Disc check valve UNJ

fuelfor oilthreaded

Short Description
UNJ-thread straight-thru check valve in aluminum alloy for aviation fuel and hydrocarbon oil systems. Automatic, spring-loaded disk design with 1.875 in UNJ threads (12 TPI, right-hand) and 37° flared tube seats. Rated 300 PSI (20.7 bar) and 160.0°F (71.1°C). Drop-in replacement for MS28884A12, suitable for horizontal or vertical installation in aircraft fuel and oil circuits.

Parameter Specification Table
Code | Parameter Item | Parameter Value
AAJF | Thread Direction | Right-hand all ends
ADQU | Flow Control Device | DISK
ADSU | Disk Loading Method | Spring
AEHZ | Maximum Operating Temp | 160.0 deg fahrenheit (71.1°C)
AHNC | Connection Style | Flared (tube) all ends (37° seat)
AQLR | Valve Operation Method | Automatic
AWLS | Connection Type | Threaded external tube all ends
BBJX | Mounting Position | Horizontal or vertical
CMLP | Thread Quantity per Inch | 12 all ends (12 TPI)
CQGM | Maximum Operating Pressure | 300.0 pounds per square inch (20.7 bar)
CQJX | Nominal Thread Size | 1.875 in all ends (47.63 mm)
CQRB | Seat Angle | 37.0 degrees all ends
MATT | Material | Aluminum alloy overall
MEDA | Media for Which Designed | Fuel/oil, hydrocarbon
STYL | Style Designator | Straight thru
THSD | Thread Series Designator | UNJ all ends

Product Details
Designed for aircraft fuel and hydrocarbon oil systems, this automatic UNJ threaded check valve provides one-way flow control via a spring-loaded disk. Flared tube connections with 37° seats and 1.875 in UNJ threads allow direct replacement of MS28884A12. The aluminum alloy body offers weight advantages for aerospace installations while maintaining compatibility with fuel/oil media. Rated for 300 PSI and 160.0°F, it supports both horizontal and vertical mounting orientations.

Technical features / specifications

• Thread Direction: Right-hand all ends
• Flow Control Device: DISK
• Disk Loading Method: Spring
• Maximum Operating Temp: 160.0 deg fahrenheit (71.1°C)
• Connection Style: Flared (tube) all ends (37° seat)
• Valve Operation Method: Automatic
• Connection Type: Threaded external tube all ends
• Mounting Position: Horizontal or vertical
• Thread Quantity per Inch: 12 all ends (12 TPI)
• Maximum Operating Pressure: 300.0 pounds per square inch (20.7 bar)
• Nominal Thread Size: 1.875 in all ends (47.63 mm)
• Seat Angle: 37.0 degrees all ends
• Material: Aluminum alloy overall
• Media for Which Designed: Fuel/oil, hydrocarbon
• Style Designator: Straight thru
• Thread Series Designator: UNJ all ends