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DIGUANG double wall plate heat exchanger-plate heat exchanger boiler Our DIGUANG brand core is based on one main pillar - Striving for Excellence. We are proud of our very powerful organization and our highly capable and motivated workforce – people who take responsibility, take calculated risks and make bold decisions. We rely on the willingness of individuals to learn and grow professionally. Only then can we achieve sustainable success.industrial heat exchanger manufacturer,plate and frame heat exchanger selection,gas heat exchanger.