VALVE OF GAS EXHAUST SYSTEM

摘要

The present invention relates to a valve of a gas exhaust system. The valve comprises a valve body (10) having at least one main flow passage (11); a slide tube (20) that is slidably provided at the main flow passage (11) of the valve body (10) and has a discharge flow passage (21) communicating with the main flow passage (11); a gate plate (40) provided at the main flow passage (11) of the valve body (10) to be movable in a direction traversing the slide tube (20) so as to open or close an end of the discharge flow passage (21) of the slide tube (20); and an actuator (50) for moving the gate plate (40). According to the present invention, it is possible to avoid leakage of harmful gases and malfunction of the system by preventing a sealing portion for maintaining airtightness at the valve seat from being exposed to the harmful gases upon operation of the valve so as to avoid deposition of powder of the harmful gases, and to prevent the flow passage from being narrowed due to deposition of the powder of the harmful gases by means of nano-coating on an inner wall of the flow passage.