What are the types of valves commonly found in water systems?

The correct answer includes gate, globe, pressure-relief, air-and-vacuum relief, and butterfly valves, all of which are commonly utilized in water distribution systems.

Gate valves are essential for fully stopping or allowing the flow of water, making them ideal for on/off control and suitable for use in a service line. Globe valves are often used for regulating flow, providing greater control than gate valves, particularly in applications where precise adjustments are necessary.

Pressure-relief valves are crucial for protecting the system from overpressure conditions, allowing excess pressure to escape as needed, which helps prevent damage to pipes and other infrastructure. Air-and-vacuum relief valves are designed to allow air to enter or exit the system, which is vital for maintaining proper pressure.

Butterfly valves offer a balance of cost-effectiveness and efficiency and are typically engaged in larger pipe systems where space-saving designs are advantageous. Their quick operation makes them suitable for various applications in distribution systems.

While other options include types of valves not as commonly found in all water systems, such as pinch and diaphragm valves, the specific collection of valves in the correct answer most accurately represents the standard choices in typical water distribution infrastructure.