Working principle of direct-acting single solenoid valve

The working principle of the direct-acting single-electronic control solenoid valve

The pilot-operated solenoid reversing valve is first controlled by the electromagnet The air path generates pilot pressure, and then the pilot pressure drives the main valve spool to change direction. Suitable for occasions with larger diameter. Figure 4 shows a pilot-operated double-electronically controlled two-position four-way electromagnetic reversing valve. It consists of pilot valve (Dl, D2) and main valve. The main valve includes a valve body 1 and a piston assembly 2. What is shown in the figure is that Dl and D2 are both in a power-off state. The moving iron cores 5 and 6 of the solenoid valve are in a closed state. When D1 is powered on and D2 is powered off, the moving iron core 5 is sucked up, and the compressed air from port P enters the f cavity of the valve through hole a (dashed line). And enter the hole 'from the surrounding lips of the sealing plug 4 (one-way valve), and enter. Wide cavity, push the piston assembly 2 downward, so that P and A can communicate, and B can communicate with T through the center hole h of the valve core (exhaust). When compressed air is output from port A, a part of the compressed air flows into hole g. One of the compressed air flows into the cavity c through the throttle hole d, causing the sealing plug 4 to move down to seal the exhaust hole b. The other compressed air enters the cavity f, acting on The upper end of piston assembly 2. At this time, even if D1 is powered off, the piston assembly 2 will not be in position, that is, the valve has a memory function.