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Breather Valves (Pressure & Vacuum Relief Valves)

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Pressure Vacuum Relief Valves, also known as Storage Tank Breather Valves – a critical safety devices for storage tanks in industries worldwide. A Pressure Vacuum Relief Valve plays a fundamental role in controlling the pressure and vacuum levels in a storage tank, thereby preventing the catastrophic implications of a tank over-pressurisation or vacuum collapse. Additionally, these valves prevent evaporation losses, minimise product contamination, and protect the environment from hazardous vapour emissions. The immense importance of these valves means there is no room for compromise. And that’s where our commitment to quality comes in.

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Types of Pressure Vacuum Relief Valves we Supply
  • Weight Loaded PVRV:  These vents utilise a weight to keep the valve closed. When the system pressure surpasses the weight’s opposing force, the valve opens. While less common than spring-operated vents, weight-operated vents are valuable in low-pressure applications where precision is critical.
  • Spring-Operated PVRV: Spring-operated valves rely on a spring mechanism to keep the valve closed under normal operating conditions. When the system pressure exceeds the force exerted by the spring, the valve opens to discharge the excess pressure. These vents are notable for their simplicity, cost-effectiveness, and suitability for a wide range of pressure settings.
  • Pilot Operated PVRV:  These vents use a secondary pressure (pilot) valve to control the operation of the main relief valve. When the pressure in the system exceeds the set limit, the pilot valve opens, allowing the main valve to relieve the overpressure. This type of vent is known for its accuracy and reliability, making it suitable for high-pressure applications.
  • Reliable and consistent performance is assured by peripheral and central seat guides
  • A wide seat and air-cushion seal ensure leakage is minimised, even after extended valve use
  • The valve’s body has self-draining capabilities, with drip rings to shield seating surfaces from condensation and freezing, enhancing operational dependability
  • Fluoropolymer seating diaphragms are standard to lessen stickiness from resinous vapours and atmospheric moisture
  • Full calibration documentation traceability through casting heat numbers on the body
  • Body material choices are available to cater to all applications, featuring a premium casting design to eliminate all leakage paths
  • Weight package of quality material, with full ISO 9001 traceability through the supply chain, is uniformly shaped for even distribution, with material options available for optimal compatibility
  • Superior material diaphragms, such as FEP Teflon, are used to ensure sealing capability, longevity, and reliability, with full compatibility with stored media and an ethically sourced and traceable supply chain in adherence to ISO 9001
  • Air-cushioned sealing technology is used in the seat ring, which is manufactured from durable, corrosion-resistant materials like SS 316. This ensures resistance to adverse weather conditions and maximises the lifespan
  • Fasteners are made of stainless steel for long-lasting reliability and sealing, with cross-drilled nuts for lock wiring
  • Identification includes an ISO and API-compliant nameplate featuring flow capacity, tag, serial number, and set point
  • Access to the manufacturer’s sizing program to verify vent size, with flow test results generated on an API/ISO-approved flow test rig. A full range of sizes and connections are available to meet various needs.