Valves are used to control water flow as either a shut off or to reduce flow.
Ball Valve: A Ball Valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. It is open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.
Single Union Ball Valve : This type of ball valve is the most common type of valve used in the Pool and Spa industry since it is a low cost valve that can be cemented on one side of the fitting but allows the ability to uncouple the other side of the valve with a union coupling.
True Union or Double Union Valve allows the flexibility of the valve to be uncoupled on either side of the valve using union couplings . This valve is the most common valve used in industrial applications since devices on either side of the valve can be removed. It also allows a valve to be removed or replaced for service.