What is the minimum recommended intake pressure when using an eductor?

What is the minimum recommended intake pressure when using an eductor?

• A. 180 psi
• B. 250 psi
• C. 200 psi
• D. 300 psi

Answer: (C)

An eductor relies on the Venturi effect to pull foam concentrate into the water stream. That suction only remains reliable if the water entering the eductor has enough energy, which means a minimum intake pressure. The standard minimum to ensure consistent foam-proportioning and reliable flow is about 200 psi at the eductor inlet. If the intake pressure drops below that, the eductor may not entrain enough concentrate or the mix can become unstable. Pressures at or above 200 psi maintain the necessary velocity and suction to draw the concentrate properly, without needing unnecessarily high pressures. So the minimum recommended intake pressure is 200 psi.

An eductor relies on the Venturi effect to pull foam concentrate into the water stream. That suction only remains reliable if the water entering the eductor has enough energy, which means a minimum intake pressure. The standard minimum to ensure consistent foam-proportioning and reliable flow is about 200 psi at the eductor inlet. If the intake pressure drops below that, the eductor may not entrain enough concentrate or the mix can become unstable. Pressures at or above 200 psi maintain the necessary velocity and suction to draw the concentrate properly, without needing unnecessarily high pressures. So the minimum recommended intake pressure is 200 psi.