Which pump type is characterized by not having an automatic pressure relief feature?

The piston pump is characterized by not having an automatic pressure relief feature. This type of pump operates by using a reciprocating piston to create pressure and move the fluid. The design of a piston pump typically allows it to generate high pressures efficiently, but it might not include built-in mechanisms for automatically relieving pressure, making it necessary for operators to manually manage pressure levels.

In contrast, other pump types, such as diaphragm pumps, gear pumps, and vane pumps, often incorporate automatic pressure relief features to prevent damage or failure due to excessive pressure. These features enhance safety and operational efficiency by regulating pressure without requiring constant oversight by the operator. Understanding these differences is crucial for selecting the appropriate pump for specific applications in pesticide application and related fields.