Technical Specifications / Parameters Parameter Specification Model Fisher DMA (and variants like DMA, DMAD, DMAF) Type Direct-Operated, Spring-Loaded, Diaphragm Actuated Size & Connections Sizes: 3/4", 1", 1-1/4", 1-1/2", 2" (NPT) Other: Flanged connections available on specific models. Body Materials Cast Iron (standard), Aluminum, Bronze. Internal Materials Stainless Steel (spring & critical parts), Buna-N, Nylon (diaphragm & seals). Inlet Pressure Range (P1) Up to 125 psig (8.6 bar) for standard models. Outlet Pressure Range (P2) Common Spring Ranges: Adjustable from 3.5" w.c. to 20 psig (0.87 mbar to 1.38 bar). Specific springs cover portions of this overall range. Temperature Range -20°F to 150°F (-29°C to 66°C) - standard diaphragm and elastomers. Flow Capacity (Cv) Example: 1" DMA has a Cv of approximately 30. (Varies by size and model). Internal Relief Capacity Provided on most models. Capacity varies with model and set pressure. Leakage Class ANSI FCI 70-2 Class IV (Metal-to-metal seat) or Class VI (Soft seat, on specific models).
