The Valve,safety Relief, cataloged under National Stock Number 4820-01-695-1187, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Transaero, Inc.. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-695-1187 |
| Primary Part Number | 577A-12DB-12 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Transaero, Inc. |
| Status | ACTIVE |
| Connection Style | FLARED (TUBE) FIRST END |
| Minimum Operating Temp | -65.0 FAHRENHEIT DEGF |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.75 INCHES ALL ENDS IN |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH GAUGE (PSIG) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.75 INCHES IN |
| Nominal Thread Size | 1.0625 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Maximum Operating Temp | 275.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Class | 3A FIRST END A |
| Thread Quantity Per Inch | 12 FIRST END |
| Material | ALUMINUM ALLOY 2024 BODY |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR O-RING |
| Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) FIRST END |
| Opening Pressure Setting | 12.0 POUNDS PER SQUARE INCH GAGE LBS |
| 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 | V |
| Part Number | Manufacturer |
|---|---|
| 577A-12DB-12 | Transaero, Inc. (USA) |
| 577A-12DB-12 | Dela Technology Corporation Dba Dela Technology Corp (USA) |
| Reference | Meaning |
|---|---|
| 577A-12DB-12 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-01-695-1187 is a Valve,safety Relief, manufactured by Transaero, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-695-1187 has 2 manufacturer part numbers on file: 577A-12DB-12 (Transaero, Inc.), 577A-12DB-12 (Dela Technology Corporation Dba Dela Technology Corp).
Key specifications for 577A-12DB-12: Connection Style: FLARED (TUBE) FIRST END; Minimum Operating Temp: -65.0 FAHRENHEIT DEGF; Connection Type: THREADED EXTERNAL TUBE FIRST END; Style Designator: STRAIGHT THRU. 19 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.