How to choose the valve according to the flow characteristic
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Valve opening and closing pieces and the shape of the valve channel to the valve has a certain flow characteristics. When choosing a valve, this must be taken into account. 1. Turn on and cut off the medium valve is usually selected flow resistance is smaller, the channel is straight-through, the valve. Such valves have gate valves, globe valves, plunger valves. Closed down valve, due to tortuous channels, flow resistance than other valves, solid less choice. However, closed-type valves are also available where higher flow resistance is permitted. 2. Flow control valve is usually used to choose easy to regulate the flow rate of the valve, such as regulating valve, throttle valve, plunger valve, because of its seat size and opening and closing parts of the king of the relationship between the proportional. Rotary (such as plug valves, ball valves, butterfly valves) and wedge valve body type (pinch valve, diaphragm valve) can also be used for throttling control, but usually only in a limited range of valve caliber. In most cases, people usually change the valve flap valve shape after the throttle. It should be pointed out that it is very unreasonable to change the opening height of the gate valve or the shut-off valve because the medium in the pipeline has a high flow rate under the throttling condition and the sealing surface is easily washed out, worn, lost in cutting, and sealed . In the same way, it is unreasonable to use a throttle valve as a disconnecting device. 3. For divert valve with diverting diversion needs, this valve can have three or more channels, suitable for use plug valves and ball valves. Most of the diverting valves are used for this type of valve. In some cases, two or more other types of valves are properly interconnected and diverted to the media. 4. Valves for media with suspended particles If the media contains suspended particles, the valve is most suitable for use with its opening and closing parts sliding along the sealing surface wipe, such as flat gate valve.