Plate and heat exchangers are important tools in lots of industries. They help move heat between two liquids or gases, so processes become more efficient. For example they use in power plants to cool steam, in food processing for pasteurized milk, and in car engines to stop overheating. Shanghai Changlong make high-quality plate heat exchangers that fit needs of different companies. These devices works by thin plates stacked together, letting heat pass from one fluid to other without mixing. This way they save energy and keep everything running smooth