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An image featuring a storage tank farm equipped with breather valves and other tank protection equipment. The array of storage tanks, surrounded by pipelines, showcases the implementation of safety measures such as breather valves to regulate pressure and protect against overpressure or vacuum conditions in the tanks

Vacuum Relief Valves

Vacuum Relief Valve

Vacuum Relief Valve (VRV):


A Vacuum Relief Valve (VRV) is an essential safety device used in various industrial applications to protect storage tanks and vessels from potential vacuum conditions. These valves are designed to automatically open and release excess vacuum to prevent any potential damage to the tank, ensuring the safety and integrity of the stored contents.

Corsair Valve Services - Your Trusted Source for Vacuum Relief Valves:


At Corsair Valve Services, we take pride in offering a comprehensive selection of Vacuum Relief Valves (VRVs) to meet diverse industrial needs. Our VRVs are available in various designs and configurations, providing exceptional versatility to suit different applications. We partner with multiple manufacturers to ensure that our customers have access to the most suitable and high-quality Vacuum Relief Valves for their specific needs.

Key Features:

  • Top or Side Mounted: Our Vacuum Relief Valves (VRVs) are designed to be versatile and can be either top or side mounted, providing flexible installation options.

  • Weight Loaded VRVs: With weight loaded VRVs, you can rely on standard vacuum settings from -2 mbarg to -60 mbarg, ensuring effective vacuum relief.

  • Spring-Loaded VRVs: Our spring-loaded VRVs come with standard vacuum settings from -70 mbarg to -700 mbarg, meeting diverse vacuum management needs.

  • Optimised Weight Packages: The VRVs include weight packages uniformly shaped to aid even weight distribution on the pallet, enhancing the sealing effectiveness of the valve.

  • Size Range: Accommodating various tank sizes, our VRVs are available in sizes ranging from 2" (DN50 mm) to 12" (DN300 mm), offering comprehensive solutions for different tank configurations.

  • Diverse Body Materials: Choose from a range of body materials, including Aluminium, Carbon steel, Stainless steel, and Polypropylene, ensuring compatibility with a wide range of substances and environments.

  • Multiple Trim Materials: The trim materials we offer include Stainless steel, Hastelloy, and Polypropylene, ensuring reliable performance and compatibility with various substances.

  • High-Quality Diaphragms: Our VRVs feature a wide selection of high-quality diaphragms crafted from various materials, such as FEP, carefully chosen to match the content of your tanks. These diaphragms excel in sealing capability, ensuring longevity and unparalleled reliability.

  • Removable Seats with Self-Draining Design: Our VRVs are equipped with removable seats featuring a self-draining design, preventing freezing in harsh conditions and ensuring continuous valve operation.

  • Tailored Connections: Connections can be tailored to match your tank specifications, typically following ANSI/DIN/API standards, ensuring seamless integration into your setup.

  • Custom Solutions: For specialized requirements such as steam jacketed or Derakane coated applications, we offer custom solutions. Feel free to consult us for more information tailored to your unique needs.

Choose Corsair Valve Services for top-quality Vacuum Relief Valves, backed by expert advice and exceptional customer service. Safeguard your operations with reliable tank protection solutions from Corsair Valve Services


Corsair Valve Services also specialises in the maintenance and calibration of breather valves from all brands, adhering to API 2000 and ISO 28300 standards, which also includes conducting a leak test. Other service providers may lack the necessary equipment for conducting leakage tests, leading to critical omissions during servicing. In addition, insufficient knowledge of industry standards such as API 2000, ISO 28300, and EEMUA 231 can result in inadequate servicing and testing. Therefore, when selecting a service provider to maintain your breather valves, it is crucial to ensure that they possess the appropriate expertise, equipmemt and adhere to industry standards in their service and testing procedures.

"How do they work ?"

Pressure and Vacuum Relief Valves, commonly known as Low Pressure and Vacuum Relief Vents, Breather Valves, Conservation Vents, or Tank Vents, serve a crucial role in safeguarding atmospheric storage tanks. They are specifically engineered to prevent over pressurisation or excessive vacuum conditions, as well as minimise the evaporation of tank contents into the atmosphere.

The need for pressure and vacuum relief arises in various situations, including:

  1. Displacement: When an atmospheric storage tank is being filled or emptied.

  2. Thermal events: Occurrences related to temperature changes.

  3. Fire conditions: Protecting the tank during fire incidents.

  4. Other events: Instances such as equipment failure that can impact tank pressure or vacuum levels.

These valves play a vital role in maintaining the integrity and safety of storage tanks by regulating pressure and vacuum levels in a controlled manner

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