All owners of surface pumping stations with a hydraulic accumulator sooner or later face a problem when air leaves the receiver and the station starts to work incorrectly. Usually, a signal of such a breakdown is the intermittent operation of the station, with frequent switching on and off of the pump.
In the figure below you can see how the accumulator works. If all the air escapes behind the membrane, the water pressure will stretch the membrane, filling the entire inner space with water. Because of this, the relay will not work properly, so we need to pump air again!
But some types of master perform even this simplest procedure incorrectly: I even once observed such, and it was funny! :) On an example of recent work, I will show you how to do it right. And you won't have to call any masters!
If the access to the pumping station is free, then it can be serviced on the spot, and if the station is, for example, in my case, in a narrow well, then you have to get it! To do this, unscrew the two nuts of the detachable connections - at the inlet and outlet.
We take out the station, behind the receiver there is a plastic plug that protects the air valve (spool) from contamination.
We unscrew it counterclockwise. First you need to check if the membrane has broken: for this, you need to press on the valve with some thin pin. If water flows out of it, then the membrane is damaged, and it will have to be changed, but more on that another time!
If the station is serviced on site, then it is necessary to ensure the flow of water. To do this, open any tap - the main thing is that you see it. Well, or you need to do it with one more person. If you got the station, then put it near the water drain, in the yard or bath.
Now we take a regular pump - if there is a compressor, then it's generally good. We connect it to the valve at the station and start pumping, while water starts flowing from the outlet of the station or tap. We swing until the water runs out.
If you have a pressure gauge, then continue pumping up to 1.2-1.5 atm. If there is no pressure gauge, then when using a regular pump, make another 20 strokes, then disconnect the hose and tighten the plug.
Close the tap or reinstall the station. In the event that you took out the station, connect the nut to the inlet and tighten it, leaving the outlet nut untightened. If the station was serviced on site, then you need to unscrew the nut at the outlet.
Now we pour water into the pump, through the outlet, until we fill it completely. We tighten the nut and now you can turn on the station.
After doing all the manipulations presented above, the station will start operating in normal mode. As you can see, there is nothing difficult about this, almost every adult can do it! That's all for me: I hope it was useful! :)