Stainless steel vent plug/Plastic vent plug/Aluminum alloy vent plug

II. Core Working Principle

Its working principle is mainly based on two key components:

1. Waterproof Breathable Membrane (PTFE/ePTFE membrane):
    This is the core of the technology. This membrane contains tens of thousands of micropores (pore sizes typically between 0.1-10 micrometers).
    The size of these micropores allows gas molecules (small in volume) to pass through smoothly but blocks liquid water molecules (due to surface tension, water molecules coalesce into larger droplets) and dust particles.

2. Vent Valve Housing and Structure:
    The housing provides robust mechanical protection for the fragile breathable membrane, enabling it to withstand installation torque, impact, vibration, and external physical damage.
    The interior of the housing is usually designed with air chambers and channels to optimize airflow and protect the membrane from direct blockage.

III. Main Features and Advantages

1. Excellent Corrosion Resistance:
Stainless steel materials (e.g., 304, 316L) enable it to withstand harsh environments, including salt spray in coastal areas, chemical corrosion in industrial zones, etc., with a lifespan far exceeding that of plastic valves.
2. High Protection Rating:
Typically capable of providing protection levels up to IP67, IP68, or even IP69K, ensuring effective waterproofing and dustproofing even in deep water or under high-pressure washing.
3. Resistance to High and Low Temperatures, Pressure Difference:
High-quality stainless steel vent valves can operate within extreme temperature ranges (e.g., -40°C to +150°C or higher) and withstand high-pressure differences.
4. Durability and Reliability:
The sturdy stainless steel structure resists impact, vibration, and wear, ensuring the reliability of equipment throughout its entire lifecycle.
5. Maintaining Seal Integrity:
By balancing pressure, it reduces continuous stress on the main seals of equipment, preventing premature failure and thus maintaining the overall sealing integrity of the equipment long-term.