How do you design spray water control valves for desuperheaters?

Desuperheater spray valve design: calculate spray water flow range (based on steam flow and temperature range), size valve for required Cv with appropriate rangeability (50:1 minimum), ensure adequate differential pressure for atomization, select materials compatible with high-temperature cycling, anti-cavitation trim if operating near flash conditions, and coordinate with spray nozzle design. Control considerations: cascade control from outlet temperature, feed-forward from steam flow, fast response for load changes, and protection against spray into saturated steam (damage to piping). Strainer upstream prevents nozzle clogging. Consider multiple valves or variable orifice nozzles for wide turndown.