Spaltklappen

Spaltklappen are a type of valve or damper used to regulate the flow of gases or liquids in ducts and channels by creating and adjusting a narrow gap, or spalt, between closing elements. The gap size is controlled to vary the effective flow cross-section and the resulting pressure loss, allowing throttling and balancing of flows without fully closing the passage.

Typically, a Spaltklappe consists of one or more plates or blades that can be rotated or translated relative to a fixed boundary to form a controllable slit. Actuation is provided by electric motors, pneumatic or hydraulic cylinders, often with position feedback for precise control. The design aims to minimize leakage when closed while providing accurate and repeatable control over a wide range of flow rates. Materials and seals are chosen for compatibility with the transported medium and the operating environment, including considerations for temperature, humidity, dust, or corrosive gases.

Spaltklappen are commonly used in heating, ventilation and air conditioning (HVAC) systems, cleanrooms, data centers, and process engineering, where precise, fast-responding flow control is required. They can serve for volume flow regulation, air mixing, or diversion in multi-branch duct networks. They may be preferred over full-area dampers in applications needing fine throttling with low aerodynamic losses.

Advantages of Spaltklappen include compact construction and good throttling characteristics; limitations include potential clogging from contaminants and the need for proper sealing and maintenance to prevent unwanted leakage or drift in position.