Vertically installed control valve 7

[flinana]

Hi,
Peop`le have told me that conreol valves such as butterfly or globe valves should nor be installed vertically, however no one has been able to explain why. Can anyone please explain?

thanks

 

[flatlander1]

ValveEngineer123

Thanks!!

 

[itdepends]

Other than the loads induced by the actuator- valves installed horizontally are easier to remove/installe (vertical lift/place) compared to valves installed in vertical piping.

 

[BillBirch]

Referring to control valves, I sggest that pneumatic positioners should be mounted upright for the correct influence of gravity on the mechanical linkages?

Incidentally, several years ago I discovered several large conventional safety relief valves mounted sideways rather than upright during an offshore platform audit. These must be mounted upright as the plug and stem weight under gravity works in conjunction with the spring load,

 

[flinana]

BillBirch,

Funny that you mentioned the positioning of PSVs, I just had my mechanical guys change PSVs that were installed horizontally to the vertical position. PSVs installed horizontally must also be certified for horizontal position.