The Valve,check, cataloged under National Stock Number 4820-00-203-4521, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Aerocontrolex Group, Inc. Dba Aero Fluid Products. Government technical data includes 27 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-203-4521 |
| Primary Part Number | 4-2800 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Aerocontrolex Group, Inc. Dba Aero Fluid Products |
| Status | ACTIVE |
| Surface Treatment | ANODIZE |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Connection Type | THREADED EXTERNAL BOSS ALL ENDS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Maximum Operating Temp | 400.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Valve Operation Method | AUTOMATIC |
| Mounting Position | HORIZONTAL |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS |
| Thread Series Designator | UN ALL ENDS |
| Surface Treatment | ANODIZE |
| Material | ALUMINUM ALLOY OVERALL |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Operating Pressure | 192.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Series Designator | UN ALL ENDS |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Style Designator | STRAIGHT THRU |
| Nominal Thread Size | 1.062 INCHES ALL ENDS IN |
| Nominal Thread Size | 1.062 INCHES ALL ENDS IN |
| Operating Pressure | 192.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Material | ALUMINUM ALLOY OVERALL |
| Thread Quantity Per Inch | 12 ALL ENDS |
| Disk Loading Method | SPRING |
| Style Designator | STRAIGHT THRU |
| Flow Control Device | POPPET |
| Thread Class | 3A ALL ENDS A |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Seat Angle | 37.0 DEGREES ALL ENDS |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-203-4521 is a Valve,check, manufactured by Aerocontrolex Group, Inc. Dba Aero Fluid Products, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-203-4521 has 4 cross-referenced part numbers: 4-2800 (Aerocontrolex Group, Inc. Dba Aero Fluid Products), A4-2800 (Aerocontrolex Group, Inc. Dba Aero Fluid Products), 8-00282-1 (Raytheon Company), 8-00282-1 (Hughes Missile Systems Co San Diego).
There are 10 known substitutes for 4820-00-203-4521: 5325-00-202-4002, 5331-00-340-4415, 5950-00-647-3582 and 7 more. Verify interchangeability with system specifications before substitution.
Key specifications for 4-2800: Surface Treatment: ANODIZE; Thread Quantity Per Inch: 12 ALL ENDS; Connection Type: THREADED EXTERNAL BOSS ALL ENDS; Thread Direction: RIGHT-HAND ALL ENDS. 27 total characteristics are documented in the Federal Logistics Information System.