F.R.I Bellow Seal Valves can be gate or globe valves designed for applications requiring full stem sealing (Zero Leakage). They are used in vacuum service to prevent outside air from leaking into the pipeline when a vacuum pump continuously extracts air. They are also suitable for handling hazardous fluids such as chlorine, hydrogen, and ammonia. In applications involving costly fluids, these valves help prevent leaks to avoid fluid loss due to high cost. Additionally, they ensure compliance with environmental protection standards.