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Pop-off Pressure Relief

Features
  • HV Compatible
  • Pressure relief @ 10 PSIG (±15%)
  • 10CFR851 compliant
  • ISO 9000 Compliant
  • Leak tight to 2 x 10-8 std. cc/sec of Helium
  • 316 Stainless steel body, spring & stem with Viton sealed seat
  • Temperature range -20ºC to 150ºC
  • Compact design brushing with 1/2" FPT connection
  • Reseats once pressure is relieved


Description
Pop-off Pressure Relief
MDC's pop-off bushing is designed as low cost pressure safety device to protect vacuum systems against over-pressurization during back-fill or from an accidental increase in pressure due to a system malfunction. The Pop-off pressure relief features stainless steel constructed body, spring and stem with Viton seat. They are designed for use in HV applications.

Application
Most vacuum vessels are designed and constructed with internal vacuum joints and welds that are rated for an external load of one atmosphere. They are not pressure vessels and as such should not be subjected to positive pressure loads in excess of one atmosphere. For this purpose MDC has developed our new line pop-off relief bushings to prevent the accidental pressurizing of a vacuum vessel. MDC pop-off pressure relief bushings are offered with NPT connections. They can be easily fitted to any vacuum system where over pressurization is a concern. MDC's pop-off pressure relief bushings have been engineered as a low cost solution for relieving vacuum system pressure. They can be adapted easily via a 1/2" NPT connection. As pressure inside a vacuum vessel reaches 10 PSIG the spring loaded stem raises allowing pressure to escape relieving pressure. Once over-pressure is reduced below 10 PSIG the spring loaded stem will reseat itself restoring the vacuum vessel to an operational condition.

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