The cement manufacturing process is comustion. The main processes are combustion process, the main tool used is rotary kiln or rotary kiln. Inside the kiln occurs the process of calcination (up to 100%), sintering, and also clinkering. The temperature of the material entering the rotary kiln is 1100-1400oC, while the clinker temperature coming out of the rotary kiln is 800-900oC. Burning process in kilns using a tool so called burner employs coal as the main fuel with the cost as well as coal reserves consideration. Due to the coal used as its fuel, it is necessary have a special treatment when the coal line repair process takes place. The coal must be isolated to avoid outer air (oxygen) contamination therefore it will not affect the coal contents when it will be used for initial ignition. It is also used for preventing explosion and fire hazards due to a repairing process can produces sparks or heat given as the fire triangle theory states that fire arises because of the fuel, air, and the source of fire or heat, In order to prevent the dangerous event it requires a special isolation system to close the coal channel during the maintenance process takes place. The objective of this study is to design an implementation of Knife Gate valve using a pneumatic system in Main Burner and Calsiner burner in order to isolate the remaining fuel in the burner channel. Therefore, it will not be influenced by the outside air (oxygen) to avoid the fire or explosion hazard. Knife Gate Valve regulates coal channel with the automatic control system from Central Control Room (CCR) so it does not need to be manually operated by humans. Hence, it ensures the safety of personels. As an addition, the implementation of this safety system refers to the rules applicable in PT Holcim Indonesia Tbk, that all equipment that has an explosion risk must comply with ATEX (Atmosphere Explosion) regulation. In other words the installation of Knife gate in Main Burner and Calsiner Burners meant for a safety device during the maintenance of burner process to avoid fire.