What is the purpose of a bypass valve in a pump installation?

The purpose of a bypass valve in a pump installation is primarily to allow flow when the pump is off. When a pump is not operational, the bypass valve enables the fluid to continue moving through the system, preventing stagnation and maintaining circulation. This is particularly important in systems where continuous fluid flow is necessary to protect components, maintain temperature, or ensure that pressure is consistent throughout the network.

Bypass valves are essential in processes such as hydrant systems, fire protection systems, or heating systems where sudden shut-offs could lead to pressure variations or potential damage caused by heat or debris settling. This continuous flow helps in maintaining system integrity and performance, enabling operational flexibility and safeguarding against failures that could occur if fluid were allowed to stagnate.

The context of bypass functions also clearly delineates it from other options. Regulating flow rate and controlling pressure are functions typically managed by different types of valves or system designs. Prevention of backflow is handled by backflow preventers or check valves, which are designed specifically to stop the reverse movement of fluid, a functionality distinct from that of a bypass valve.