Assembly Gardena drainage valve

When it comes to the winter months, it is important to drain the irrigation system. That means it has to be winterized and the water pipeline has to be de-watered. There are two options for this. First, you can de-water the pipeline with compressed air or, secondly, use a drainage valve . Therefore plan and install it in your water pipeline. Since I do not have a compressor, I decided to use the Gardena drainage valve. Thus, I have assembly Gardena drainage valve in each irrigation strand at the lowest point of the water pipeline.

For this purpose, Gardena provides a solution consisting of the following components:

• Gardena T-piece 25 mm x 3/4″ female thread (Art.-No .: 2790-U)
• Gardena drainage valve (Art. No .: Drain Valve)

For the installation of the drainage valve at the pipe end, use the connector (item no: 2761-20).

Operation of the Gardena drainage valve

Gardena’s drain valve opens when there is no more pressure in the line. Thus, one can separate the water pipeline from the water source in late autumn and automatically opens the valve and the remaining water can escape from the line. It is therefore no time-consuming blowing out of the water pipe with air pressure. In irrigation line, a drain valve is installed. Install the valve at the lowest point of the pipeline. If the pipeline pressure drops below 0.2 bar, the water can flow out. Therefore place the valve in gravel. Install the drain valve face downwards in a gravel packing of 20 x 20 x 20 cm of wash coarse gravel (min 8 mm Ø).

To check the function of the drain valve, it can be installed in the valve shaft. For this purpose, different products are offered on the market such NDS 111BC Standard Series Round Valve Box with removable ceiling

You can find more information about my automatic garden irrigation with products from Gardena, Hunter and Homematic in my blog.

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