WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

V

97 results

V engine

energy

Consists of two cylinder banks—usually with the same number of cylinders in each bank—connected to a common crankshaft.

Vacuum

energy

A vacuum is space devoid of matter.

Vacuum cleaners

marine

Industrial vacuum cleaners can be used to remove shipyard debris (dust, weld slag and welding rod ends).

Vacuum toilets

marine

A new type of toilets operating on the vacuum principle. Usually, the vacuum is created by an ejector.

Value chain

energy

A value chain is a set of activities that a firm operating in a specific industry performs in order to deliver a valuable product (i.e., good and/or service) for the market.

Valve

marine

A device provided in a piping system to regulate or stop the liquid flow.

Valve cage

marine

A cylinder fitted with ports in which a valve plug moves. The port openings are shaped to produce various flow characteristics for different valves, e.g. linear or equalpercentage.

Valve characteristics

marine

The relationship between the valve lift and flow. It is of particular importance for the control valves. The common characteristics are quick-opening, linear and equal percentage.

Valve chests

marine

Valve chests are a series of valves all built into a single block or a manifold. Various arrangements of suction and discharge connections are possible in this assembly.

Valve disc

marine

A movable cover which provides a variable restriction to fluid flow. A control valve may have two discs or valve plugs which are specially shaped to create the Valve characteristics.

Valve manifold

marine

Sometimes suction must be taken from one of many sources and discharged to other units of either the same or another group. A valve manifold is used for this type of operation.

Van de Graaff generator

energy

A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials.

Vapor

energy

In physics, a vapour is a substance in the gas phase at a temperature lower than its critical temperature which means that the vapor can be condensed to a liquid by increasing the pressure on it without reducing the temperature.

Vapor lock

energy

Vapor lock is a problem caused by liquid fuel changing state to gas while still in the fuel delivery system of gasoline-fueled internal combustion engines.

Vapour compression chiller

energy

In a mechanical compression chiller technology, the coolant is circulated through a chilling coil heat exchanger that is inserted in the filter house, downstream from the filtering stage.

Vapour emission control system

marine

An arrangement of piping and other equipment used to control vapour emission during tanker operations, including ship and shore vapour collection systems, monitoring and control devices and vapour processing arrangements.

Vapour lines

marine

The vent pipes from cargo oil tanks. They are led to pressure/vacuum valves which are usually mounted on standpipes some distance above the deck.

Vapour lock system

marine

Equipment fitted to a tank to enable the measuring and sampling of cargoes without release of vapour/inert gas pressure.

Vapour pressure

energy

Vapour pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapour in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system.

Vapour-absorption chiller

energy

In vapor-absorption chillers technology, thermal energy is used to produce cooling instead of mechanical energy.

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