单点压力表开关的结构示意图如图1所示。在复位弹簧4的作用下,滑阀3处于图示位置。滑阀台肩I 将P 口和A 口分开。A 口与O 口相通。当按动按钮5时,台肩I 向左移动,此时A 口与P 口通,压力表即显示系统压力。手离开按钮5后,在复位弹簧4的作用下,随阀3自动复位,P 口与A 口断开。这种开关的图形符号如图2所示。 Single-point pressure gauge switch structure diagram shown in Figure 1. Under the action of the return spring 4, the slide valve 3 is in the position shown. Sliding valve shoulder I will P port and A port separately. A port and O port connected. When the push button 5, the shoulder I move to the left, this time A port and P port, the pressure gauge that shows the system pressure. After the hand leaves the button 5, under the action of the return spring 4, the valve 3 automatically resets and the P port is disconnected from the A port. Graphical symbols for this switch are shown in Figure 2.