MACHINES positive displacement rotary or oscillating piston liquid and elastic fluid or elastic fluid liquid only reciprocating piston or other liquid and elastic fluid or elastic fluid liquid only non-positive displacement liquid and elastic fluid or elastic fluid liquid only ENGINES positive displacement rotary or oscillating piston liquid and elastic fluid or elastic fluid liquid only reciprocating piston or other liquid and elastic fluid or elastic fluid liquid only non-positive displacement liquid and elastic fluid or elastic fluid liquid only PUMPS positive displacement rotary or oscillating piston reciprocating piston or other non-positive displacement Attention is drawn to the Notes following the titles of class and subclass relating to "micro-structural devices" and "micro-structural systems". Attention is drawn to Note (2) following the title of subclass and also the subdivisions of that subclass, according to which pressure regulators and flow regulators, e.g. flow regulating valves with pressure compensator, even with the whole regulating system contained in a valve, operating with or without auxiliary power, are covered by groups or , respectively. However, details of the valve parts, per se, are classified in the appropriate groups of this subclass. Attention is drawn to the following places: Safety devices for pressure cookers Dispensing spouts, drain valves or like beverage-making apparatus Valves specially adapted for measuring pressure in heart or blood vessels Heart valves Valves specially adapted for medical respiratory devices Tube connectors, tube couplings, valves or branch units specially adapted for medical use in general Valves for respiratory apparatus Valves for breathing masks or helmets Fire extinguishers Nozzles, spray heads or other discharge apparatus for spraying or atomising Arrangements of tyre-inflating valves relative to tyres or wheel rims; Connection of valves to wheel rims, tyres or other inflatable elastic bodies Valves specially adapted for adjusting vehicle fluid-spring characteristics Valves specially adapted for vehicle brake control systems Vehicle power-assisted steering characterised by the type of valve used , Arrangement of inflating valves for floatable live-saving equipment Container closures with discharging valves , Nozzles or valves specially adapted for aerosol containers Safety valves for large containers Gates or closures on large containers Flow control devices for bottling liquids Dispensing, delivering or transferring liquids Details, e.g. valves, of barrages or weirs Closures for irrigation conduits Arrangement of valves in hydrants Flushing valves for water-closets or urinals Valve arrangement in door closers Valve arrangements in drilling-fluid circulation systems Valve arrangements for boreholes or wells Working-fluid valves for controlling machines or engines in general or of positive-displacement type Final actuators for controlling non-positive displacement machines or engines Cyclically operated valves for machines or engines Throttle valves for controlling combustion engines Propellant feed valves for rocket-engines Carburettors, fuel injection Valves for fuel injection pumps Pumps Valves for shock absorbers , Pipe joints or quick-acting couplings with fluid cut-off means Arrangement of valves in pipes Valves specially adapted to prevent or minimise the effect of water hammer Launching devices for pigs or moles Check valves for lubrication systems Arrangement of valves in pressure vessels Arrangement of safety valves on steam boilers Application of valves to automatic water-feed in boiler Valves for air supply control to burners Valves for lighters with gaseous fuel and adjustable flame , Arrangement of valves on stoves or ranges Air conditioning; Ventilation Disposition of fluid circulation valves in refrigeration machines Controlling non-electric variables Valves for organs Valves for other wind-actuated musical instruments. CONSTRUCTIONAL TYPES Lift-valves, gate valves or sliding valves, taps, diaphragm cut-off apparatus Multiple-way valves Other constructional types of cut-off apparatus, arrangements for cutting off FUNCTIONAL TYPES Check valves; safety or equalising valves; arrangements for mixing fluids ; ; Fluid-delivery valves; valves for preventing drip from nozzles ; For venting or aerating enclosures DETAILS OR GENERAL MEANS Handling or control , , , Auxiliary means , Safety , Details: contact between valve members and seats, housings, floats, sealings , , , Other details SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS In groups , an initial seal breaking or final sealing movement which is different from the opening or closing movement of the valve is not considered in determining the movement to be classified. Details not provided for in groups are classified in groups .