With its extra-low pressure setting, the 553 pressure relief valve that is primarily used to provide precise control of the positive pressure in an enclosure with clean air or nitrogen purge. The static pressure can be controlled by the adjustable nut found behind the hinging, louvered cover.
One valve is sufficient for a container with an internal volume of 866 ft3 that can withstand a pressure differential of 0.4 psig.
- Diameter: 4 in
- Housing: Aluminum
- Housing Finish: Hard Anodized
- Seals: Neoprene
- Standard Cracking Pressure: 0.40 ± 20% inH2O