Air pressure can stop the flow in gravity feed systems.My band saw mill has a gravity feed blade coolant system.The tank is 6 feet above the discharge point.I can see air bubbles moving up the clear tubing.The flow is shut off at the end of the cut.When a new cut is started the valve is opened.You have to wait for the flow to restart.Friends and I had a cutdown Model A Ford we drove around woods roads in the 50s.If it ran out of gas we had to loosen the fuel line to get gas to flow again.My tractor ran out of gas while I was picking up branches.My gas can had a quart of gas in it.Put it in the tank.No start,sediment bowl had an air space.Loosened the bowl no flow.Sprayed starting fluid in the air intake, engine started.Air space disappeared.Still dont know why air bubbles move upward in the sawmill tubing while water is dripping on the blade.We know that air can stop the movement of fluid in baseboard heating systems.The blade lube tank has a vent in it.Windshield washer fluid is used in cold weather.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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