Valve/Material for Siphoning Air & Blocking Water

In summary, a ball that floats against a seat and so blocks the upward flow of water only can be used to divert water away from the end of a tube used for siphoning if the valve/material is located at the end of the tube. TEMISH is a dust and waterproof Fluoroplastic Porous Film that will allow air to pass. However, it does not allow water vapour to pass with the other gasses.
  • #1
SAG93
1
0
Hello,
I wonder if anyone knows of a valve or material that would allow air to pass both ways but prevent water to pass one way.
It will be on the end of a tube used for siphoning so that air can be blown in and suctioned out but if water is collected it is diverted away from the end of the tube by the valve/material into a separate bucket. There would need to be an arm off the tube at the point of the valve/material to redirect the liquid down.
 
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  • #2
Welcome to PF.
There are valves for anything you might need. https://en.wikipedia.org/wiki/List_of_valves
Automatic valves are commonly used to drain water from the bottom of a compressed air system, or to vent air from a high point in an otherwise closed pressurised water system.

Consider a ball that floats against a seat and so blocks the upward flow of water only.
Also consider keeping the outlet of the siphon below the surface of an outlet reservoir.

You have not identified at which end of your system the valve can be located. Is the internal pressure there above or below atmospheric pressure? Maybe a diagram would help. Drag and drop it into your post.
 
  • #3
The amazing TEMISH sheet allows air to pass through, but not water. Stick it on a cup containing water, and water will not spill even if you turn the cup upside down.
 
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  • #4
@Elsa Black. Welcome to PF.
Thanks for the suggestion.

TEMISH™ is a dust and waterproof Fluoroplastic Porous Film that will allow air to pass.
https://www.nitto.com/au/en/products/group/temish/
It appears to be available as small stick on filters that protect high technology from the environment.
But does it allow water vapour to pass with the other gasses?

Gore-Tex is a similar PTFE material that can repel liquid water while allowing water vapor to pass.
https://en.wikipedia.org/wiki/Gore-Tex

The problem with these fabrics is that they can rapidly be blocked by material such as algae.
Unlike mechanical valves, they can only support a low rate of flow.
 
  • #5
Elsa Black said:
The amazing TEMISH sheet allows air to pass through, but not water. Stick it on a cup containing water, and water will not spill even if you turn the cup upside down.

That does sound unique. But it doesn't say how fast the air passes through. The OP has a siphon entrained with an air bubble. Let's say that the air bubble builds up in the pipe at rate of 1 cm3 per minute. The pressure difference inside the pipe and out is slight. Roughly how much surface area of TEMISH would be needed to do that job?
 
  • #6
On second thought, the high point in a siphon likely operates at negative gauge pressure. Wouldn't the TEMISH let air in rather than out?
 

1. What is a valve used for in siphoning air and blocking water?

A valve is a device used to control the flow of fluids, such as air and water, in a system. In the context of siphoning air and blocking water, a valve is used to regulate the direction and amount of air and water flowing through a pipe or hose.

2. What are the different types of valves commonly used for siphoning air and blocking water?

There are several types of valves that can be used for siphoning air and blocking water, including ball valves, gate valves, check valves, and butterfly valves. Each type has its own unique design and function, but they all serve the purpose of controlling the flow of fluids in a system.

3. What materials are commonly used to make valves for siphoning air and blocking water?

Valves for siphoning air and blocking water are typically made from a variety of materials, such as plastic, brass, stainless steel, and bronze. The material used will depend on the specific application and the properties required for the valve to function effectively.

4. How do valves for siphoning air and blocking water work?

Valves for siphoning air and blocking water work by using a mechanism, such as a ball, disc, or gate, to open or close a passageway in a pipe or hose. When the valve is opened, air or water can flow through the passageway, and when the valve is closed, it blocks the flow of air or water.

5. What factors should be considered when selecting a valve for siphoning air and blocking water?

When selecting a valve for siphoning air and blocking water, it is important to consider factors such as the type of fluid being transported, the pressure and temperature of the system, the size and flow rate required, and the compatibility of the valve material with the fluid. It is also important to ensure that the valve is properly installed and maintained for optimal performance.

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