How do you design anti-surge valves for centrifugal compressors?

Anti-surge valve design requirements: fast opening (1-2 seconds from closed to open), high capacity (pass surge flow at surge conditions), reliable positioning (critical safety function), and ability to modulate during normal operation. Design elements: oversized actuator for fast response, volume booster or quick-exhaust for fast fill/exhaust, positioner with high air capacity, fail-open action, hardened trim for frequent cycling. Sizing: calculate surge flow and pressure conditions, size for full surge protection with margin. Location: close to compressor discharge minimizes piping volume. Testing: verify stroking time, document response. Often separate from recycle control valve for independent operation.