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I understand your balloon example, but this is a basically a Piston Pump with solid walls. The problem with the balloon example is that the pliability of the balloon walls may be able to prevent any water from being displaced up into the straw. It is not similar enough to my liking. ...

Should read... "In my example, I clearly made the Piston area smaller than the full surface area of the bottom of the container."

The Piston cannot take more space than the bottom surface of the Container. Even if the Piston WERE the bottom surface of the container, there would be an extremely small gap between the side of the Piston and the wall of the container... which is where the seal would occur. So technically...

Here is a better illustration to clarify the example... Under what circumstances will the container fall and displace the water into the upper chamber? One person told me that, as long as the surface area surrounding the Piston is larger than the area of the Piston, the container would...

rb1957. The Piston is attached to the ground. It is the container that is free to stay where it is, or fall downward onto the Piston (which would displace some of the water into the smaller vertical tube.

No no. I apologize. The small pipe is open at the top. I should also note that the small pipe can extend upwards. I am not suggesting the water expel from the container... but would stay in the container... only moved to a greater elevation in the container.

I have attached a picture of a problem I am trying to understand. Basically I have a Piston attached to the ground, and a container of water "free standing" above most of the Piston.... meaning, the container of water could collapse onto the Piston if the Physics say it will (and thus displace...

offonoff, Check out this diaphragm pump. 1 gallon per stroke. http://www.edsonintl.com/pumpstore/index.php?main_page=index&cPath=86 I just wish it were about 1/20th the price. It appears these pumps are about $700 or so a pop. Yeah... I need to get alot of work done each time my power...

I think I could work with a diaphragm pump. They seem to be much higher capacity, and I think I could adapt it to my power source.

Let's go back to this... because this is perhaps the most important factor. I need to pump 1 gallon of liquid with every stroke of the piston. Anything more would be great. Anything less than that I can compromise a little (say down to 1/2 gallon per stroke). I'm sure there are pumps that...

Apakrat, I do not want the whole pump submerged. I just want the intake to be well below the "water line". Why? Because I don't have anywhere near the same downforce on the piston as I do upforce on the piston. (I'm not gonna bother trying to explain why). The less work required to draw...

P.S. Thank you for your help thusfar. I appreciate it.

Just assume I am pumping water. Fluid was probably the wrong term. I should have said Liquid. Sorry. I see what you are saying. I have seen those type of homemade pumps while doing research. Ideally, I want something that is "fatter" and shorter instead of long and thin (like the one in...

Let me back up a second here, because my original post makes it sound like I'm trying to create a new pump. I am not. What I want already exists. I just can't seem to find it anywhere. Here is an example of what I want. http://www.fluid-flow-control.com/plunger-piston/plunger-piston.html...

Hi there, My name is Michael, and I am looking to have a fluid pump engineered for a specific application. I really don't know where to begin, as I am not familiar with this field, at all. What I am looking for is someone to look over a concept I have for a fluid pump.... look at all the...