Author Topic: Air Release Valve for Deep Set Turbine without foot valve  (Read 155 times)

Cary Austin

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Air Release Valve for Deep Set Turbine without foot valve
« on: August 11, 2021, 11:48:03 AM »
Here are some pictures of a CSV system installed 15+ years ago for a deep set turbine pump.  There is no foot valve on the pump, as is usual with many line shaft turbines.  When working on a pressurized system using a pressure switch, getting rid of the air in the column pipe is a necessity. On this system the static water level is more than 100' deep and 100' of air in column pipe must be dispelled when the pump starts.  Using a 4" normally open valve on a tee prior to the Cycle Stop Valve lets the air escape as fast as needed.  This valve is designed to start closing as soon as water enters the pilot control valve.  A needle valve adjust the closing speed of the valve as needed.  This facilitates a smooth change from air to water in the system.  As the air release valve closes it increases back pressure until the silent check valve installed prior to the Cycle Stop Valve  slowly starts to push open. Once the air release valve is closed the Cycle Stop Valve is in control until the pump is shut off to due to no demand.