1. The valve body of the non-return valve assembly of the air compressor
Function: As the outer shell of the entire assembly, it accommodates the internal core components and connects the pipelines.
Material: Selected based on the working pressure and medium characteristics, common materials include cast iron (suitable for low-pressure conditions), cast steel (medium-high pressure), and stainless steel (for corrosive environments such as the food and pharmaceutical industries).
Structure: Usually in a straight-through or right-angle type, it has fluid channels inside to ensure smooth airflow passage.
2. The valve core (valve disc) of the non-return valve assembly of the air compressor
Function: Controls the direction of the airflow, allowing only one-way flow (from the air compressor outlet to the storage tank or downstream pipelines), and preventing reverse flow.
Common types:
Lift type valve core: Moves up and down along the valve body axis, has good sealing performance, suitable for small-diameter pipelines.
Swing type valve core: Opens by rotating around the hinge axis, has low resistance, suitable for high-flow, large-diameter scenarios.
Ball type valve core: Seals through the self-weight or spring force of the ball, has a simple structure and quick response.
Material: Mostly made of wear-resistant metals (such as brass, ductile iron), some high-precision scenarios use engineering plastics (such as polytetrafluoroethylene) to enhance sealing performance.
3. Sealing components of the non-return valve assembly of the air compressor
Function: Ensures the airtightness when the valve core is in contact with the valve seat, preventing leakage.
Common materials:
Nitrile Butadiene Rubber (NBR): Good oil resistance, suitable for ordinary air compressor systems.
Fluororubber (FKM): Resistant to high temperatures and chemical corrosion, suitable for high-temperature or special medium environments.
Metal sealing surface: Achieves sealing through the precision machined metal contact surfaces, suitable for high-pressure, high-temperature conditions.
4. Springs of the non-return valve assembly of the air compressor
Function: Provide rebound force to make the valve core tightly adhere to the valve seat when there is no forward airflow, achieving sealing.
Characteristics: The spring elasticity needs to match the system working pressure - too much elasticity will increase air flow resistance, too little may lead to poor sealing.
Material: Usually made of stainless steel to prevent rust and failure in humid or oily environments.
5. Valve seat of the non-return valve assembly of the air compressor
Function: Forms a sealing pair with the valve core, being the key contact surface to prevent reverse airflow.
Features: The surface needs to be precisely machined (such as polishing) to ensure the fit with the valve core, some valve seats can be replaced for easy maintenance.
6. Connection interfaces of the non-return valve assembly of the air compressor
Function: Connects the air compressor exhaust port with the downstream pipelines (such as storage tanks, dryers, etc.).
Common forms:
Threaded interfaces (internal thread / external thread): Such as G thread, NPT thread, suitable for small diameters (≤DN50).
Flange interfaces: Suitable for large-diameter pipelines, providing firm connection and strong sealing.
Welding interfaces: Suitable for high-pressure, high-vibration scenarios, requiring professional welding installation.
Core functions of the non-return valve assembly of the air compressor
Prevent backflow: Prevents the compressed air in the storage tank from flowing back to the air compressor main unit when it is stopped, avoiding reverse rotation of the main unit or lubricating oil being pushed into the cylinder.
Protect the system: Prevents condensate water or impurities from the downstream equipment (such as dryers, filters) from flowing back into the air compressor, reducing the risk of failure.
Maintain system pressure: Ensures the stability of the pressure in the storage tank after shutdown, avoiding frequent startup of the air compressor.
