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DBB Valve

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The Double Block and Bleed (DBB) valve has two distinct valves, typically ball valves, arranged in series with a gap between them. This configuration serves the purpose of establishing a dual barrier or isolation to effectively halt the flow of fluids in both directions. In simpler terms, when both valves are in the closed position, they effectively impede the fluid flow, while the interstitial space between them can be purged or drained of any remaining fluid. This ensures that no pressure accumulates between the valves, thereby enhancing safety and reliability.

Introduction

The Double Block and Bleed (DBB) valve has two distinct valves, typically ball valves, arranged in series with a gap between them. This configuration serves the purpose of establishing a dual barrier or isolation to effectively halt the flow of fluids in both directions. In simpler terms, when both valves are in the closed position, they effectively impede the fluid flow, while the interstitial space between them can be purged or drained of any remaining fluid. This ensures that no pressure accumulates between the valves, thereby enhancing safety and reliability.

DBB Valve (5)

Key Features

The valve’s opening and closing actions occur without any contact between the sealing surfaces of the valve body and the sliding plate. As a result, there is no friction or wear on the sealing surfaces. This design ensures a long service life for the valve. Valve maintenance is convenient as there is no need to remove the valve from the pipeline. Simply disassembling the valve bottom cover allows for easy replacement of a pair of sliding plates. The valve body and cock are designed with reduced diameter, effectively lowering costs. The inner cavity of the valve body undergoes hard chromium plating, providing a hard and smooth surface for sealing purposes. The slide incorporates an elastic seal made of fluororubber, which is molded into the groove on the surface of the slide. The elastic seal is backed by a metal-to-metal seal with fireproof functionality. An automatic relief device is optionally included with the valve. This device prevents abnormal pressure buildup in the valve chamber after complete closure and facilitates valve testing. The valve switch indicator is synchronized with the switch position, providing accurate display of the valve’s current state.

Advantages

  1. Reliable Isolation: DBB valves offer effective isolation in both the upstream and downstream directions, even under high pressure and high temperature conditions. This is crucial in situations where preventing leakage through the valve is of utmost importance to avoid significant consequences.
  2. Enhanced Safety and Maintenance: Once the fluid is isolated, the discharge mechanism of DBB valves allows for the drainage of the area between the two valves or seating surfaces. This feature is valuable for maintenance activities and integrity checks, enabling the monitoring of potential leaks.
  3. Seal Integrity Check: DBB valves allow for easy inspection of the seat seals, ensuring their integrity and reliability. This helps in identifying any potential issues or wear and tear, enabling timely maintenance or replacement.
  4. Wide Range of Applications: DBB valves find extensive use in various industries, including oil and gas, liquefied natural gas, petrochemical, transmission and storage, natural gas industrial processes, liquid pipeline systems, and refined product delivery pipelines. They are particularly suitable for liquid pipeline applications due to their through-conduit design and fully protected seating surfaces.
 
DBB Valve (5)
DBB valve(6)

Parameters Table

NameDouble Block and Bleed (DBB) Valve
MaterialA105/SS 304/SS 316/F51/F53/F55/or meet actual needs
Operating Temperature54-640℃
Feature1. Easy Operating
2. High Accuracy Long Life
3. High Efficiency Low Cost
StandardASTM, ASME B16.5
Advantages1. Improved safety, leakage is reduced by up to 60%
2. Reduced costs, installation and component costs reduced by up to 70%
3. Reduced susceptibility to problems caused by vibration

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