How Does a Plastic Waterproof Breathable Valve Work - Wuxi Sinceriend New Material Technology Co., Ltd.

Core Mechanism

At the heart of the valve lies a breathable membrane, typically made of porous plastic materials with microscale pores. This membrane determines both the waterproof and air-permeable capabilities of the valve.
Breathable Process

The process begins with pressure difference between the inside and outside of the enclosed space. When internal pressure rises due to temperature changes or gas generation, air molecules easily pass through the micro pores. This outward airflow helps balance internal and external pressure, preventing damage to the enclosed structure.
Waterproof Function

Waterproofing relies on surface tension and pore size. Water molecules form larger clusters that cannot pass through the micro pores. The plastic housing is designed to guide water away from the membrane surface, preventing accumulation and seepage through potential gaps.
One-way Flow Design

Advanced valves incorporate a one-way flow design ensuring air only flows in the desired direction. This prevents external air carrying moisture from entering while still allowing internal air to exit, maintaining optimal conditions inside the enclosure.
Material Properties

The plastic material provides structural support and offers resistance to environmental factors like corrosion and aging. This ensures the valve maintains its performance over long-term use in various conditions.

How It Works: Membrane Filtration

The breathable membrane contains microscopic pores that allow air molecules (small blue dots) to pass through while blocking water clusters (larger blue circles).

Air pressure differential drives the process, with internal pressure pushing air molecules outward through the porous structure.

Surface tension causes water molecules to form clusters too large to penetrate the micro pores, creating an effective moisture barrier while maintaining breathability.

Pressure Equalization

Prevents damage from pressure buildup by allowing controlled air exchange between internal and external environments.

Selective Permeability

Micro pores sized to allow air molecules passage while blocking water clusters due to surface tension effects.

Directional Control

One-way valve design ensures moisture-laden external air cannot enter while allowing internal air to escape.

Long-term Durability

Corrosion-resistant plastic materials maintain performance in diverse environmental conditions over extended periods.