Tyco Fire & Building Products has introduced its newest deluge valve, the Model DV-5. Abandoning traditional deluge valve designs that incorporate numerous internal chambers, springs, and plugs, the DV-5 features a single moving piece--a reinforced, natural rubber diaphragm. This one-piece design allows for a trouble-free way to externally reset the valve. The rubber diaphragm also eliminates rust accumulation, a major cause of valve operation failure. The result is a fully listed and approved valve for fire protection comprised only of the valve body, cover plate, and diaphragm. Tyco Fire & Building Products.