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1. Where to find a liquid flow controller?
2. Two flow meters, if one valve is not open, will there be flow?
When one valve of the two flow meters is not open, there is generally no effective flow in that circuit, and only a small amount of flow will occur under abnormal working conditions such as valve leakage and pipeline sealing failure..
1. Normal working conditions 1 Conventional parallel branch scenario: Two flow meters correspond to independent process fluid branches, each equipped with a dedicated shut-off valve. When one of the valves is not open, there is no effective pressure difference between the front and rear of the pipeline, and the fluid cannot pass through the branch. The flow meter will not generate a flow signal, and there will be no effective flow reading.
2. Rare series connection process scenario: If two flow meters are connected in series in the same main pipe flow band, closing either valve will directly cut off the main pipe fluid path, and there will be no flow generated in both channels.
2. Trace flow rate under abnormal operating conditions 1 Valve leakage: The unopened valve core seal is worn, aged, or installed incorrectly, making it impossible to completely cut off the fluid. A very small amount of fluid will flow through the corresponding flowmeter through the valve core gap. At this time, the flowmeter may display a very small flow value, but it is usually lower than the minimum measurement accuracy of the flowmeter, making it difficult to effectively collect or identify. 2. Pipeline sealing failure: The flange, weld joint, and other sealing structures of the two pipelines are damaged, which can cause flow between the two pipelines. A small am
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3. What letters should be used to replace electrical valves, flow meters, and liquid levels?
In industrial automation instrument identification systems, there are clear specifications for the letter codes of electrical valves, flow meters, and liquid levels: V/CV for valves, F/FT/FC for flow meters, and L/LT/LC for liquid levels.
. 1. The identification of electrical valves is usually represented by "V" in the process diagram (corresponding to the English valve). If it involves control functions, then use "CV" (Crack Control Valve), such as the actuator for automatic flow regulation with a closed structure2. Identification rules for flow meters Flow related instruments are based on the code "F": - Flow transmitters are labeled as "FT" (Flow Transmitter); -Flow Controller (FC) is commonly used in closed-loop control systems. 3. Labeling method for liquid level instruments. The core code for liquid level measuring equipment is "L" (Level): - The fixed label for the liquid level transmitter is "LT" (Level Transmitter); -The liquid level control unit adopts "LC" (Level Controller) for maintaining the liquid level of storage tanks or reactors.
4. It is generally better to install valves in front of or behind the flowmeter. Valves
Valves can be installed in front of or behind the flowmeter, but the distance from the flowmeter must be at least 10 times the diameter of the pipeline, so that the flow state changes caused by the opening of the valve spine will not affect the detection of the flowmeter.
. When using a flow meter to detect fluid flow, regardless of the m