General installed in the valve cylinder and the cylinder valve between the tube close to the road, so that the exhaust cylinder without a valve directly into to the cylinder for the purpose of rapid.

The use of hydraulic cylinder in hydraulic elevator, the part usually has five parts: piston and piston rod, cylinder and cylinder head, buffer device, sealing device and exhaust device.

As the piston moves up it is compressed, the spark plug ignites combustion, and exhaust exits through another hole in the cylinder.