The Valve,check, cataloged under National Stock Number 4820-00-618-7821, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-618-7821 |
| Primary Part Number | 518471 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Hamilton Sundstrand Corporation Dba Collins Aerospace |
| Status | ACTIVE |
| Valve Operation Method | AUTOMATIC |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Thread Direction | RIGHT-HAND FIRST END |
| Operating Pressure | 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Seat Angle | 37.0 DEGREES FIRST END |
| Surface Treatment | ANODIZE |
| Material | ALUMINUM ALLOY 2024 BODY |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Surface Treatment Document and Classification | MIL-A-8625,TY 1 MIL SPEC SINGLE TREATMENT RESPONSE |
| Material Document and Classification | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Style Designator | STRAIGHT THRU |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Connection Style | EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END |
| Disk Loading Method | SPRING |
| Flow Control Device | POPPET |
| Thread Class | 3A FIRST END A |
| Maximum Operating Temp | 480.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Connection Type | THREADED EXTERNAL BOSS FIRST END |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-618-7821 is a Valve,check, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-618-7821 has 2 cross-referenced part numbers: 824A4TT4 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), 518471 (Hamilton Sundstrand Corporation Dba Collins Aerospace).
There is 1 known substitute for 4820-00-618-7821: 5961-00-409-5616. Verify interchangeability with system specifications before substitution.
Key specifications for 518471: Valve Operation Method: AUTOMATIC; Mounting Position: HORIZONTAL OR VERTICAL; Thread Direction: RIGHT-HAND FIRST END; Operating Pressure: 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 19 total characteristics are documented in the Federal Logistics Information System.