Common cylinder operation is controlled by a pneumatic valve, when the need to open the pneumatic valve to control one end of the cylinder intake and exhaust at the other end, the need to close the pneumatic valve will control the other end of the original intake end exhaust, so every action has exhaust sound. ᱥᱤᱞᱤᱱᱰᱟᱨ ᱫᱚ ᱢᱩᱪᱟᱹᱫ ᱨᱮ ᱢᱤᱫ ᱜᱮᱴ ᱠᱟᱱᱟ ᱡᱟᱦᱟᱸ ᱫᱚ ᱢᱩᱪᱟᱹᱫ ᱨᱮ ᱵᱟᱝ ᱛᱟᱦᱮᱱ ᱠᱟᱱᱟ, ᱚᱱᱟ ᱫᱚ ᱢᱤᱫ ᱴᱟᱲᱟᱝ ᱞᱟᱹᱜᱤᱫ ᱢᱤᱫ ᱜᱮᱴ ᱠᱟᱱᱟ ᱡᱟᱦᱟᱸ ᱨᱮ ᱯᱞᱟᱜᱤᱱ ᱫᱚ ᱵᱟᱝ ᱵᱟᱹᱲᱤᱡ ᱜᱮᱭᱟ᱾ ᱱᱚᱣᱟ ᱠᱟᱹᱢᱤ ᱨᱮᱭᱟᱜ ᱢᱤᱫ ᱯᱟᱦᱴᱟ ᱫᱚ ᱦᱩᱭᱩᱜ ᱠᱟᱱᱟ ᱫᱷᱟᱹᱛᱩ ᱨᱮᱭᱟᱜ ᱴᱨᱤᱠ ᱠᱚ ᱾
