A pulp stopper is a device used in the pulp preparation process to prevent the slurry from flowing unnecessarily from one area to another or to regulate the flow of pulp. The function of the pulp stopper is to control the flow of the slurry, ensuring a smooth production process while avoiding issues such as equipment damage and environmental contamination caused by the slurry.

There are various types of pulp stoppers, including mechanical pulp stoppers, pneumatic pulp stoppers, and hydraulic pulp stoppers. Among these, the mechanical pulp stopper is the simplest and most commonly used type. It features a straightforward structure, is easy to install and maintain, and offers high reliability and stability. A mechanical pulp stopper typically consists of components such as a sealing ring, a stopper plate, a protective cover, and a base. Its working principle relies on the friction and elastic deformation between the sealing ring and the stopper plate to create a certain pressure difference between the stopper plate and the inner wall of the pipeline, thereby achieving the purpose of stopping the slurry.