The valve is a low-platform rising pole industrial straight stroke pneumatic gate valve (double-layer cylinder with buffer mechanism) and manual with protection mechanism (manual and self-locking air manual switching device). Adopting a double-layer cylinder structure, fundamentally solves the common problem in single-cylinder pneumatic gate valves that the valve body wedge is stuck and cannot be opened. It is also equipped with a buffer mechanism, reducing wear on the sealing surfaces and preventing the gate from seizing.