Hydrophore sets

Hydrophore sets ZHA, ZHB, ZHF

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Hydraulic accumulator sets built as parallel systems of several pumps are designed for pumping water, raising water pressure in supply networks, and compensation of hydraulic losses resulting from the parameters of supplied pipelines. The pumping sets are designed to supply potable water and/or treated utility water without solid sediments at a temperature below 40oC (ZHA.0 - ZHB.3), 90oC, or(ZHA.4 - ZHA.7, ZHF). Maximum operating pressure of the set: 10 bar.

Main applications:

  • water supply systems;
  • water treatment stations;
  • pumping stations for individual multi-storey residential buildings or groups of them;
  • pumping stations in public buildings (hotels, schools, hospitals, etc.);
  • fire water supply for hydrant and standpipe systems;
  • industrial water systems (cooling and process water);
  • irrigation systems.


  • Capacity: 3,6 ÷ 480 m3/h
  • Delivery head: 10 ÷ 100 m
  • Pumped liquid temperature: max 70oC
  • Working pressure: 10 [bar]


The hydraulic accumulator sets are systems of several pumps that usually have the same size and which are connected in parallel to the supply and delivery manifolds by non-return and cut-off fittings. The set pumps are installed on a support structure made of steel sections. The support structure features vibration dampers that allow setting the set directly on floors

Pumping units: The ZH hydraulic accumulator sets are equipped only with pumping sets manufactured by Hydro-Vacuum S.A.

Support structure: It is a welded structure made of steel sections set on vibration dampers with height adjustment in the range of 20 mm and a levelling system.

Manifolds: The manifolds combine the individual pumps in the set on the supply/suction and delivery ends. They are made of welded pipes and standard flange connections. One side of each manifold is ended by suitable metal and rubber flange caps. The manifolds have connector pipes for measurement equipment and protective devices (pressure transducers, pressure gauges, pressure controls, LCA pressure switches, etc.). The manifold layout and diameter can be customised on request.

Fittings: Every unit in the ZH set is equipped with cut-off fitting on the supply/suction and delivery ends to isolate individual pumps without interrupting the operation of the whole set. The delivery side of each pump features a non-return valve.

Design version of the set

Due to the necessary adaptation to various functional and installation conditions, the hydraulic accumulator sets are available in a wide range of design versions specified by a four-character code.

The vertical frames are designed for free orientation of the control cabinet. The control cabinet vertical frame has an individual secondary frame.

Features of the microprocessor controller used in standard ZHA set control systems:

  • Pump speed control depending on the delivery manifold pressure (in an FC system, h = 1). The control system maintains a constant pressure or its specified values in a defined interval by switching various pumps on and off, and adjusting the RPM of the pump that is currently connected to the frequency converter.
  • Switching the pumping unit on and off depending on the delivery manifold pressure (in a cascade system, h = 2). The control system maintains a constant pressure or its specified values in a defined interval by switching various pumps on and off.
  • Starting of successive pumping units in the set (by a frequency converter or directly from the mains, or optionally by a thyristor soft starter).
  • Pump running time balancing: equalisation of the usage rate and test running of pumps in a set that provides fire water supply (all identical pumps of the set). In this function the first pump to be started is the pump with the shortest running time or with the longest standstill.
  • It also prevents starting of more than one pump at the same time. It is possible to set a time delay after which the next pump in the set will start.
  • Stopping and switching the set to standby in periods of zero demand.
  • Stopping of pumps at programmed permissible pressure setpoints.
  • Adjustment of the system's performance of the supplied pipeline characteristics by discrete adjustment of pressure setting values in relation to the number of running pumps or preset measured flow rate (optional connection to a flow meter).
  • Readouts of all measured operating parameters.
  • Adjustment of parameter settings in relation to time interval settings (option).
  • The control system automatically switches to cascade operation when the frequency converter fails.
  • The control system enables switching to manual mode when the controller fails.

Features of the controller software:

  • Collection of data about the values measured in the last seven days.
  • Memory of all operating state changes of the set with precise event times (storage capacity: 1000 events).
  • Collection of data about individual pump running times.
  • Export/transmission of data packages over a serial link in an agreed format to external devices (radio modems, phone modems, GSM modems, PCs).
A hydraulic accumulator set with four OPA.5 vertical pumps, a control cabinet installed on the set top; the manifolds, support structures and pump connectors are made of acid-resistant steel; standard manifolds (flanged) adapted for four pumps. The set is delivered with the control system. Adjustment using a rolling frequency converter. Type UZS 8.07 control system with a microprocessor controller.

Specify any special requirements for optional functions of the set control system at the hydraulic accumulator set selection stage.

Control cabinet

The control system is installed in a cabinet with an IP54 enclosure. The cabinet size depends on the hydraulic accumulator set size. The cabinet sizes are listed in the set dimensioning tables. The cabinet structure is metal with powder coating. The cabinet has an independent support structure (vertical frame) that accomodates any installation orientation. One end of the structure rests on vibration dampers and the other is fixed to the support structure of the pumps.

The control cabinet front door features:
  • The controller ZZ wa front panel with the operator's control panel;
  • Operation mode selector switches for individual pumps (operation mode switching: hand/automatic);
  • Start and stop switches for individual pumps;
  • Operating status and failure alarm indicators.
  • "Power Failure" indicator;
  • "Dry run" indicator.
The side panel of the control cabinet features the main switch.

Dry run protection

The set pumps are protected as standard from dry running by conductive measurement probes installed in the main bodies of pumps (ZHA). In addition, a set that is operated with an open reservoir can feature float switches or a system of conductive measurement probes, or work with a hydrostatic probe that controls the reservoir filling. In this version the set has no pressure transducer on the supply manifold. A set operated on a water supply system has the pump dry run protection with the aforementioned conductive measurement probes and a pressure transducer on the suction/supply manifold. The available optional protection includes an LCA pressure switch installed on the suction/supply manifold of the set.

Installation site considerations:

  • The room area should enable installing the hydraulic accumulator set with clearances that enable free access to individual components.
  • The ambient temperature at the installation site should be between +5oC and + 40oC.
  • The room should feature a ventilation system with an air exchange rate of 1/hour or higher.
  • Due to the foundation of the set on vibration dampers with levelling, no extra foundation works are necessary for the installation.
  • The room floor should have a slope towards floor drains for effective water discharge from the installation site. The running hydraulic accumulator set must be protected from flooding with water.
  • If the set is fed by an open storage reservoir, the hydraulic accumulator set should be located to ensure a minimum static flow of 1.0 m at the set connection point. Otherwise contact the manufacturer to select and install a suitable flooding adapter.

Design of ZHA, ZHB and ZHF sets

Each system can have its design and control features customised to exact specifications.
1. OPA, OPB, or OPF unit
2. Supply manifold
3. Delivery manifold
4. Set frame
5. Cabinet frame
6. Vibration damper
7. Ball valve
8. Check valve
9. Control
10. Pressure transducer
11. Pressure gauge
12. Pressure tank

Hydro-Vacuum S.A. Pump Selection Progam.

Quick and simple online tool for pump selection based on set criteria.

Thanks to the PDP, by means of the "Hydraulic Selection" function, specific pumps can be selected by configuring, among other things, the area of application, pump type, pump design, medium to be pumped, operating point, etc. Alternatively, by using the "Product Catalogue", you can conveniently browse through the pump catalogue which is Hydro-Vacuum S.A. 's production offer.

The result of the selection is a data sheet for the pump containing all the necessary hydraulic (characteristics), electrical, material, construction, dimensional, etc. data.

The first thing to do is to register a new account. After entering some necessary data and approving the form, an activation link will be sent to the e-mail address provided. After clicking on the link, you will be able to make full use of the Hydro-Vacuum S.A. Pump Selection Software.

We encourage you to create an account and try our program.
Technical assistance in the operation of the program tel. 56 45 07 545 (working days 7:00-15:00)

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