Pressure/vacuum relief valve, also known as breather valve, is used for atmospheric tanks & vessels in which solvents are filled and drawn at a high flow rate. This type of valve is installed in the in-and out-breathing lines of tanks, vessels and process equipment to retain toxic vapors and avoid atmospheric contamination, thus balancing unpredicted fluctuations in pressure & vacuum and providing increased fire protection and safety.

PERFECT is a fully stocked manufacturer and supplier of the pressure/vacuum relief valve and we provide a complete line of breather valve for sale that is supplied to commercial industries, available size is from DN25 to DN200. We also offer various pressure classes, temperatures, materials and fittings available for your different application choices and also accept the customized design. Please review the charts below for available sizes & pressure & material or fill the contact form below.

  • Protects tank from overpressure and vacuum with compact dimensions for extremely low-pressure ranges;
  • Reliable leak-tight seal performance, easy installation and mantainence;
  • Ideal for corrosion atmospheric or high product purity and quality assurance requirements;
  • Saving the cost of liquid or vapor, economical for storage of large quantity of hydrocarbon and expensive chemicals.

Pressure/vacuum relief valves design

Drive Actuation   Act-operation
Design Standard
  • API 2000
F to F Standard ASME B16.10
Testing Standard API 598
End Connection Standard ASME B16.5
Size 25 up to 200
Pressure Class Range 150 up to 900 kpa
Ends BW, RF, SW
  • Body:ASTM A216 Gr. WCB, CF8, CF8M
  • Trim/seats: Steel (Std.), AISI-SS304, AISI-SS316

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