Double Block&Bleed Valves

NSV Double Block and Bleed (DBB) valve is an integrated industrial valve assembly that provides two positive isolation barriers and a means to vent or bleed the cavity between them. This configuration enhances safety and streamlines maintenance in fluid or gas service systems.

The typical DBB valve consists of the following key components:

Block Valves: Two inline isolation valves-usually ball or gate valves-that provide primary shutoff. When both are closed, they isolate a section of the pipeline or process system.

Bleed (Vent) Valve: A smaller valve located between the two block valves, used to safely depressurize and drain any trapped media from the cavity. This ensures zero pressure and verifies isolation integrity prior to maintenance.

Key advantages of a DBB valve include:

Enhanced Safety: Dual isolation significantly reduces the risk of leakage or cross-contamination between process sections, meeting stringent safety and environmental standards.

Simplified Maintenance: The integrated bleed port allows safe verification of isolation and removal of residual pressure or hazardous media, facilitating safer and faster servicing.

Compact Design: Compared to installing separate block valves with external piping and a bleed connection, a single DBB unit saves space, reduces potential leak paths, and lowers overall weight and installation cost.

DBB valves are widely specified in critical applications across the oil & gas, petrochemical, and chemical processing industries-particularly where reliable isolation, personnel safety, and operational efficiency are paramount.

FAQ

1.Q: What's the valves warranty?
A: Our valves warranty period should be 18 months from the date of shipment or 12 months after installation, whichever occurs first.
2. Q:How can I get a quote?

A: If you request quote by preparing the product spec you want to request specifically through "Contact us or Feedback" of homepage, we will send reply to you ASAP. If the contents of homepage are not available, you can inquire to us via phone(86-577-67378616) or fax(86-577-67372367).

3. Q: I want to be registered as your agency.?

A: Defined inspection and manager's approval shall be required for being registered as the company's agency. For specific application method, please consult with sales team. If you are registered as the company's agency, "Agency Certificate" will be issued.

4. Q:Are you manufacturer or trading company?

A: We're manufacturer,but our factory name is not named NSV due to we're professional in promotion NSV brand with best service,and also have sold to many end user success.

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