Cage (except for Whisper Trim III and Cavitrol III constructions)
Valve Size, NPS
Quick‐opening
Equal percentage
4x2
Linear
Whisper Trim I
Quick‐opening
Equal percentage
6x4x2‐1/2
Linear
Whisper Trim I
Quick‐opening
Equal percentage
6x4 or 8x4
Linear
Whisper Trim I
Quick‐opening
Equal percentage
8x6 or 12x6,
Linear
except for
Whisper Trim III
cages
Whisper Trim I
Quick‐opening
Equal percentage
10x8 or 12x8
Linear
Whisper Trim I, NPS 10x8 valve only, 102 mm (4‐inch) travel
1. Standard stainless steel is CB7CU‐1 (S17400 H900). S41600 (416 SST) is standard for Whisper Trim III cages in NPS 8X6 and NPS 12X6 with 5.375 inch port.