The Valve,check, cataloged under National Stock Number 4820-01-370-1865, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Pall Aeropower Corporation. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-370-1865 |
| Primary Part Number | AC-B741-24D671 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Pall Aeropower Corporation |
| Status | ACTIVE |
| Operating Pressure | 4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 275.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Valve Operation Method | AUTOMATIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AC-B741-24D671 PRIMARY | Pall Aeropower Corporation (USA) |
| Reference | Meaning |
|---|---|
| DAA3252P066-227 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
NSN 4820-01-370-1865 is a Valve,check, manufactured by Pall Aeropower Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-370-1865 has 1 manufacturer part number on file: AC-B741-24D671 (Pall Aeropower Corporation).
Key specifications for AC-B741-24D671: Operating Pressure: 4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: 275.0 FAHRENHEIT SINGLE RESPONSE DEGF; Special Features: DIMENSIONS: 3.195 IN.; INSIDE DIAMETER 1.730 IN.; SYSTEM PRESSURE; PROOF: 6000 PSIG,BURST 10,000 PSIG; NHA P/N AZ-B741-241,CAGEC 18350,FSC 1650; INTERNAL LEAKAGE: 8 DROPS/MIN AT 5 PSI AND 2 DROPS AT 1000 PSI; PRES- SURE DROP AT RATED FLOW: 10 PSI MAX AT 826 PM AND 100 DEG F; PART PER PSI 10035020 ROSAN; INSTALLATION TORQUE: 140 TO 200 IN. LBS IN; End Item Identification: PACER SPECIAL. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.