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Four Main Functions of Valves
Release time:
2017-06-21
Source:
Industry News
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1. Close and open media
The flow path is a straight-through valve with a small flow resistance and is usually selected as a valve for cut-off and open media.
Down closed valve (cut-off valve, plunger valve) due to its channel twists and turns, flow resistance than other valves, so less use. Where a higher flow resistance is allowed, a closed valve is available.
2. Flow Control
It is common to select a valve that is easy to adjust the flow rate as a control flow. A closed valve (such as a shut-off valve) is suitable for this purpose because its seat size is proportional to the stroke of the closure.
Rotary valves (plug valves, butterfly valves, ball valves) and flexible valve valves (clamping valves, diaphragm valves) can also be used for throttle control, but are usually only available in a limited range of valve diameters.
Gate valve is a disc-shaped ramps on the circular valve seat to do cross-movement, it is only close to the closed position, in order to better control the flow, it is usually not used for flow control.
3. Reversal shunt
According to the need for commutation, this valve can have three or more channels. Plug valves and ball valves are suitable for this purpose, so most of the valves used for commutation shunt are selected for one of these valves.
However, in some cases, other types of valves, as long as the two or more valves are properly connected to each other, can also be used for commutation.
4. Media with suspended particles
When the media with suspended particles, the most suitable for its use of the closure along the sealing surface with a wipe the role of the valve.
If the closing movement of the closure is vertical to the seat, it is possible to hold the particles so that the valve is only suitable for substantially clean media unless the sealing surface material allows the embedding of the particles. Ball valve and plug valve in the opening and closing process on the sealing surface are wiping effect, it is suitable for use in medium with suspended particles.
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