Refrigeration Compressor, Check Valve, Refrigeration Ball Valve manufacturer / supplier in China, offering Liyongda Cast Steel Valve with Ammonia Cooling, Refrigeration Compressor, Bizer Type Compressor and so on.
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this is the video of valve test . each of valve should be tested after finished producting . the tast will last for 3 mins . no leakage .So the quality is promised .