Which type of valve is not typically associated with double acting pumps?

The ball valve is not typically associated with double acting pumps due to its primary function and design characteristics. Double acting pumps operate by utilizing pressure on both sides of a piston or diaphragm to create flow in both directions. This necessitates the use of specific types of valves that facilitate the controlled intake and discharge of the fluid being pumped.

Discharge and intake valves are often used in double acting pumps because they are designed to open and close in sync with the pumping action, effectively managing the flow of fluid into and out of the pump. Check valves are also relevant as they allow for the flow of fluid in one direction, preventing backflow, but are generally used in conjunction with the intake and discharge processes of the pump.

On the other hand, ball valves serve a different purpose. They are primarily used for on/off control of fluid flow and are not inherently designed for modulation in the way that intake and discharge valves are in a double acting system. Their quick action and sealing capabilities make them excellent for shut-off applications, but they do not facilitate the necessary cyclic operation required in double acting pumps. This distinct function of ball valves aligns them away from typical usage scenarios in double acting pumping operations.