What type of pump is classified as a positive displacement pump?

Prepare for the Oregon Agriculture Herbicide Exam. Study with flashcards and multiple-choice questions, complete with hints and explanations. Boost your confidence and pass with ease!

A gear pump is classified as a positive displacement pump because it moves fluid by trapping a fixed amount of it between the gears and then forcing that trapped volume into the discharge pipe. This design allows for a consistent flow rate regardless of the pressure in the discharge line, which is a characteristic feature of positive displacement pumps. As the gears rotate, they create a vacuum that draws fluid into the pump chamber, and the subsequent rotation pushes the fluid out. This mechanism contrasts with other pump types, which may rely on fluid dynamics and are more susceptible to changes in pressure. This positive displacement action is vital in applications requiring precise fluid delivery and can handle a wide range of viscosities effectively.

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