1. valve definition by valve techologies organizaton:
Valves control or interrupt flow. Basically, they have bodies furnished with flanged or screwed ends (or ends prepared for welding) for connection to the joining pipes and internal passages arranged so that they can be restricted or closed, this is done, in valves,by lowering, raising or rotating a disc in relation to a seating surface or by controlling the movement of a ball.
2. valve types that china valve manufacturers can make.
the most commonly used valves fall into the following categories:globe valves, gate valves, butterfly valves, check and non-return valves and control valves. all these types valve can be manufactured by valve suppliers china.
3.The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipe. china valve components suppliers export lot of such kind of valve components castings abroad every year.
4.Unlike the globe valve,gate valves give full bore flow without change of direction. a gate can be moved in a direction at right angles to the flow by ascrewed spindle working in a nut.valve accessories suppliers in china made OEM such kind of valve parts according to importers' drawings.
5.A check valve is another name for a non-return valve, it allows flow in one direction only.
6. A relief valve can be used to ease excess pressure.lt consists of a disc held closed by a spring-loaded stem. the compression on the spring can be adjusted so that the valve opens at the desired pressure.
Usually valve and fittings fitted in engine rooms,boiler rooms,pump rooms and shaft tunels are to be easily_accessible for operation.Where the valves and fittings are situated under the floor plate.not easily accessible for operation, they are to be provided with extended operating_rods or tools for operation.
Furthermore holes are to be cut in the floor plate under which the valves or fittings are located and to be provided with covers.
hope valve world 2016 can have a good year.
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