valve
Stainless Steel Double Block&bleed Ball Valve (DBB Ball valve) is made of high-quality stainless steel, with excellent corrosion resistance and high temperature resistance, and can maintain stable performance under harsh working conditions.Double Block and Bleed functions ensure that fluids can be effectively cut off and residual media or pressure discharged when needed. Even one closure element is ineffective temporarily, the rest one can keep the stability of block.
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
Stainless steel
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: Why select Stainless steel as valve material?
A: Stainless steel has wide application in petroleum and chemical industy. 1.It can resist erosion from corrosive media such as acids, alkalis, salts and seawater, and is suitable for use in harsh environments such as those in the chemical industry and marine fields. 2.Stainless steel possesses both high toughness and compressive strength, and can withstand high pressure (10-42 MPa) and temperature fluctuations (-196℃ to 650℃), thereby extending the service life of the valve. 3.Although the initial cost is higher than that of carbon steel, the long-term maintenance cost is lower and the replacement frequency is greatly reduced.
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