Pros: Provides the ability to mix types of media (Selector Valve). Pros: Provides the ability to divert the flow of media (Diverter Valve). Cons: More expensive than 2-way valves.

Valves generally work in one of two ways: either a solid internal part rotates to open or block the flow of water, or a stem with a washer or seal squeezes down to stop water flow.

Depending on the methods ball valve manufacturers use to determine their published rated flow capacities, the resulting value may be different, even for virtually identical valves. Rated flow capacity ...

Compressible fluid flow through control valves will inevitably cause some form of flow-induced vibration in the fluid system. Identifying the type and cause of the vibration requires detective work.

The combination permits flow to be adjusted in one direction, with free flow upon reverse. This type of two-valve combination is typically called an adjustable restrictor valve.