What are DBB sampling or injection valves?

DBB (Double Block and Bleed) Sampling & Injection Probes are engineered for precise fluid sampling and controlled injection directly into pipelines, without interrupting your process. These valves are designed with two sealing points and a bleed port, ensuring maximum safety, zero leakage, and reliable operation.

​

 

​

​

​

​

​

​

​

​​

​

​

​

​

Key Features

• Double Block and Bleed Design – Prevents leaks and ensures safe operation. Also available in SBB and single block configurations

• Integrated Probes – Customizable to pipeline diameter and process requirements

• Tailored Probe Length – Optimized for flow conditions, accuracy, and performance

• High Reliability – Suitable for high-pressure, high-temperature, and corrosive applications DBB Sampling & Injection
  
  Probes are widely used in:

• Oil & Gas

• Chemical & Petrochemical Industries

• Water & Wastewater Treatment
   

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​​

​

​

​

​

​

 

Why Choose Our Probes?

• Safe and accurate sampling or injection

• Minimized downtime for continuous processes

• Custom engineering support, including Wake Frequency calculations to ensure optimal probe, probe length and long-term performance

• Available in many configurations and designs such as DBB, SBB and single block. Also available as compact monoflange valve with Needle configuration.
   

Ensure precision, safety, and efficiency in your operations with our DBB Sampling & Injection Probes.

​

​

​

​

​

​

​

​

​

​

​

​

​

​​​

​​

​

​

​

​

​

​

​

​

​

​

​

​

​

DBB Sample Probes with Wake Frequency Calculation

In high-pressure and high-velocity process lines, a standard sample probe is not always sufficient. Vibrations caused by fluid flow can lead to fatigue, inaccurate sampling, or even probe failure. For these applications, DBB (Double Block & Bleed) sample probes with wake frequency calculations provide a safe and reliable solution.

​

What is Wake Frequency?

When a fluid flows past a probe inserted into a pipeline, vortices are formed downstream of the probe. These vortices generate alternating forces on the probe shaft. This phenomenon is known as vortex shedding and results in a specific vibration frequency, commonly referred to as the wake frequency.

If the wake frequency approaches the natural frequency of the probe, resonance may occur. Resonance can cause excessive vibration, which may lead to:

• Mechanical fatigue of the probe

• Damage to the pipeline connection

• Reduced measurement accuracy

• In extreme cases, probe failure

For this reason, wake frequency analysis is essential for long insertion sample probes used in high-velocity gas or liquid applications.

​