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Wafer-type design

The wafer-type valve design is used for special globe and butterfly valve applications; wafer-type ...

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Warranty tolerance

The warranty tolerance is the permissible level of deviation from the value guaranteed by the ...

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Waste water lifting unit

Waste water lifting unit: Above-floor box

Waste water lifting units serve to automatically drain water from washbasins, showers, washing ...

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Waste water pump

Waste water pump: Horizontal waste water pump with channel impeller

Waste water pumps transport heavily contaminated water which often contains solid particles of ...

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Water consumption

Water consumption generally means the consumption of water in the domestic environment. By comparing ...

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Water hammer

Water hammer describes a violent surge pressure in a pipe when two water columns collide after a ...

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Water hardness

The hardness of water is defined as the presence of ions of alkaline earth metals dissolved in the ...

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Water jet pump

The water jet pump is a self-priming pump which has no moving parts. See Fig. 1 Water jet pump ...

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Water requirement

The water requirement is the quantity of water needed by a machine or device for the successful ...

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Water ring pump

Water ring pumps are liquid ring pumps which work according to the principle of positive displacement ...

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Water supply pump

The term water supply pump refers to all centrifugal pumps which transport drinking or service water ...

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Waterworks pump

A waterworks pump is a centrifugal pump which is used for the public drinking water supply of ...

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Wear

Wear is an attrition phenomenon (i. e. the gradual loss of material from the surface of a solid body) ...

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Weight

Weight is the force (FG) exerted on a body with mass (m) due to the influence of a gravitational ...

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Wet cooling

Wet cooling is a cooling process used in power stations. This process comprises a condenser which ...

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Wet rotor motor

A wet rotor motor is typically an asynchronous squirrel-cage motor (see Asynchronous motor) whose ...

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Wet well installation

Wet well installation is mainly used for large vertical pumps. This means that the pump casing can – ...

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Wood pulp

Wood pulp consists of fine wood fibres. It serves as an important raw material for manufacturing ...

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Work

Work (W), as a physical entity, is the energy used in order to displace a body over a distance (s) by ...

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