When the air control valve is working, outside the tube, the inner diameter of the cylinder represents the output force of the cylinder. Aluminum alloy die casting is often used. The rod side end cover is equipped with a sealing ring and a dust ring. Some micro cylinders use brass materials to prevent Air leaks out from the piston rod and prevents external dust from mixing into the cylinder. Nowadays, in order to reduce weight and prevent rust, the rod side end cover is equipped with a guide sleeve. The guide sleeve is usually made of oil-containing alloy. The pneumatic air control valve works In order to reduce the downward bending of the piston rod when it extends and extend the service life of the air control valve, the copper casting is tilted forward to bear a small amount of lateral load on the piston rod. Some also have a buffer mechanism in the end cover to improve For the guidance accuracy of the cylinder, the end cover used to be made of malleable iron, and the end cover was equipped with intake and exhaust ports.