The Gardena 4700/2 automatic automatic pump makes it as easy as possible to organize country water supply if you have a shallow well (up to 8 rings).
In addition to the pump itself, nothing is needed - neither a hydraulic accumulator, nor a pressure switch, nor a check valve, nor a filter is required. You simply connect the pump to the water pipes and the pump will turn on and off by itself when you open and close the faucet. Magic!
If you ask any seller to recommend a pump for a well, you will be offered either the "Kid" vibration pump and its clones (such it is undesirable to use pumps in a well, due to the fact that vibration can lead to the formation of sinuses outside the rings and collapses soil) or a well pump (long, thin, heavy, and in most cases containing oil that can leak if cork will rust). There are almost no pumps designed specifically for wells on sale.
Many inexpensive centrifugal drainage pumps are not suitable for plumbing, as they do not provide the desired pressure (water from a hose, connected to the pump, it will pour with terrible force, but as soon as you connect it to the water supply, it will not even drip from the tap in most cases).
And yet, a centrifugal pump is ideal for a well, but it must have not one circuit, but at least two. Why they do not produce cheap double-circuit pumps has remained a mystery to me for many years.
The pump that I will talk about today is unlikely to be advised by sellers, because it is called a “rainwater tank pump” or simply a “barrel pump”. And although his instructions explicitly state that it can be used for wells with a depth of up to 7 meters, since it says "for a barrel", then everyone believes that it is suitable only for this.
The Gardena 4700/2 automatic pump can now (in May 2022) be found at a price of 10,500 rubles (in October 2021, I bought it for 7,650 rubles). It has a power of 550 W, provides a maximum output of 4700 liters per hour, a maximum pressure of 2.3 bar (lift height 23 meters), a maximum immersion depth of 7 meters. It weighs 5.9 kg.
The pump is completed with a telescopic tube with a tap for use in a barrel.
For plumbing, all this is not needed. The hose connects to the 1" outlet.
I used silicone hose 25 mm.
To connect the hose to the pump and water supply (HDPE pipe 25 mm) used metal fittings (Plastic fittings Sterwins from Leroy Merlin turned out to be of terrible quality - they screwed in with a lot of effort and leaked).
There is a removable filter on the bottom of the pump.
When turned on, the pump pumps water until the pressure in the line reaches 2.3 bar, when this happens, the pump runs for a few more seconds and turns off. The pump is switched on again when the pressure drops to 1.5 bar. Thus, the pump is "controlled" by any of the water supply taps: the tap is opened - water flows out, the pressure drops, the pump turns on, the tap is closed - the pressure rises, the pump turns off.
The pump has a tricky operation algorithm for drip irrigation and protection against line leakage: the first 60 minutes after a long shutdown, the pump can turn on and off for how long once, after 60 minutes, the pump starts counting the number of on-offs, if more than seven have occurred in 2 minutes, it is completely turned off until it is turned on again in network. This allows the use of drip irrigation systems operating up to 60 minutes and turns off the pump in case of depressurization. water supply (of course, with a large pipe breakthrough, when the line pressure never reaches 2.3 bar, the pump will not turns off).
When the tap is opened, water flows for about a second, then its pressure increases slightly (the pump turns on). The pressure is quite sufficient, even to the pump and 22 meters of pipes of different diameters (from HDPE 25 mm to metal-plastic 16 mm) and a storage water heater.
There are cheaper models Gardena 4000/2 and Gardena 4700/2 without automation. They can also be used in the well, but you will need an external pressure switch. I talked in detail about all the models and the choice of the pump last fall, when I bought the pump (article here).
Once it took me a whole day to "start" the country water supply in the spring (it was necessary to install a pumping station, connect all the hoses, fill the station with water so that it starts pumping (which did not work out the first time), then disassemble and assemble everything several times to eliminate everything leaks.
This year, thanks to the new pump, I spent less than half an hour to "start" the water supply - I lowered the pump into the well, connected the wire and hose (last year I finally made the entire plumbing permanently, ran HDPE pipes along the foundation from the outside and buried the pipe going to well).
Peace for everyone!
© 2022, Alexey Nadezhin
For twelve years I have been writing about technology, discounts, interesting places and events. Read my blog site ammo1.ru, in Learn, Zen, Mirtesen, Telegram.
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