Can a butterfly replace a gate?

Often on water/HVAC low-pressure lines; confirm pressure, dead-end, and leakage.

When is gate preferred?

High pressure, steam, and specs requiring rising-stem indication.

Isolation RFQs often choose between gate and butterfly based on pressure, face-to-face, and leakage class.

Topic	Gate	Butterfly
Face-to-face	Longer ASME B16.10	Short wafer/lug
Pressure	High class common	Typically lower PN/Class
Leakage	Metal seat capable	Soft seat common; metal seat HP butterfly available
Cost/weight	Heavier	Lighter
RFQ cue	OS&Y/NRS + class	Wafer/lug + seat + operator

State duty pressure/temperature and whether dead-end service is required.