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气动比液压对能源消耗、环境污染、防漏措施及实现生产过程中自动化,可将发挥更大的作用。而目前现有自动控制回路中的脚踏阀,不论手动或机动结构,一般静止状态P腔接气源,O腔接排气孔,当按动信号装置时,则气路P—→A腔接通,信号装置复回,靠弹簧复位,气路P与A腔切断。A—→O排空,这种脚踏阀不能与延时换向阀连接使用。为了提高自动控制的作用,现将时间控制换向阀与脚踏阀结构原理及其并联回路分述如下。时间控制换向阀结构,如图1所示。
Pneumatic than hydraulic pressure on energy consumption, environmental pollution, leak prevention measures and to achieve automation in the production process, will play a greater role. At present, the pedal valve in the existing automatic control circuit, whether in manual or motorized structure, is normally connected to a stationary P-chamber gas source and the O-chamber is connected to a gas outlet. When the signal device is pressed, the gas path P → A chamber Connected, the signal device complex back, by spring reset, gas circuit P and A cavity cut off. A- → O emptying, this pedal valve can not be used with the delay valve. In order to improve the role of automatic control, now the time control valve and foot valve structure principle and its parallel circuit are described below. Time control valve structure, shown in Figure 1.