Pressure/Vacuum Relief Valve with Vacuum Spring

The 1200 series is designed to protect your tank from damage created by overpressure or excessive vacuum. Costly product evaporation losses due to normal tank “breathing” are greatly reduced. Because the valve retains toxic vapors, atmospheric contamination is minimized. This helps to provide increased fire protection and safety. The 1202B Pressure/Vacuum Relief Valve is a spring-loaded version of the 1200A PVRV for use at vacuums of 1 PSIG and above.


  • Peripheral and central seat guides ensure reliable, repeatable performance
  • A wide seat and air-cushion seal keeps leakage low long after the valve is put in service
  • Self-draining housing body and drip rings protect seating surfaces from condensate and freezing, increasing operational reliability
  • Fluoropolymer seating diaphragms are standard to minimize sticking caused by resinous vapors and atmospheric moisture

Size: Sizes 2″ (DN50) through 12″ (DN300)

Material: Available in aluminum, carbon steel, stainless steel, fiberglass and other materials

Pressure: 0.5 osig to 15 psig (2.15 mbarg to 1.03 barg)

Vacuum: 1 psig to 12 psig (68.9 mbarg to 827 mbarg)

Certification: ATEX and PED Approval

  • 150# ANSI, PN10, PN16, JIS drilling classes available
  • Buna-N, Fluoropolymer, FKM and other seating diaphragms
  • Steam Jacket
  • Spacer

Contact your rep to start an order or learn more.