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slack&parr; valves, also known as speed synchronization valves, are a general term for flow divider valves, flow combiner valves, one-way flow divider valves, one-way flow combiner valves, and proportional flow divider valves in hydraulic valves. Synchronization valves are mainly applied in hydraulic systems with synchronous control of dual-cylinder and multi-cylinder configurations. There are many methods to achieve synchronous motion, but among them, the synchronous control hydraulic system using flow divider-combiner valves (synchronization valves) has many advantages such as simple structure, low cost, ease of manufacturing, and high reliability. Therefore, synchronization valves are widely used in hydraulic systems. The synchronization of flow divider-combiner valves is speed synchronization. When two oil