How to choose the right valve according to the flow characteristics
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Release Time：2017-09-22
Valve opening and closing parts and the shape of the valve flow so that the valve has a certain flow characteristics. This should be taken into account when selecting valves. 1, cut off and connected to the medium used in the valve usually choose the flow resistance is small, the flow channel is straight-through valve. This kind of valve has gate valve, globe valve, plunger valve. Downward closed valve, due to the flow twists and turns, flow resistance is higher than other valves, it is less selected. However, in the case of higher flow resistance, closed valves can also be used. 2. The valve used to control the flow is usually a valve that is easy to adjust the flow. Such as regulating valve, throttle valve, plunger valve, because its seat size and opening and closing parts of the stroke
Valve opening and closing parts and the shape of the valve flow so that the valve has a certain flow characteristics. This should be taken into account when selecting valves.
1. The valve used to cut off and connect the medium
Usually choose a small flow resistance, flow channel for straight-through valves. This kind of valve has gate valve, globe valve, plunger valve. Downward closed valve, due to the flow twists and turns, flow resistance is higher than other valves, it is less selected. However, in the case of higher flow resistance, closed valves can also be used.
2. Valves used to control flow
Usually choose a valve that is easy to adjust the flow. Such as regulating valve, throttle valve, plunger valve, because of its seat size and opening and closing parts of the stroke between the formation of a positive proportional relationship. Rotary and flexible body valves can also be used for throttle control, but usually only within a limited range of valve calibers. In most cases, it is usually used to change the shape of the cut-off valve for throttling. It should be pointed out that it is extremely unreasonable to change the opening height of the gate valve or the stop valve to realize the throttling effect. Because the medium in the pipeline is in the throttling state, the flow rate is very high, the sealing surface is easy to be washed and worn, and the sealing effect is lost. Similarly, it is unreasonable to use the throttle valve as a cutting device.
3. Valve used for reversing shunt
According to the diversion needs, this valve can have three or more channels, suitable for the selection of plug valves and ball valves. Most of the valves used for commutation shunt are selected for this type of valve. In some cases, other types of valves, with two or more only properly connected to each other, can also be used as a medium diversion.
4. Valves used for media with suspended particles
If the medium with suspended particles, the most suitable for its opening and closing parts along the sealing surface of the sliding with a wiping effect of the valve.
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