When the pump turns on, the pressure inside the pump column changes and the valve responds by opening. Check valves and foot valves are designed to stop water from going backwards when the pump shuts off. The purpose of a check valve is to prevent process flow from reversing in the system which could damage equipment or upset the process. If the foot valve is more than about deep, the resulting vacuum will cause the water to boil away, leaving nothing in the upper part of the pipe.
If a single check or foot valve is a good thing, one would think multiple check valves would be better. Check valves are self-activating safety valves that permit gases and liquids to flow in only one direction. When the pump starts, it ll lose its prime. Unlike other valves, a foot valve is created with a larger flow area than the actual pipe size to make sure that there is less head loss. They function as a check valve, but they also have a strainer affixed to their open end.
Foot valves are a type of check valve and are placed at the pumps wet well.
A foot valve is found at the end of a pipe line in a suction lift application. Within each flow range system are an assortment of different foot valves and tubing for different sampling requirements. Air will find its way into the pipe.
Check valves are normally on the discharge side of pumps, and foot valves are on the intake of pumps. If the foot valve leaks any at all, and the check valve seals, the water in the pipe will be in a vacuum. Inertial Pump Foot Valves - Waterra Pumps INERTIAL PUMP the basics. Waterra Inertial Pumps systems are available in four (4) performance ranges: Standard Flow, High Flow, Low Flow and Micro Flow.
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