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The first choice of the valve to master the performance of the media, flow characteristics, and temperature, pressure, flow rate, flow and other performance, and then, combined with process, operation, safety and other factors, the choice of the corresponding type, structure, model specifications valve. 1 According to the flow characteristics of the valve valve opening and closing pieces and the shape of the valve so that the valve has a certain flow characteristics. When choosing a valve, this must be taken into account. (1) cut off and connect the media valve is usually selected with a smaller flow resistance, flow-through valve. Such valves have gate valves, globe valves, plunger valves. Closed down valve, due to tortuous flow, flow resistance than other valves high, so less optional. However, closed-type valves are also available where higher flow resistance is permitted. (2) The valve used to control the flow of the valve is usually easy to adjust the flow of choice. Such as regulating valve, throttle valve, plunger valve, because its seat size and the fastener stroke is proportional to the relationship. Rotary (such as plug valves, ball valves, butterfly valves) and flexure (pinch valve, diaphragm valve) valves can also be used for throttling control, but usually only in a limited range of valve caliber applicable. In most cases, people often use to change the shape of the cut-off valve valve for throttling purposes. It should be pointed out that it is unreasonable to achieve throttling by changing the opening height of the gate valve or the shut-off valve. Because, pipeline medium in the throttle state, the high flow rate, the sealing surface easily washed wear and tear, loss of cut off the sealing effect, the same token, with the throttle as a cutting device is unreasonable. (3) diverting valve with diverting diversion needs, this valve can have two or more channels, suitable for the selection of plug valves and ball valves. Most of the diverting valves are used for this type of valve. In some cases, other types of valves, with two or more properly connected to each other, can also be used as a diverter for 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 elements along the sliding surface of the sealing surface wipe, such as flat gate valve.
October 02, 2024