Issues regarding the installation location and orientation of control valves
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Discussion: 1. The comparison diagram of the installation positions of control valves is shown below. (1) Which installation location is the best one? (2) Which installation location is the secondary installation location? (3) Which installation location is the worst, and should be avoided as much as possible? (4) If there is not enough space, which installation location(s) can be chosen?
If it’s just a global valve like yours, 1 is the best choice; 3, 4, and 5 won’t work. If there’s really no space for installation, then choose 2.
I can’t view the image. Generally, the optimal installation location for a control valve is in the horizontal section of the pipeline, with the valve’s actuation mechanism facing upward; this facilitates maintenance and heat dissipation from the actuation mechanism. This is likely what you mean by situation (1). An alternative location could be on a vertical pipe, with the valve body of the control valve at the bottom and the actuation device at the top. The worst installation position is usually when the drive unit faces downward, as this can cause the internal components and the drive unit to be damaged by condensed water or contaminants. If there is insufficient space, it may be necessary to choose installation in horizontal or vertical pipes, but ensure that the drive unit does not face downward and is easy to operate and maintain. .
For reference: “Control Valves and Valve Positioners”.
The correct position is 1; if that’s not possible, then 3 can be chosen, but all other positions should be avoided. For straight-stroke diaphragm control valves, positions 2, 4, and 5 all subject the valve stem to lateral forces, which affect the valve’s operating performance and lead to wear; this effect is intensified in the presence of pipeline vibration ； The defect at position 3 is the possibility of material pouring onto the actuator. The above statement applies only to plug-type straight-stroke diaphragm control valves. .
This post was last edited by zhouds on 2024-1-18 08:49. 1. Location ① is the best installation location. 2. Location ② is a secondary option. 3. Position ⑤ is the worst position and should be avoided as much as possible. 4. Location ③ can be selected.
Best is 1, second choice is 2/5. Worst is 3
Only 1 is possible; there is no space to create more space.
I majored in process engineering, and the data sheet for instrument selection specifies that steam control valves or pressure relief valves should be installed in reverse orientation, as indicated by legend③; all other valves should be installed in normal orientation, as indicated by legend①. There is no difference during the actual construction instructions; only for steam is it required to be installed in reverse order
Let me put it this way: good things are installed on good things, and no matter how they’re installed, they will still work well! If the design pressure and packing seal are fine, it can be used without issues; but if there are problems, no matter how it’s installed, there will still be problems: lol