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DIGUANG plate heat exchanger in refrigeration-welded plate heat exchanger design As we branding our DIGUANG brand, we are committed to being at the forefront of the industry, delivering superior capability in manufacturing products with maximized cost efficiencies. This includes our markets around the world where we continue to expand our international presence, strengthen our international partnerships and broaden our focus to one that is increasingly global.shell and tube heat exchanger manufacturers,high efficiency heat exchanger,engine heat exchanger.