Antidrainsbackväxlar

Antidrainsbackväxlar, often translated as anti-drainback valves or features, are common components in lubrication systems, particularly in engines and hydraulic machinery. Their primary function is to prevent the loss of oil or lubricant from the system when the equipment is shut down or at rest. This is achieved by holding a certain amount of oil within the system, such as in the oil filter or oil passages, thereby ensuring that lubrication is available immediately upon startup.

Without an antidrainsbackväxel, gravity would cause the oil to drain back into the sump or reservoir. This can lead to a period of dry running or insufficient lubrication during the initial moments of operation, which can cause increased wear and potential damage to critical components like bearings and camshafts. The antidrainsbackväxel, typically a simple flap or diaphragm, opens to allow oil flow during operation but closes when the system pressure drops, effectively creating a seal.

These valves are especially important in applications where the oil filter is mounted above the oil level in the sump, a common configuration in many automotive engines. By retaining oil in the filter and associated lines, the antidrainsbackväxel contributes to extended component life and improved system reliability. Their design is generally robust and integrated into the oil filter housing or inline within the lubrication circuit.