Ver­ti­cal hydraulic accu­mu­la­tor

A hydraulic accu­mu­la­tor or a mem­brane pres­sure tank is one of the com­po­nents of a heat­ing or hot and cold water sup­ply sys­tem. This device pro­vides unin­ter­rupt­ed water sup­ply, main­tains a con­stant pres­sure in the sys­tem and pre­vents water ham­mer that occurs in the sys­tem at the time the pump is start­ed.

The hydraulic accu­mu­la­tor is indis­pens­able in closed water sup­ply sys­tems arranged in pri­vate coun­try hous­es.

  • The device and prin­ci­ple of oper­a­tion of the accu­mu­la­tor

  • What is a hydraulic accu­mu­la­tor for?

  • How to choose a hydraulic accu­mu­la­tor

  • Installing a hydraulic accu­mu­la­tor

The device and prin­ci­ple of oper­a­tion of the accu­mu­la­tor

Hydraulic accu­mu­la­tors con­sist of the fol­low­ing main parts:

  • A met­al tank that can be of dif­fer­ent sizes.

  • An elas­tic mem­brane sep­a­rat­ing the air cav­i­ty from the water. The space between the walls of the tank and the mem­brane is filled with an inert gas.

  • Flange with which the tank is installed on the pipeline.

  • Nip­ples for pump­ing and releas­ing air from cav­i­ties.

The work­ing pres­sure of the accu­mu­la­tor is 10 atmos­pheres, and the work­ing tem­per­a­tures vary from ‑10 to +100 degrees Cel­sius.

The prin­ci­ple of oper­a­tion of the accu­mu­la­tor is as fol­lows. When water from the pipe enters the rub­ber mem­brane, the lat­ter is stretched, and the gas in the free space is com­pressed, there­by increas­ing the pres­sure on the mem­brane. Due to this, the required pres­sure is main­tained in the water sup­ply sys­tem. After the pres­sure in the mem­brane has reached a cer­tain lev­el, and the tank is filled with water, a spe­cial relay turns off the pump. When the tap is opened, water flows out of the tank, the pres­sure drops, and the pump turns on again.

What is a hydraulic accu­mu­la­tor for?

Thanks to the instal­la­tion of a hydraulic accu­mu­la­tor in the water sup­ply sys­tem, the life of the pump is extend­ed. Since there is always water in the tank, there is no need to turn on the pump every time the tap is opened. At low water flow rates, the pres­sure grad­u­al­ly decreas­es until it reach­es the thresh­old for turn­ing on the pump. Just as smooth­ly, the pres­sure ris­es when the tank is filled, reach­ing the pump shut­down thresh­old.

In this way, water ham­mer com­pen­sa­tion is ensured and dam­age and fail­ure of oth­er ele­ments of the sys­tem, in par­tic­u­lar the pipeline, is pre­vent­ed.

The larg­er the work­ing vol­ume of the pres­sure tank, the longer the pump can work with­out repair. How­ev­er, there are pit­falls here too — large hydroac­cu­mu­la­tors are quite expen­sive.

Popular Models


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Hydraulic accu­mu­la­tor mak­ing Oasis every­where GV- 8

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Hydraulic accu­mu­la­tor Dzhileks 24G, 50G

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Bat­tery tanks of Lessar sys­tems LSM-W30A150F2, W30A200F2, W30A300F2

Hydraulic accu­mu­la­tors: all mod­els

How to choose a hydraulic accu­mu­la­tor

Hor­i­zon­tal accu­mu­la­tor

Hydraulic accu­mu­la­tors for water sup­ply sys­tems are divid­ed into two types: ver­ti­cal and hor­i­zon­tal. Ver­ti­cal mod­els can be used with any type of pump, while hor­i­zon­tal mod­els can only be used with sur­face pumps.

It is worth con­sid­er­ing that air con­ges­tion peri­od­i­cal­ly forms in the accu­mu­la­tor, in order to get rid of them, the nip­ples men­tioned above are need­ed. In ver­ti­cal accu­mu­la­tors, air accu­mu­lates in the upper part, so it is quite easy to bleed it. But in hor­i­zon­tal tanks with a capac­i­ty of more than 100 liters, this is more dif­fi­cult to do, this requires addi­tion­al ele­ments — a ball valve and a drain into the sew­er. To get rid of air in hor­i­zon­tal accu­mu­la­tors of a small­er vol­ume, it is enough to com­plete­ly drain the water through the tap.

Anoth­er impor­tant para­me­ter to con­sid­er when choos­ing a hydraulic accu­mu­la­tor is the vol­ume of the tank and the per­for­mance of the accu­mu­la­tor. In order to make the right choice, you need to invite experts.

On aver­age, a tank with a capac­i­ty of 50 liters and a capac­i­ty of 2.5–3.5 m³ / hour is enough for a pri­vate house, allow­ing you to store 15–20 liters of water. How­ev­er, it all depends on the spe­cif­ic sit­u­a­tion.

Installing a hydraulic accu­mu­la­tor

When installing a pres­sure tank, the fol­low­ing require­ments must be observed:

  1. The accu­mu­la­tor must be installed on a lev­el sur­face, as close as pos­si­ble to the pres­sure switch.

  2. In order to avoid addi­tion­al hydraulic loss­es, it is nec­es­sary that the diam­e­ter of the con­nect­ing pipeline match­es the diam­e­ter of the pump dis­charge port.

  3. 2 or more mem­brane tanks can be installed in the sys­tem, but the pres­sure in the air cham­ber of each of them must be the same.

  4. Before start­ing, it is nec­es­sary to fill the sys­tem with water, open the far­thest tap and turn on the pump to remove all air.

To avoid dif­fi­cul­ties and ensure the effi­cient oper­a­tion of the water sup­ply sys­tem, the choice and instal­la­tion of a hydraulic accu­mu­la­tor should be entrust­ed to spe­cial­ists — expe­ri­enced, proven com­pa­nies who will make accu­rate cal­cu­la­tions and offer you a suit­able option, as well as mount the equip­ment with high qual­i­ty.

A hydraulic accu­mu­la­tor is an impor­tant ele­ment of the water sup­ply sys­tem, which allows not only to cre­ate a sup­ply of water, but also to ensure the nor­mal func­tion­ing and pre­vent break­downs of oth­er com­po­nents of the sys­tem. Reli­able mod­els from trust­ed man­u­fac­tur­ers will serve you for a long time and pro­vide unin­ter­rupt­ed water sup­ply.


The arti­cle was pre­pared with the help of Hog­a­rth spe­cial­ists.

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