Gate valves (GVA) and angle valves (AVA) offer a lightweight aluminum design for easier handling. Valve sizes range from 2 to 24 in. (50 to 610 mm) and are offered with ASA flanges (optional flanges available on request). In a situation where there is loss of power and/or pneumatic pressure, the valve closes, isolating the vacuum system. An optional indicator is available, which provides indication of the open and closed positions. The valves are suitable for isolation of roughing lines and forelines in vacuum processes where high conductance is required.