What is a key feature of most screw-on intake pressure relief valves?

A key feature of most screw-on intake pressure relief valves is that they have bleeder valves to vent air. This function is essential because it helps to eliminate trapped air from the system, allowing for efficient operation and preventing malfunctions that could occur from air pockets. Proper venting prevents potential airlock situations that may hinder the flow of water, which is crucial in maintaining the reliability and effectiveness of water supply systems.

While other features may be present in different types of valves, the presence of bleeder valves specifically addresses the need for proper air management in screw-on intake pressure relief valves. This characteristic contributes significantly to the overall functionality and safety of the water supply system, ensuring that pressure is maintained within safe limits and that the system operates smoothly.