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@Kobe29261
9 ай бұрын
When the bypass is open does it not defeat the purpose of the Pressure reducing valve by feeding 45 psi directly into whatever is downstream?
@nadeemmallick7453
Ай бұрын
If control valve is 100% closed so will water pressure drop or not?
@mkbhuin6193
Жыл бұрын
Does pressure control valve needs any bypass line.
@Coreengineers
Жыл бұрын
Yes It requires but not always! in case if there is condensate line, steam line and malfunction occurs....you could simply take it in local mode and take the fluid in line via bypass but if there is process fluid and in many cases we don't provide the bypass line their in the control valve so if any malfunction occurs there whether it could be attend online or via shutdown or in shutdown.
@leonguyen9760
Жыл бұрын
I have a question After maintenance, how to open 2 bottom valves safety to back fluid to the normal line? I mean, 2 valves, which valve we open first? Many thanks!
@Coreengineers
Жыл бұрын
first open the upstream valve of CV slowly slowly then downstream one in same fashion or you may open then both valves if there is shutdown and now its time to startup.
@leonguyen9760
Жыл бұрын
@@Coreengineers thanks for your response. The pump is still working (not shutdown), i open valves slowly but i dont understand why the pressure is very high although the flow rate is small.
@Nk-nw9qj
Жыл бұрын
Is the bypass line a smaller size than the main line
@Coreengineers
Жыл бұрын
yes mainly we keep the same
@khunteatishanil6546
Жыл бұрын
can u please tell why globe valve is installed near TEE not in centre and wat is cailed FC & FO in control valve
@Coreengineers
Жыл бұрын
globe valve is used because you can control the downstream flow very easily here and FC and FO means Fail to close and Fail to Open w.r.t Air respectively.
@khunteatishanil6546
Жыл бұрын
I m asking about why globe valve is installed close to tee it can also be installed in centre
@mayurteli9287
3 ай бұрын
If there is leakage from CV which just above the glove valve, the leakge fluid can fall on globe valve, so globe valve doesn't put in centreline of CV.
@GaddarKerim1
6 ай бұрын
This is out of date. We shouldn't rely on manual control. Additionally, bypass valves may fail and the control valve requires double block&bleed valves to isolate safely.
@Coreengineers
6 ай бұрын
Valid point! But there are many existing plants having this provision
@muhammadtalha3163
2 жыл бұрын
Because the steam has lighters density as compared to water and steam is used both by pass line as well as normal line and steam used both line for the flow
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