Double Block & Bleed Valves
Introduction
Reliable Isolation, Enhanced Safety
Double Block & Bleed Valves are designed to provide secure isolation for critical process applications. These valves offer two isolation points and a bleed port, ensuring zero leakage and safe maintenance operations. Ideal for oil & gas, petrochemical, power, and chemical industries.
Why Choose Our DBB Valves?
Compact and space-saving designs
Minimum leak paths for enhanced safety
Pressure-tested as per international standards
Available in various materials and bore sizes
Optional configurations: flanged, threaded, and integral assemblies
Our Range of DBB Valves
DBB Bleed Valve
Compact valve with two isolation ball/needle valves and a central bleed valve—ideal for direct mounting and small footprint applications.
Integral DBB Valve
All-in-one design combining isolation and bleed functionality in a single forged body. Reduces weight, installation time, and leak paths.
Injection Quill DBB Valve
Designed for injecting chemicals into the process line with safety isolation and backflow prevention. Suitable for high-pressure pipelines.
Monoflange Valve
Single flange-mounted solution with multiple isolation stages. Commonly used for pressure instrumentation, measurement, and sampling.
Applications
The Double Block & Bleed Valve ensures safe isolation and controlled pressure venting in high-pressure pipelines and offshore platforms, enhancing safety and operational efficiency.
Used in chemical plants for handling hazardous fluids, the Double Block & Bleed Valve provides secure isolation and safe venting, reducing the risk of leaks and contamination.
In power plants, the Double Block & Bleed Valve ensures secure isolation of steam or cooling water systems and allows safe depressurization during maintenance.
The Double Block & Bleed Valve is used in petrochemical facilities for isolating and venting pressurized fluids or gases, ensuring system integrity and worker safety.
In marine applications, the Double Block & Bleed Valve is critical for isolating and venting fluid and gas systems aboard ships, ensuring operational reliability and safety.
Custom-engineered valve solutions for industrial fluid control.
Trunnion Mounted Ball Valve
Design Features
Double Block & Bleed
Spring loaded floating seats maintain contact with the ball and provide tight shut off even at low pressure differential. Independent sealing of upstream and downstream sides facilities draining of fluid from the body cavity, and thus the double block and bleed operation.
Double Body Sealing
Spring loaded floating seats maintain contact with the ball and provide tight shut off even at low pressure differential. Independent sealing of upstream and downstream sides facilities draining of fluid from the body cavity, and thus the double block and bleed operation.
Fire Safe Design
In the event of fire, soft insert gets burnt and spring loaded seats ensure metal to metal sealing.
Multiple Stem Sealing
A triple sealing arrangement in stem area prevents leakage to atmosphere. It includes double sealing with O-ring and graphite seal at the top of stem housing. The blow out proof stem enables positive stem retention.
Technical Specifications
Within Given Tolerances By Closely Monitoring Critical Dimensions, Surface Finishes, Run Out, Sharp Edges Etc. After Referring And Meeting The Requirements As Per Drawing, Under Rigid Quality Controlled Procedures Approved To ISO 9001: 2015 Which Ensures Consistent Quality and High Performance Products.
Design & Testing Standards
- YDB Valves are designed and manufactured as per ASME B 16.34, API 6D & BS 5351/BS EN ISO 17292. These standards cover pressure – Temperature ratings, minmum shell thickness, bore diameter for each size/ class.
- Valve body and trim can be offered as per NACE MR 01-75 compliant.
- Castings inspection as per MSS-SP 53, 54, 55, 59, 93 & 94
- Actuator mounting pad on the valve as per ISO 5211
- Other applicable standards:
- Valve Bore: API 6D
- Face to Face: ASME B 16.10/API 6D
- Flange dimensions: ASME B16.5/B16.47 / MSS SP 44
- Butt weld valve ends: ASME B 16.25/B 31.3/B 31.4/B 31.8
- Pressure tests: API 6D/API 6FA/BS EN 12266-1 & 2
- Fire safe test: API 607/ API 6FA/BS 6755 Part II/ BS EN ISO 10497
- Drain / Vent/ Bypass: MSS SP 46/API 6D
