The fluid surface forcing control system applied on counter pressure casting is built based on the combined digital valve as the main flow control component.
采用组合式数字阀作为主要流量控制元件，构建差压铸造液面加压控制系统。
The general description, main points of design, technological improvements in valve body casting and test methods of the said valve are discussed.
论述球铁高压燃气闸阀的概况、设计要点、壳体浇铸工艺性的改进和试验方法。
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