Pressure/Vacuum Relief Valve w/ Pipe-Away/Pressure & Vacuum Springs

Model 1223A is used for pressure and vacuum relief where vapors must be piped away. Escaping vapors are piped away through a flanged outlet connection. This helps to provide increased fire protection and safety. The 1223B Pressure/Vacuum Relief Valve is a spring-loaded version of the 1220A PVRV for use at pressures and vacuums of 1 PSIG and above.


  • The flanged outlet connection allows escaping vapors to be piped away, instead of released directly to the atmosphere
  • 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: 1 psig to 15 psig (68.9 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.