These NEW MKS Instruments ISO-LF NW63 Series 150 Bellows Angel Valves are designed to insure product quality, reliability and value. These bellows angel valves function reliably in applications ranging from semiconductor manufacturing to plasma physics research to nuclear accelerators. These angle valves are primarily for vacuum processes. Sometimes the valves encounter pressures above atmospheric in gas handling, or in backfilled systems. These valves may be used over the pressure range from 10-9 Torr to 15 psig. The bellows design and closing force provide reliable operation to the maximum pressures stated.