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Old 02-24-2015, 11:23 PM
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Default Help Understanding Water Pump Schematic

I am intrigued by this device. Any physics major able to explain the missing parts of the explanation? More specifically, what makes the water switch from the left side low pressure piston to the right side low pressure piston?

how-the-high-lifter-works-for-web-page.jpg
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Low pressure water from your water source enters the High Lifter and pushes against the Low Pressure Piston. As the Low Pressure Piston moves, water is squeezed against the High Pressure Piston. As the water is squeezed, pressure builds up in the High Pressure Cylinder. It is the difference in size between the large, Low Pressure Piston, and small High Pressure Piston which multiplies the pressure according to the principle of the Hydraulic Lever, discovered by Pascal in 1646. The pressurized water enters the Central Tube, goes through a check valve, and exits the High Lifter. It then flows up a pipe to your tank. The tank can be as high as 1000 feet above your water source.
If possible, I would like to try a DIY of this.

Source: How the High Lifter Water Pump Works
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Old 02-28-2015, 12:23 PM
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Default Re: Help Understanding Water Pump Schematic

Basically, the pump has to sit below your low pressure reservoir so that the weight of the water can act as your source of energy. the weight of the water pushes a piston with large surface area, which creates a considerable amount of pressure and ultimately squirts the water out through a very small tube. when the water is released, the piston will return to its original position, and the other low pressure piston will repeat the process. the pump will alternate between the two.

essentially, you are gaining the ability to pump the fluid very high distances (through pressurizing said fluid) and what you are sacrificing is floret (you will get low flow rates compared to a traditional pump)

i hope this helps.

-Charlie Q
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Old 03-02-2015, 09:36 PM
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Default Re: Help Understanding Water Pump Schematic

Thanks Charlie. This part is what I don't understand...

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Originally Posted by Charlie Q View Post
when the water is released, the piston will return to its original position, and the other low pressure piston will repeat the process. the pump will alternate between the two.
What will make the low pressure piston return to its original position so the other side cycle starts? And what prevents both sides going at the same time, or what is the alternating mechanism? Lastly, does the high pressure piston (orange) move at all?
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Old 03-03-2015, 01:16 PM
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Default Re: Help Understanding Water Pump Schematic

Ok, the way that I understand this schematic might not be 100% correct, but it is the only way that it makes physical sense to me:

1. The two low pressure pistons are fixed together by a tube.
2. The high pressure piston is fixed in the center and does not move.
3.The low pressure piston assembly moves back and forth. As it does so, the low pressure piston which is moving towards the high pressure piston is pressurizing the water and lifting it up.
4.The low pressure piston which is moving away from the high pressure piston is pushing "wastewater" out of the pump. (This is basically a pressure relief mechanism. if you didn't have a way for the water to escape, pressure would build up on the wrong side of the low pressure piston assembly and the device would not function.)
5. Since the two low pressure pistons are joined together, while pone piston is in its power stroke, the other is returning to its original position. this is how they reset.
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Old 03-11-2015, 07:36 PM
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Default Re: Help Understanding Water Pump Schematic

I ended up finding a more detailed explanation in the user manual for the pump. It reads:
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A larger piston acts with a smaller one to gain mechanical advantage, a kind of "hydraulic lever."
A collar inside the pump controls the inlet valve. As the pistons reach the end of their stroke, they contact this collar, pushing it until it directs a small amount of "pilot water" to the end of the "spool" in the valve, thereby shifting it and changing the direction of the water flow in the pump.
The flow moves the pistons in the opposite direction until they again contact the collar, which shifts the valve spool again, and the process repeats.
This is what that essential piece looks like:
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