Fuel tank vent check valves regulate pressure by allowing air to enter or exit the tank while preventing fuel spillage. They ensure proper venting to avoid vacuum or overpressure conditions in the fuel system. These valves are critical for maintaining safe and efficient fuel storage and delivery.

Size: Typically ranges from 1/4" to 1" in diameter, depending on application.

Grade: ASTM B62, ASTM B584, or SAE J514 standards for material compliance.

Viscosity: Compatible with fuels ranging from 1.5 cSt (kerosene) to 4.5 cSt (diesel).

Buoyancy: Float mechanism designed for specific gravity of 0.7–0.9 (aviation fuel) or 0.82–0.95 (automotive fuel).

Material: Brass, aluminum, or stainless steel for corrosion resistance; nitrile or Viton seals.

Operating Pressure: 3–15 psi (20–100 kPa) depending on valve type.

Temperature Range: -40°F to +250°F (-40°C to +121°C) for standard applications.

Flow Rate: 5–30 SCFM (standard cubic feet per minute) for venting efficiency.

Leakage Rate: <0.1 cc/min under rated pressure for airtight sealing.

Mounting: Threaded (NPT, BSP) or flange connections for secure installation.

Fuel Tank Vent Check Valves and Fuel Systems may comply with maritime standards such as ISO 15540, ISO 15370, or IMO MSC.1/Circ.1361, depending on the specific product and manufacturer. Always verify with the supplier for exact compliance.