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This product can adopt valve cage, valve sleeve or labyrinth structure of valve seat/spool assembly according to customer working conditions. The product is hardened with advanced HVOF technology, making it stable for long-term application in high-pressure erosion environments. At the same time, this product can also adopt step-in self-locking pneumatic actuator, so that the product runs smoothly in unstable high-pressure pipelines to avoid fluctuations.