附件24.3 7-9 In a two stages speed conversion circuit achieved by two speed regulation valves shown in the figure. why is the open rea of the front speed regulation valve larger then that of the aterspeed regulation valve?If three stages feed speed conversion is to be achieved without adding any speed regulation valve,what improvement can be made based upon the present circuit? 子8 为 用 中 Problem 7-9 7-10 Ina lock circuit shown in the figure,why should we use a directional control valve with Hor Y type neutral configuration?If we use a valve with M type neutral configuration,what problems may occur? ☒ 山 Problem 7-10 7-11 For the sequence control circuit shown in the figure,can the sequence contro valve3 be replaced by an outside control type?Illustrate it with a chart. 附件 24.3 7-9 In a two stages speed conversion circuit achieved by two speed regulation valves shown in the figure, why is the open area of the front speed regulation valve larger then that of the later speed regulation valve? If three stages feed speed conversion is to be achieved without adding any speed regulation valve, what improvement can be made based upon the present circuit? Problem 7-9 7-10 In a lock circuit shown in the figure, why should we use a directional control valve with H or Y type neutral configuration? If we use a valve with M type neutral configuration, what problems may occur? Problem 7-10 7-11 For the sequence control circuit shown in the figure, can the sequence control valve 3 be replaced by an outside control type? Illustrate it with a chart