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How to choose the right fluid control valve

发表时间:2018-04-22 11:56:06 Article source: Publication time: 2018-04-22 11:56:06

How to choose a suitable fluid control valve? For example, the explosion-proof electric valve should first determine the type of control valve (such as selecting a butterfly valve, ball valve or diaphragm valve) according to the function of the engineering equipment, and then consider the basic parameters of the selected control valve. (Nominal pressure, nominal diameter, and applicable medium of the valve) Is it suitable for the pressure, flow rate, and variety of pipeline medium? In addition, according to the orientation of the equipment and the surrounding environment, the appropriate valve and pipeline connection method and valve driving method should be selected. Of course, the sealing function, opening and closing speed, operating sensitivity and other functions of the valve and the valve life and cost should also be considered according to needs.

It should be noted that the nominal pressure of the explosion-proof electric valve refers to the maximum workpiece pressure allowed by the valve at the reference temperature. When the working temperature exceeds the reference temperature, the maximum working pressure originally allowed by the explosion-proof electric valve will decrease, so it is necessary to pay attention when selecting it. For a copper alloy valve, if the nominal pressure relative to the reference temperature (120 ° C) is 4 kgf / cm2, when the operating temperature rises to 200 ° C, its maximum working pressure drops to 3.2 kgf / cm2. When the temperature rises to 250 ° C, its maximum working pressure further decreases to 2.7 kgf / cm2. Other conditions such as gray cast iron, malleable cast iron, ductile cast iron valve, and steel valve also have this situation.

The internal structure of the valve, the action characteristics of the opening and closing parts, and the orientation of the inlet and outlet channels are generally considered in the design of the equipment orientation of the explosion-proof electric valve on the pipeline. Species. When the valve equipment is on the horizontal pipeline, the straight-through type is generally selected; when the valve equipment is on the vertical pipeline, the vertical type is generally selected. [The above content is organized and released for you by the electric actuator ]

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