what is the relationship?

a port area and the velocity and flow of the valve has immediately related, and flow velocity and flow rate are interdependent 2 quantities. When traffic must flow velocity, flow area can be smaller; Small flow rate, flow area can be larger. On the contrary, the flow area of big, its velocity is small; Port area is small, its velocity.

medium velocity is large, Industrial Valves size can be smaller, but friction damage is very big, the Industrial Valves easy to destroy. Velocity, electrostatic interactions, medium of inflammable and explosive items will cause lead to risk; Low velocity is small, high efficiency, no economic development. For king kong level of flammable and explosive medium viscosity, the flow rate of the persons to be smaller. Oil and viscosity of liquid with viscosity size select velocity, generally take a 0. 1～1m/s。

general situation, the traffic is known, the velocity can be made of work experience. According to the flow velocity and flow rate to calculate nominal pressure of the valve size.

the same Industrial Valves size, its structure form, the liquid friction resistance is different also. Under the same standard, the greater the resistance coefficient of valve, flow velocity and flow of the liquid according to the valve to reduce the more; The smaller the resistance coefficient of valve, flow velocity and flow of the liquid according to the valve to reduce less.

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