What is the difference between a solenoid valve and a pilot solenoid valve?

The direct-acting solenoid valve has a fast response speed and a short operating time. Generally, the direct-acting solenoid valve is used. The pilot-operated solenoid valve uses a small valve to open the large valve. The flow rate is large and the large-caliber valve is a pilot-operated valve. The pilot-operated type can withstand greater pressure than the direct-acting type. And the direct-acting solenoid valve has a faster startup speed than the pilot-operated solenoid valve. If you choose to use it for fast cut-off, it is recommended to purchase a direct-acting solenoid valve. Because the pilot-operated solenoid valve is energized, the small valve opens first, the main valve opens later, and the direct-acting solenoid valve opens directly from the main valve. In terms of application, the direct-acting type is mainly used for low pressure and small flow, and the pilot type is mainly used for high pressure and large flow.