QINUX Gun

[More Amps]

Try following my suggestion.

 

[George Erasmus]

My dad made something similar by using a few copper fittings and reducing 20mm hose to 4mm we used it to flush and clean the pool paper filter.
Good pressure increase but not enough to strip moss from bricks unless you have a lot of time + willing to spend a fortune in water.
Like mentioned before these chinese will sell you any crap how do you get your money back because 3 months after you bought it the company disappeared and popped up as a new brand.
Total snakeoil

 

[Onoff]

What about the Venturi effect? Doesn't that introduce air into the mix and increase the speed of the water whilst reducing the pressure?

 

[badabec]

Above supply pressure ?

Yes. Fountains in old stately homes did not need pumps. They had a large pond or lake built on a nearby hill. Large bore pipe from the pond, gradually reducing in diameter until it reached the fountain.
The reducing diameter increased the pressure, enough to create a good fountain.

 

[Misterg]

With apologies to any Chemists, Physicians or Mathematicians, Boyles Law says (Pressure [1] x Volume [1]) divided by Temperature [1] = (Pressure [2] x Volume [2]) divided by Temperature [2]

This effectively says that you can't change the pressure, volume or temperature in the initial state without a corresponding change in the second state...i.e if you're going to increase the pressure coming out of your hose you have to change either the volume or temperature...hope that makes sense, it's been far too many years! So, reducing the volume coming out (by sticking your finger over the end of the hose will reduce the volume passing and hence increase the pressure)

Sorry, but all that applies to “ideal” GASSES only.

It definitely DOES NOT apply to water.

 

[Morris]

Yes. Fountains in old stately homes did not need pumps. They had a large pond or lake built on a nearby hill. Large bore pipe from the pond, gradually reducing in diameter until it reached the fountain.
The reducing diameter increased the pressure, enough to create a good fountain.

Pressure is depth x density, pipe size is irrelevant. What does change in that situation is the flow velocity.

 

[Maker]

More than a little worrying that 42% of people have no understanding of the basic principle of Boyle's law...

You mean Bernoulli's principle, essentially conservation of energy.

 

[pedrobedro]

Little pieces of cabbage
and carrot in salad cream

Don't forget the chopped onion mate, gotta have the extra onion for kick

 

[More Amps]

My apologies to all the learned physicists on the forum! I have never claimed a superior knowledge of fluid dynamics, but clearly far too many years have passed since I was last daydreaming in a classroom and not paying attention to the laws and principles of Boyle, Bernoulli, Pascal et al... (however the basic premise remains true - i.e. reducing the size of the aperture at the exit will increase pressure as the volume reduces)

 

[Morris]

My apologies to all the learned physicists on the forum! I have never claimed a superior knowledge of fluid dynamics, but clearly far too many years have passed since I was last daydreaming in a classroom and not paying attention to the laws and principles of Boyle, Bernoulli, Pascal et al... (however the basic premise remains true - i.e. reducing the size of the aperture at the exit will increase velocity as the volume reduces)

 

[More Amps]

Told you I never completed my PhD...