To comment sensible on any valve, you would normally like to have most possible of following information:
Fluid?
Clean fluid?
Temperature?
Pressure? (fore, after. differential, variations)?
Flow, high, low, normal for each phase.
On/off or regulation, if regulation specify variations
Approx. size/range of valves
Valce pressure class , type of end/valve class.
Any particular form, art or brand of valve (in addition to angle)
Any other significant operational or flow data?
If necessary operatinal data (For actuatorr selection)
etc. etc.