A one-way valve within a washing machine’s drainage system prevents wastewater from flowing back into the appliance after it has been pumped out. This component, typically located in the drain hose or standpipe, allows water to exit but blocks its return, ensuring proper drainage and preventing contamination or operational issues.
Preventing backflow safeguards the wash cycle’s hygiene by keeping potentially contaminated water from re-entering the drum. It also protects the appliance from damage caused by siphoning or overflowing. This relatively simple device plays a critical role in the reliable operation of modern washers. Its widespread adoption reflects its effectiveness in addressing drainage problems common in earlier washing machine models.