Core Structure Determines Operational Mode
The air extraction check valve acts like a diligent traffic officer, utilizing clever design to ensure unidirectional airflow:
Disc Structure: Features a movable baffle made of lightweight alloy or engineering plastic; when driven by airflow, it rotates open much like a door.
Reset Mechanism: Incorporates a built-in spring or counterweight; it closes automatically in the absence of airflow, preventing backflow of the medium.
Sealing Interface: Employs a beveled design paired with a rubber sealing ring, creating an airtight barrier when closed.
The Interplay of Airflow and Mechanics
When the system is in operation, the valve orchestrates a precise physical interplay:
Forward Flow: A pressure differential drives the valve disc to rotate 60–80 degrees, creating an unobstructed passage.
Flow Rate Sensitivity: Airflow speeds exceeding 2 m/s can fully overcome the reset resistance, achieving an opening degree of 90%.
Reverse Shutoff: When pressure reverses, the valve disc closes rapidly within 0.3 seconds, limiting leakage to less than 3%.
Practical Tips for Selection and Usage
Adhering to these best practices can extend the valve's service life:
Installation Angle: Valves installed in horizontal pipelines typically enjoy a 30% longer service life compared to those in vertical pipelines.
Maintenance Cycle: Inspect the spring tension for signs of decay every 2,000 hours of operation.
Medium Compatibility: For airflow containing particulate matter, it is recommended to select models equipped with a self-cleaning scraper.
Pressure Matching: The operating pressure should be maintained within the range of 30% to 80% of the valve's nominal pressure rating.