A consideration for this type of installation is the change in fluid momentum due to opening or closing of the valve.

If the valve is in a service where opening and closing stroke times are long, then the forces are unlikely to be of concern.

If the valve has a rapid opening time (for example turbine bypass valve service), then the forces generated may be significant - you will need to look at the valve stroke time and the consequent change in mass flow from zero to full flow over this time.

Stroke times for hydraulic valves can be in the range of 0.5 - 1.0 s, whilst pneumatic valves can take from 2.0-5.0s.

Also, in order to keep nozzle loads to a minimum, turbine piping systems are often 'hung' and only guided where necessary (the local seismic design requirements often govern here), therefore can be sensitive to imposed forces such as these changes in momentum, or pressure relief reactions.