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Valves are
devices which are used to regulate liquids, gases and slurries. Valves do this
by controlling the flow through pipes and other passageways by opening and
closing and partially obstructing the passageway or pipe.
Many other types
of valve are also found in the average household such as the valves which
regulate the gas to a gas cooker, or valves which are used by washing machines to
regulate the flow of water going to and from the machine.Simple valves such as
hand operated valves can be manually controlled by the use or turning of a
handle or wheel. Other more complex valves are automated and work by external
input. These types of valve usually require an actuator. The actuator works by
stroking the valve depending on the set-up and input. This type of set-up
allows the valve to be positioned and in turn allows control across a range of
requirements.
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The majority of
these mechanical valves are used on pipes and some of the major industries
which use them are:
Oil industry
Gas industry
Mining
industries
Water and sewage
industries
The most
noticeable type of valve is the hot and cold tap which is found in every
household and many types of industries.

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