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Bell & Gossett Model 3DV: Get the benefits of three valves in one Any HVAC system consists of different types of valves that is present inside the system’s pumps and is essential for facilitating proper functioning of the machine. Bell and Gossett have brought to you one comprehensive valve, that provides you with the facilities of three different valves with their Model 3DV. This triple duty valve has three valves retrofitted inside one, including the check valve, calibrated balance valve and …