D-Series from Leslie Control Valves is the next generation of the reliable and proven DBOY control Valve. The D-Series is an all-purpose cage-guided, balanced control valve. This new product offers simplicity of design in a valve platform that is well suited for the needs of power, process. amd general industry. A wider selection of valve sizes, materials, and noise/cavitation, trims allows application across a broader range of flow rates, pressures and temperatures.