Dampers and valves are critical components within exhaust systems that control the flow, pressure, and direction of exhaust gases. Dampers typically function as adjustable louvers or blades to modulate airflow, while valves provide on/off isolation or directional control. They work together to manage system performance, energy efficiency, and safety by preventing backflow, balancing pressure, and directing emissions to appropriate treatment or discharge points. These components are available in various configurations and materials, including stainless steel, carbon steel, and aluminum alloys, to suit different operating environments. Key parameters for selection include nominal diameter (DN50–DN600 per ISO 6708), operating pressure (1.0–1.6 MPa), operating temperature (-40 to 85°C), leakage rate (0.01–0.1% per ISO 5208), actuation torque (50–500 N·m), response time (2–10 s), control signal (4–20 mA per IEC 60381), supply voltage (24 V DC ±10%), IP rating (IP54–IP65 per IEC 60529), body material (WCB or CF8M per ASTM A216/A351), seat material (PTFE or RPTFE per ASTM D3294), and weight (15–60 kg). These values are reference ranges and must be verified for the specific model and application. Dampers and valves are actuated manually, electrically, or pneumatically, depending on system requirements. Proper selection and maintenance are essential to ensure reliable operation, prevent leakage, and maintain system efficiency. Always consult the legal manufacturer or supplier to confirm model-specific values and compliance with applicable standards.
Dampers operate by rotating blades or louvers to increase or decrease the open cross-sectional area, thereby controlling airflow resistance. Valves use various mechanisms (butterfly, gate, ball) to completely open, close, or partially obstruct the flow path. Both are typically actuated manually, electrically, or pneumatically based on system requirements. The actuation torque and response time are critical for proper operation, and the control signal (4–20 mA) is used for analog control. The leakage rate indicates the sealing performance, and the IP rating defines protection against dust and water. The body and seat materials determine chemical resistance and friction characteristics. These components must be selected based on the specific process conditions, including pressure, temperature, and media compatibility.
