The Valve,check, cataloged under National Stock Number 4820-01-033-9665, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-033-9665 |
| Primary Part Number | 12253779-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 170.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | OIL, HYDRAULIC SINGLE RESPONSE |
| 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 |
|---|---|
| 12253779-1 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| DH-6535-30-06-02 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-033-9665 is a Valve,check, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-033-9665 has 1 manufacturer part number on file: 12253779-1 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12253779-1: Operating Pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: 170.0 FAHRENHEIT SINGLE RESPONSE DEGF; Special Features: HYDRAULIC SERVICE: OIL PER SPEC MIL-L-46167. FLUIDS AT 30 PLUS OR MINUS2 CENTISTOKES KINEMATIC VISCOSITY (138SUS) BETWEEN PLUS 100 DEG F AND PLUS 150 DEG F THAT ARE COMPATIBLE WITH VALVE COMPONENTS WILL BE USED FOR TEST PURPOSES; PROOF PRESSURE: 3000 PSI; BURSTPRESSURE; THIS VALVE SHALL WITHSTAND ABURST PRESSURE OF 4500 PSI WITHOUT FAILURE,RUPTURE,OR EXTERNAL LEAKAGE; FLOW; 20 GPM; CRACKING PRESSURE 2 PLUS OR MINUS 1 PSI; PRESSURE DROP IS NOT TOEXCEED 22 PSI AT 20 GPM; INTERNAL LEAKAGE IS NOT TO EXCEED 1CC/MIN AT 2000 PSI; NO EXTERNAL LEAKAGE PERMISSABLE; MATERIAL TO BE COMPATIBLE WITH OPERATING SPECIFICATIONS DEGF; Media for Which Designed: OIL, HYDRAULIC SINGLE RESPONSE. 4 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.