Question 6025 of 398 · Ohio Pesticide Applicator Core Exam

Why do backpack sprayers with hand pumps often have a constant-flow valve or pressure regulator?

Exactly one answer is correct.

AThe pump cannot build any pressure at all without a regulator
BIt makes the tank agitate itself while the operator is spraying
CWithout one, pressure and rate vary as the operator keeps pumping
DIt is required by federal law on every hand-pumped sprayer sold

Show solution

Correct answer to question 6025

C: Without one, pressure and rate vary as the operator keeps pumping

Explanation

Output of a nozzle changes with pressure, and hand-pumped pressure rises and falls. A regulator keeps pressure, droplet size, and rate steady.