Applications for gate type valves include high pressure engine bleed shutoff, bi-level restriction (such as bi-level flow control when used with a pressure regulator), bi-directional cross-flow (for single engine operation), heat exchanger bypass, APU anti-surge and many other uses. ASC gate valves are qualified and used in military applications, helicopter applications, any zone in turboprop aircraft (including engine compartment) and most locations on turbofan aircraft ranging from engine pylon to tailcone.