A control valve should be sized from process conditions rather than line size. Oversizing causes poor control, noise and rapid trim wear.
Flow cases
Provide minimum, normal and maximum flow with upstream and downstream pressure.
Fluid properties
Density, vapour pressure, viscosity, temperature and gas compressibility affect sizing.
Operating risks
Check cavitation, flashing, choked flow, aerodynamic noise and outlet velocity.
Control package
Define fail action, signal, positioner, air supply and required shut-off class.
Information to include with an enquiry
Provide nominal size, pressure rating, medium, temperature, connection standard, materials, operating method, required testing and project documentation. Greysen will review the duty and confirm the final configuration in the approved data sheet.
