Abstract : a new sequencing valve o f with structure of open in usual and compound has been introduced with principl es , characteristics and application in control circuit of increasing speed cylind ers of hydraulic press 文摘:介紹了一種新型順序閥? ?常開式和復合式順序閥的結構、原理、特點及其在液壓機增速缸增速控制回路中的應用。