6 replies to this topic

[mohammad reza]

for which reasons in some plants, control valve is located in vertical position?

thanks

[fallah]

for which reasons in some plants, control valve is located in vertical position?

thanks

May be due to space shortage in horizontal dierection!

[ARAZA]

Hi There,

I agree with Fallah. I'm in the Pilot plant business and most of my plants go on a module and have a limited space and hence we have to assemble the whole plant in a limited space. I've seen most of our control valve installed vertically and there is no problem in doing that as far as the perfomance goes. But there might be maintenance issues such as removing the big control valve for repair etc..

ARAZA

[Jiten_process]

ARAZA

Dont we have to consider process implication like additional liquid head imposed on control valve??

It means while giving downstream pressure we have account the pressure due to liquid vertical head if any....right?

[djack77494]

I would think that the vertical position is preferred. With a control valve sitting vertically, actuator above valve, maintenance should be easier. Remove the actuator and you can lift out the valve trim while losing none or at least a minimum quantity of what's in the valve. I'd think that any other position would entail greater likelihood of lost material.

[fallah]

I would think that the vertical position is preferred. With a control valve sitting vertically, actuator above valve, maintenance should be easier. Remove the actuator and you can lift out the valve trim while losing none or at least a minimum quantity of what's in the valve. I'd think that any other position would entail greater likelihood of lost material.

Would you please answer to below questions:

-How is your suggestion to support the control valve in vertical position?

-Considering drain valves in upstream/downstream of control valves in horizontal position,may we have lost material when removing the valve trim in horizontal position in comparison to vertical position?

[djack77494]

fallah,
I have seen many control valves situated vertically and supported by the associated piping. Even some pretty large CV's are done this way, though I can imagine that at some point it may be better to separately support the CV. I see no problem with drain valves. They should be mounted in the piping up and downstream of the CV and can be oriented vertically downward. I don't mean to suggest that mounting the CV vertically is the only or even the best way to do things. Probably the most common situation I have seen has the actuator mounted about 45 degrees from vertical, pointing towards where the operator would be. This allows for a bypass globe valve to be conveniently mounted directly above the body of the CV.