Mono-Material Valve Assembly for Recyclable One-Way Fluid Flow

The plunger is designed as a mono-material component made entirely from polyethylene, merging what would traditionally be multiple materials (different plastics for the plunger body, seal portions, and spring) into a single material system. This allows the entire plunger to be recycled with the polyethylene bag without material separation complications, while maintaining functional integrity through integrated design of seal portions and spring mechanism within the same material.

The plunger and its components are constructed from homogeneous polyethylene material throughout, eliminating material heterogeneity that would complicate recycling. The seal portions and spring are all made from the same polyethylene, creating a uniform material composition that can be easily processed in existing polyethylene recycling streams alongside the bag material.

The plunger incorporates a dynamic spring mechanism made from polyethylene that automatically adjusts the plunger position based on operational conditions. The spring portion compresses and expands to maintain the plunger in different positions (first position for sealing, second position for fluid flow) without requiring external actuators or complex control systems, leveraging elastic deformation for position control.

The plunger design enables self-regulation of seal positions through the spring mechanism that automatically responds to pressure differentials and flow conditions. The spring compresses under pressure to allow fluid flow, then automatically returns to its original state to restore sealing, providing self-service position control without external intervention or complex mechanical linkages.

The spring mechanism is pre-configured to exert a restoring force that automatically counteracts any backflow tendency. When fluid flow stops or reverses, the spring's stored elastic energy immediately pushes the plunger back to the sealing position, preventing microbiological contamination from entering the bag. This preliminary anti-action is built into the spring's inherent elastic properties.

The design replaces complex mechanical backflow prevention mechanisms (such as check valves or mechanical locks) with a simpler spring-based elastic restoration system. The spring's natural tendency to return to its original shape provides automatic backflow prevention, eliminating the need for additional mechanical components that would increase device complexity and potential failure points.