Technical Core
| Feature | Details |
| Operation | Direct-operated, vacuum-to-open |
| Control Pressure | 1 inch w.c. to 7 psig (2.5 mbar to 0.48 bar) vacuum |
| Body Sizes | 3/4 or 1 NPT |
| Maximum Inlet Pressure | 13.8 bar (200 psig) |
| Temperature Range | -29 to 66°C (-20 to 150°F) |
| Materials | Cast iron, Steel, or Stainless Steel body |
Key Advantages
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Precision Control: By using a large diaphragm area relative to the orifice size, the T205VB can respond to minute changes in vacuum (as low as 1 inch of water column). This sensitivity is vital for thin-walled tanks that cannot withstand significant pressure differentials.
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Fleet Standardization: Because it shares many internal components (diaphragms, springs, and orifices) with the rest of the T205 series, plants can significantly reduce their spare parts inventory and simplify maintenance training.
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Tamper-Resistant Adjustment: The adjustment screw is protected by a cap, preventing unauthorized or accidental changes to the vacuum setpoint—a critical safety feature in high-traffic industrial areas.
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Easy Conversion: The design allows the unit to be changed between different pressure ranges or even converted to a pressure-reducing regulator (like the T205B) by swapping a few internal components, providing excellent asset flexibility.
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Corrosion Resistance: For aggressive environments, the T205VB is available in full stainless steel construction, ensuring long-term reliability against atmospheric corrosion and process vapors.
Applications and Industry Sectors
The T205VB is specifically suited for low-capacity vessels where mechanical vacuum relief valves might be too imprecise.
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Storage Tank Protection: Preventing tank collapse during fluid pump-out or thermal contraction (cool-down cycles).
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Process Vessels: Managing vacuum levels in reactors or mixing tanks where precise internal atmospheres are required.
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Food and Beverage: Using the stainless steel version for edible oils or beverages where cleanliness and precision are non-negotiable.
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Pharmaceutical: Protecting sensitive chemical precursors in vessels with strict pressure boundaries.
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a specialized supplier of original Fisher solutions. We provide more than just hardware; we help you verify the setpoint and relief capacity to ensure your vacuum breaker performs exactly when needed. Through our optimized supply chain, we offer the T205VB series at highly competitive prices for global industrial projects.
If you are currently calculating the required vacuum relief capacity for a storage tank based on pump-out rates and thermal contraction, please contact our technical team for a sizing consultation.
