due to the difference between upstream and downstream pressure, logistics flow through the valve, it is called the pressure drop & lt; OP) Or pressure difference. If the line size valves upstream and downstream of the valve is the same and even the degree of both is constant, the valve must be after friction loss and reduce the fluid pressure to produce flow. 'part of the above loss caused by fluid and valve wall friction press. But the friction is small, can't born enough for proper fluid pressure drop. Make the valve produces obvious pressure loss more effective method is through the throttle valve body. Because many valves are designed to allow the valve part more narrow than pipeline, it can easily provide throttling in the fluid layer. Because of the law of conservation of, when fluid near the Industrial Valves, in order to make all flow through the valve, to increase its speed. On the other hand, the corresponding pressure drop ( In figure 9. 1) 。 Pressure and velocity of the inverse relationship, said by Bernoulli formula is as follows:

maximum velocity and minimum pressure occurred in the narrow neck in the downstream, it is called a contraction section. In figure 9. Throttling 2 say contraction section is not in itself, but in the downstream of the throttle of a distance, the distance with the stress involved. In the contraction section gangrene velocity is one of the biggest speed, the flow area of the logistics level are its minimum value.

after the contraction section, logistics slow and pressure rise again, but did not reach the upstream pressure value. Pressure of upstream and downstream is the difference between the logistics flow through the valve caused by friction loss, it is called a permanent pressure drop. Contraction section of the pressure differential between the pressure and the downstream pressure value is called the pressure recovery. Permanent pressure drop and pressure recovery simple graphics as shown in figure 9. 3.

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