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Old 18.02.2019, 14:42
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Plumbing issue for techies

We have a ground floor apartment and a large garden in a new build PPE in Lausanne area. I decided to install automatic watering for the 680 sq m lawn and borders but having bought all the parts and buried the pipework I discovered that the 3 garden water outlets have a water pressure of 16 bars(!) - way over the level possible for the Gardena watering system valves to handle (max 6 bars). I have remonstrated with the builder to no avail so am faced with paying to have a pressure reduction valve (and a non-return valve?) installed. My question is: am I right in thinking it is unreasonable to have such high pressure in a garden water outlet? It seems to be the level normally reserved for the street rather than for private households. Also do I need to fit a non return valve to protect the house system? Any advice welcome. Thank you.
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Old 18.02.2019, 15:07
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Re: Plumbing issue for techies

Why would you need a non-return valve?

Anyway, just fit a pressure reducer.

Tom
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Old 18.02.2019, 15:28
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Re: Plumbing issue for techies

There's a thread on it here which I started

I too want a permanent solution but there is physically no room to put a pressure-reducing valve (and bypass) on my mains water coming in to the house.

My stop-gap was a pressure reducing valve that I just screwed on one of the outside taps for the summer and I took it off for the winter.

I went against my own advice and bought one from Ali-Express as I could not find one locally for the pipe sizes I have.
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Old 18.02.2019, 16:26
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Re: Plumbing issue for techies

Here is a CH product you need (if you are sitting down while you look at the price).

http://shop-da.dkh.ch/product.cfm?dim=552.262&sprache=f


I will take the opportunity to say once again, this is an example of why you need legal insurance in CH. Best to have a lawyer discuss the matter with the guys who did the installation of a system that they should have known will not work give the pressure differential.
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Old 18.02.2019, 16:36
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Re: Plumbing issue for techies

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I will take the opportunity to say once again, this is an example of why you need legal insurance in CH. Best to have a lawyer discuss the matter with the guys who did the installation of a system that they should have known will not work give the pressure differential.
I read it that the OP had installed the watering system himself.
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Old 18.02.2019, 16:36
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Re: Plumbing issue for techies

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Here is a CH product you need (if you are sitting down while you look at the price).

http://shop-da.dkh.ch/product.cfm?dim=552.262&sprache=f


I will take the opportunity to say once again, this is an example of why you need legal insurance in CH. Best to have a lawyer discuss the matter with the guys who did the installation of a system that they should have known will not work give the pressure differential.
Why should OP hire a lawyer to talk with OP himself? Seems a bit like a huge waste of money besides that it would be awkward..

Hint: As you can read, OP installed the system himself.
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Old 18.02.2019, 16:46
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Re: Plumbing issue for techies

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I went against my own advice and bought one from Ali-Express as I could not find one locally for the pipe sizes I have.
I don't want to say, I told you so, but...

who am I kidding?

I TOLD YOU SO!
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Old 18.02.2019, 16:49
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Re: Plumbing issue for techies

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I read it that the OP had installed the watering system himself.
Reading TOO quickly. I associated "builder" of the house with" installer" of the watering system.

At the same time, it is still good to have legal insurance.
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Old 18.02.2019, 16:55
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Re: Plumbing issue for techies

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Reading TOO quickly. I associated "builder" of the house with" installer" of the watering system.

At the same time, it is still good to have legal insurance.
Don't knock yourself. Maybe the OP can sue himself and claim the damages from his liability insurance
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Old 18.02.2019, 16:59
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Re: Plumbing issue for techies

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Don't knock yourself. Maybe the OP's wife can sue him and claim the damages from his liability insurance
Fixed that for you.
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Old 19.02.2019, 14:46
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Re: Plumbing issue for techies

Thanks to all for the ideas. I'm still surprised that a developer would leave such high pressure supply as the only source of water for the garden hoses, sprinklers, etc. If my daughter turned the hose on full she'd probably leave the ground. The reason I mentioned the non return valve is that a plumber who quoted for installing the whole system (just under CHF9,000) said it was a legal requirement if you connect an outside pipe to the main house system, he said you have to protect the house from returning 'foul' water though it's hard to see how that might happen.
I will fit the pressure limiter as a start! Thanks again.
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Old 19.02.2019, 14:51
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Re: Plumbing issue for techies

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Why should OP hire a lawyer to talk with OP himself? Seems a bit like a huge waste of money besides that it would be awkward..

Hint: As you can read, OP installed the system himself.

Unless the OP is actually also a lawyer, then he could bill himself for talking to himself. It's all good for the GDP.
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Old 19.02.2019, 14:56
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Re: Plumbing issue for techies

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Thanks to all for the ideas. I'm still surprised that a developer would leave such high pressure supply as the only source of water for the garden hoses, sprinklers, etc. If my daughter turned the hose on full she'd probably leave the ground. The reason I mentioned the non return valve is that a plumber who quoted for installing the whole system (just under CHF9,000) said it was a legal requirement if you connect an outside pipe to the main house system, he said you have to protect the house from returning 'foul' water though it's hard to see how that might happen.
I will fit the pressure limiter as a start! Thanks again.

There are people who use the outdoor supply for purposes other than watering the garden, and may hence be happy to have decent prerssure, For example when washing the car. This is why the prerssure reducing valve is your responsibility.


I don't know what the legal situation is concerning contaminatzion but there is definitely an issue. It doesn't just have to be about actual dirty water, but a pipe that doesn't see much movement of water and can heat up in the sun (as is the case for a hose pipe) and that can potentially breed bacteria is already problematic. You thus need to have a clear flow and valve hierarchy to prevent back-flow.
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Old 19.02.2019, 16:46
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Re: Plumbing issue for techies

yes that makes sense, thanks amogles
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garden sprinklers, plumbing, water pressure, watering




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