描述
With its extra-low pressure setting, the 554 is a one-way 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. A lower-cost variant of the 553, the 554 utilizes PVC internal components to provide precise positive pressure control in an enclosure with clean air or nitrogen purge. The 554 valve is used in the oil industry to maintain positive pressure in processing control cabinets.