Speciality Valve is the trusted name among Double Block And Bleed Valve Manufacturers In India offering precision engineered, safety focused valve solutions for critical isolation and pressure relief application. Our valves are designed to meet the highest industry standard, ensuring secure operation in the most demanding environment such as oil, gas, chemical and power industries. 

The Double Block and Bleed Valve (DBB) is a type of valve assembly that combines two separate isolation valve and one bleed valve into a single and compact unit. The main function is to isolate both upstream and downstream fluid flow while allowing the cavity between them to be safely vented or drained. This design ensures absolute shut off, making it essential for systems that require high pressure isolation and safety.   

Key Components of Double Block and Bleed Valve 

1. Valve Body – The pressure-containing shell that houses all internal elements. 
2. Two Isolation Valves – Typically ball or gate valves, used to block the flow from both ends. 
3. Bleed Valve – A smaller valve situated between the two isolation valves, used to vent or drain trapped media. 
4. Actuator or Handle – Manually or automatically operated, used to control valve opening/closing. 
5. Seals and End Connections – Ensure leak-tight performance and proper connection to the pipeline. 

Working Principle 

The Double block and bleed valve work by closing both isolation valve, effectively blocking the flow from the inlet and outlet. Once isolated- the bleed valve can be opened to release any trapped pressure or fluid in the center cavity. This setup provides a safe environment for maintenance, inspection or pressure testing without shutting down the entire system.   

Advantages of Double Block and Bleed Valve 

• Compact Design – Combine three valve in one body, saving space and installation time. 
• Improved Safety – Ensure complete system isolation and pressure relief. 
• Minimized Leak Paths – Fewer connections reduces the chance of leakage. 
• Low Maintenance – Fewer components means less wear and easier servicing. 
• Ideal for Hazardous Application – Perform reliably under high pressure and harsh conditions. 

Types of Double Block and Bleed Valve 

1. Integral DBB Valve – All components are housed in a single valve body. 
2. Expanded DBB Valve – Multiple valves assembled on a mounting structure. 
3. Dual DBB Valve – Constructed from two pieces, ideal for maintenance and replacement. 

Applications of Double Block and Bleed Valve 

1. Oil and gas transmission and processing 
2. Petrochemical and chemical industries 
3. Power generation plants 
4. Refineries and offshore platforms 
5. Instrumentation and metering skids 
6. Pipeline isolation and maintenance systems 

As one of the top Double Block And Bleed Valve Manufacturers In India, Speciality Valve is committed to delivering reliable, compact, and high-performance valve solutions. Our DBB valves are designed to enhance safety, ensure absolute isolation, and simplify complex pipeline systems in high-risk industrial environments. 

Description 

• Body Material: Cast iron, WCB, WCC, WC6, LCC, LCB, Titanium, SS304, SS316, CF8, CF8M, F55, F51, F53, Monel, Ductile Iron.
• Class: 150-2500, PN10 to PN450
• Size: DN15 TO DN1200
• Operations: Lever operated ball valve, electric actuated ball valve, pneumatic actuated ball valve, gear operated ball valve
• Ends: threaded, socket-weld, flanged, buttweld

Visit now:https://www.specialityvalve.com/product-category/double-block-and-bleed-ball-valve/ 

ADDRESS - 37, NGR Street, P.N Palayam, Coimbatore, Tamil Nadu