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1. Requirements for installation distance of porous flow orifice plate
The core requirement for installation distance of porous flow orifice plate is to ensure the length of the front and rear straight pipe sections to ensure measurement accuracy. The basic requirement is a front 10D and a back 5D, but the specific length needs to be determined based on the on-site pipeline conditions and aperture ratio (β value) according to ISO 5167 or GB/T 2624 standards. 1. General installation distance requirements: In general scenarios, the basic requirements for the front and rear straight pipe sections of porous flow orifice plates are: • Upstream straight pipe section (front straight pipe section): length of at least 10 times the inner diameter of the pipeline (10D) • Downstream straight pipe section (rear straight pipe section): length of at least 5 times the inner diameter of the pipeline (5D). 2. Extension requirements in the presence of disturbance sources. If there are disturbance components such as valves and elbows upstream, the length of the straight pipe section needs to be significantly increased to meet measurement requirements. Liang Zhu | Type of disturbance source | Minimum length of front straight pipe | Minimum length of rear straight pipe | |: --- |: --- |: --- | | | Single elbow or tee | 10D -20D | 5D | | Double elbow in the same plane | 30D -50D | 5D | | Regulating valve (fully open state) | 50D -100D | 10D | | Shrinking pipe (diameter ratio ≤ 0.7) | 10D -20D | 5D | 3. Aperture ratio (β value) The influence of rubber lag on aperture ratio β (β=orifice plate opening diameter/pipe inner diameter) is a key parameter that determines the length of straight pipe. The smaller the beta value, the stricter t
2. Flow Calculation Formula for Throttle Valve
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1. Flow Calculation Formula for Throttle Valve Splitting
The flow calculation formula for throttle valve is mainly based on Bernoulli equation and fluid mechanics principles, including the following key formulas: p>1. Theoretical Flow Formula: Q=A * v, where Q represents flow rate, A represents cross-sectional area of throttle valve, and v represents flow velocity.
. This formula indicates that the flow rate through the throttle valve is proportional to the cross-sectional area and flow velocity of the throttle valve. p >2、 The formula for calculating flow velocity is Q=A1 * v1=A2 * v2, where A1 and A2 respectively represent the cross-sectional areas of the inlet and outlet of the throttle valve, and v1 and v2 respectively represent the flow velocities at the inlet and outlet. This formula represents that the flow rate through the inlet and outlet of the throttle valve is equal. p >
3、 Formula for flow coefficient: Cv=Q/sqrt (Δ P), where Cv represents the flow coefficient, Q represents the flow rate, and Δ P represents the pressure difference on both sides of the throttle valve. The larger the flow coefficient, the greater the flow rate of the throttle valve. p >
4、 Flow rate formula: Q=C * A * sqrt (Δ P), where C represents the flow coefficient, A represents the cross-sectional area of the throttle valve, and Δ P represents the pressure difference on both