Choose valves must first know the performance of the medium, flow characteristic, and properties, such as temperature, pressure, flow velocity, flow rate, and then, combined with process, operation, safety factors and the corresponding type, structure, model specifications of the Industrial Valves. According to traffic characteristics to choose the shape of the valve opening and closing a valve and valve port valve have a certain flow characteristic. When choosing the valve, must consider this. ( 1) Truncation and on medium with valve usually choose small flow resistance, flow channel for straight through the valve. This type of valve gate Industrial Valves, globe valve, plunger valve. Closed down type valve, due to the port twists and turns, flow resistance is higher than other valves, so less to choose. However, in the higher flow resistance is allowed, also can choose close type valve. ( 2) Control flow valves are usually choose easy to flow adjusting valve. Such as regulating valve, throttle valve, plunger valve, because the seat size and rev firmware schedule proportional relationship. Rotary ( Such as plug valve, ball valve, butterfly valve) And deflection type ( Clip pipe valve, diaphragm valve) Can also be used for throttling valve control, but usually only apply within the size of the valve co. , LTD. In most cases, people usually use after the change of globe valve disc shape for throttling. It should be pointed out that, with the change of a gate or globe valve opening to implement throttling effect is very reasonable. Because, medium in throttling state in pipeline, the flow velocity is very high, easy to wash and wear on sealing surface, cut off the seal mechanism, in the same way, with a throttle valve as cutting device is unreasonable. ( 3) Reversing shunt valve according to the needs of the reversing shunt, this kind of valve can have two or more channels, suitable for choosing cock valve and ball valve. Most of the valves are used in the reversing shunt choose this kind of valve. In some cases, other types of valves, with two or more properly connected each other, also can be used as a medium of the reversing shunt. ( 4) Medium with suspended particles with the valve if medium containing suspended particles, the most suitable for using the open-close part along the sealing surface of slide valve with wiping, such as flat gate valve. Key words: the selection of the valve valve flow characteristics of the valve connection
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