• Information
  • WH
• Characteristics
  • WHA
    • WHA.2
    • WHA.3
    • WHA.4
    • WHA.5
  • WHG
    • WHG.3
    • WHG.5
  • WHI
    • WHI.5
  • WHS
    • WHS.2
    • WHS.3
    • WHS.4
    • WHS.5

The WH type, multi-stage rotodynamic pumps

The WH series pumps are centrifugal, multi-stage horizontal pumps with ring sections with closed impellers and centrifugal-centripetal stators. The WH pumps are designed for pumping clean or slightly polluted liquids (maximum content of impurities – 100 mg/dm^3o for the WHA type pumps and traces of non-abrasive particle content for the WHI, WHS and WHG) with temperatures of up to 140^oC, within the resistance range of the materials used for their construction.

Application

• Power industry – boiler feedwater, hot water, condensate,
• Industrial, pressure boosting and fire-fighting systems,
• Utility, municipal and drinking water systems,
• Distillate, solvents, fuels (including LPG) pumping stations,
• Filtration and reverse osmosis systems,
• Irrigation and snow-making systems,
• High pressure car washes.

Technical data

* Concerns selected constructions
** Concerns the WHI and WHG pumps with axial inlet

WH pump marking structure

Operation fields

Material execution

WHA/WHP pumps - general application

The WHA/WHP pumps are horizontal multistage pumps with a self-priming member, designed for pumping water at temperatures of up to 140^oC and liquid fuels and other liquids within the range of resistance of the materials used for their construction. In the WHA/WHP pumps the discharge flange is directed upwards, when the suction flange can be set as desired every 90°. The first stage of the pump is equipped with a special impeller with increased anti cavitation properties. The impellers of the WHA/WHP pumps are sealed with replaceable wear rings. The shaſt is protected with protective sleeves and sealed with gland packing or front mechanical sealing. High pressure in the discharge gland is reduced with a special pressure stuffing system, which reduces substantially the sealing load.

WHS pumps - with self-priming member

The WHS pumps are horizontal multistage pumps with a self-priming member, designed for pumping water at temperatures of up to 80^oC and liquid fuels and other liquids within the range of resistance of the materials used for their construction. The WHS pumps are the special development of the WHA pump, in which aſter the last stage an additional circulation-vacuum member was applied. The ability of self-priming is executed by the circulation member with side channels and an open impeller, which sucks gas from the inlet space of the centrifugal impeller of the last stage via unloading holes and pumps it directly to the discharge casing. This solution enables suction of the gas from the working space of the pump and the suction installation, resulting in lack of the need for application of additional priming systems. The WHS pump sucks by itself the liquid from the tank located below the pump axis, provided its previous priming.

WHI pumps - with an initial impeller with lowered NPSH

A pump of general purpose, adapted to pump a medium in temperature up to 140^oC within the resistance range of the materials used for its construction with increased suction properties (with lowered NPSH). The pump is provided with an additional initial axial impeller mounted before the centrifugal impeller of the first stage in the suction casing with the axial inlet, which results in the fact that the required anti-cavitation NPSH surplus of the WHI pump is lower than for the WHA pump.

WHG pumps - with the self-priming member and the initial impeller

A self-priming pump, adapted to pumping of the medium with temperatures of up to 80^oC within the resistance range of the material used for its construction, with increased suction properties (with lowered NPSH). The WHG pump sucks by itself the liquid from the tank located below the pump axis, provided its previous priming. The ability of self-priming is performed identically as in the WHS pump. The WHG pump is provided with an additional initial axial impeller mounted before the centrifugal impeller of the first stage in the suction casing and with the axial inlet, which results in the fact that the required anti cavitation NPSH surplus is lower than for the WHA and WHS pumps.

Advantages

• High efficiency,
• Good anti-cavitation properties,
• Variety of material versions,
• Ability of liquid self-priming (WHS, WHG)
• Simple design,
• Possibility of changing the angle of the suction flange,
• Application of shaſt protection sleeves and replaceable wear rings.