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Definition statement
This subclass covers:

Steam traps defined by devices or special automatic valves for discharging condensate and non condensable gases from live steam with less possible loss or consumption of live steam. Furthermore not only steam traps are covered but also all kind of apparatus or valves and component parts and accessories thereof for draining-off liquids from enclosures, gas lines, steam lines or containers containing gases or vapours. Said valves are controlled thermally (thermostatically, bi-metallically driven valves), by excess or release of pressure (thermodynamically driven valves), by floats (mechanically driven valves) or controlled without moving parts (Venturi-type or labyrinth-type).

Relationship between large subject matter areas

Valves in general are classified in F16K. Steam engine plants where engine aspects predominate are classified in F01K, domestic central heating systems using steam are classified in F24D, heat exchange or heat transfer in general is classified in F28 and the generation of vapour in cores of nuclear reactors is classified in G21, steam boilers in general in F22B and devices for superheating steam in F22G.

References relevant to classification in this group
This subclass does not cover:

Degasification of liquids

Valves for removing gases or air from condensate

Treatment of water, waste water or sewage by degassing

Informative references
Attention is drawn to the following places, which may be of interest for search:

Devices, e.g. valves, for venting or aerating enclosures

Special rules of classification within this group

Attention is drawn to the definition of "steam" and "vapour". In cases where a specific entry for vapour is missing, documents related to special vapours are classified in groups where only "steam" is explicitly mentioned.

Synonyms and Keywords

In patent documents the following words "deaeration" and "degasification" are often used as synonyms.

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Last Modified: 10/11/2013