Which foam proportioning method involves a self-educting nozzle?

The method that involves a self-educting nozzle is the self-educating nozzle itself. This system utilizes the principle of suction to draw foam concentrate into the water stream as it flows through the nozzle. The nozzle is designed to create a Venturi effect, which allows a certain flow rate of water to mix with foam concentrate effectively.

In this method, the foam concentrate is proportional by the design of the nozzle and the flow of water, allowing for a consistent mixture without the need for additional equipment or complex machinery. This makes it a straightforward and user-friendly option for applying foam, particularly in emergency situations where rapid response is necessary.

Other methods involve more complex systems that require specific pressure settings or additional equipment to ensure foam stability and proportioning accuracy, such as pressure proportioners or balanced pressure proportioners. In contrast, the self-educting nozzle provides a simpler and more direct means of foam application.