Core Technical Advantages
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Rapid Stroking Speed: When the control system demands a sudden, large change in valve position, the VBL delivers a massive volume of air to the actuator. This is essential for applications like anti-surge control or emergency shutdown where fractions of a second matter.
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Integral Bypass Restriction: To prevent the valve from becoming unstable or “jumping” during small, slow signal changes, the VBL features an adjustable integral bypass. This allows the positioner to handle minor adjustments directly, ensuring smooth and steady control without unnecessary booster activation.
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Soft Seat Construction: The booster utilizes soft seats to provide a bubble-tight shutoff when the valve has reached its target position. This reduces the waste of expensive instrument air and prevents the positioner from becoming “saturated” or overwhelmed by constant air leaks.
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Preserved Steady-State Accuracy: The VBL is designed to remain idle during steady-state conditions. This means the high-speed capability is available on demand, but it does not interfere with the positioner’s ability to maintain a highly accurate, stable valve position during routine throttling.
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Fixed Deadband: The inclusion of a fixed deadband ensures that the booster only engages when there is a significant discrepancy between the input and output signals, providing a predictable and reliable performance profile.
Technical Core
| Feature | Technical Specification / Detail |
| Input-to-Output Ratio | 1:1 |
| Maximum Supply Pressure | 10.3 bar (150 psig) |
| Deadband | Fixed (to minimize positioner saturation) |
| Connections | 1/2 or 3/4 NPT (Inlet/Outlet) |
| Operating Temperature | -40 to 71°C (-40 to 160°F) |
| Housing Material | Aluminum |
| Seat Material | Nitrile or Fluorocarbon (Soft Seat) |
Applications and Industry Sectors
The VBL is typically specified for large actuators or processes requiring extremely fast movement.
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Oil and Gas: Compressor anti-surge valves that must open fully in under one second to protect the equipment.
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Power Generation: Steam turbine bypass valves and high-pressure spray water valves.
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Chemical Processing: Rapid-acting safety valves and high-cycle reactors.
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Transmission Pipelines: Large-diameter gas pressure regulators where rapid load changes occur.
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a major Fisher Valves supplier, providing a comprehensive range of Fisher solutions. We specialize in providing original, high-efficiency Emerson automation solutions to industrial clients. Beyond supplying core hardware like the VBL Volume Booster, we leverage deep technical expertise to provide professional support and model selection guidance for procurement and engineering projects. By optimizing our supply chain, we provide a distinct pricing advantage, ensuring we offer highly competitive prices while assisting clients in optimizing processes and achieving digital upgrades.
If you are currently experiencing valve oscillation or “overshooting” after installing a booster, please contact our technical team for guidance on tuning the integral bypass restriction.
