Why Valves are Important for Aircraft Systems

Aircraft systems rely on tightly controlled fluid movement to support a wide variety of functions, as even minor disruptions in flow direction can lead to performance degradation or localized component stress. To address these challenges, valve components that fall under designated National Stock Numbers (NSNs) are often implemented to manage pressure conditions and restrict reverse flow within critical circuits. In this blog, we will be specifically going over NSN 4820-01-035-0612, as well as examine where valve parts and similar items are commonly used in aircraft applications.

Products That Fall Under NSN 4820-01-035-0612

NSN 4820-01-035-0612 is listed under Federal Supply Class (FSC) 4820, a category that encompasses nonpowered valve-related items used in fluid-handling systems. Components within this class typically operate without external actuation, instead relying on system pressure to perform their intended roles within fluid circuits. As such, products that fall under the aforementioned NSN are components of a larger assembly, rather than a standalone flow-control device.

Manufactures Featuring NSN 4820-01-035-0612

As NSNs are not tied to a single manufacturer or proprietary design, multiple approved companies can produce interchangeable versions of the same item based on a shared set of technical characteristics. To support this interchangeability, manufacturers are required to meet defined engineering specifications, qualification standards, and approval criteria that govern how the item is produced and validated. Within FSC 4820, components can be found manufactured by companies like Parker Hannifin Corporation, Eaton Corporation, Crane Co., and others.

Where Are Products with NSN 4820-01-035-0612 Used in Aircraft Systems?

Components that fall under FSC 4820 are implemented across a range of aircraft systems to regulate fluid and gas movement in diverse applications, including:

• Hydraulic Isolation: Within hydraulic circuits, valve assemblies are often used to regulate fluid pathways, which can reduce the risk of reverse movement or pressure imbalances that could affect actuator performance.

• Fuel Flow Control: In fuel delivery systems, valve-based components can support consistent flow toward the engine while restricting backflow or pressure fluctuations that could interfere with combustion stability.

• Pneumatic Regulation: Across pneumatic and bleed air systems, nonpowered valve mechanisms and associated parts can manage airflow direction, supporting stable operation of environmental control subsystems.

• Lubrication Retention: Some valves have the capacity to retain oil within designated pathways after shutdown, reducing the likelihood of dry starts during subsequent operation.

Explore Our Vast Collection of Valve Components

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