Dbb Modular Double Block and Bleed Ball Valve

• Media: Oil
• Driving Mode: Manual
• Connection Form: Flange
• Structure: Centre Sealing
• Seal Form: Force Sealed
• Valve Stem: Normal
• Model NO.: DBB
• Work Pressure: High Pressure (10.0mpa< Pn <80.0mpa)
• Working Temperature: Low Temperature (-100°C<T<-40°C)
• Material of Seal Surface: Soft Sealed
• Valve Body: Sheet Metal
• Application: Industrial Usage, Water Industrial Usage
• Size: DN80-DN800
• Transport Package: Standard
• Specification: SS316
• Trademark: Nai-Lok
• Origin: China
• Production Capacity: 1000

Product Description

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.

 

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

 

Brand name	NAI-LOK
Type	DBB Ball Valve
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 three-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