The Valve,safety Relief, cataloged under National Stock Number 4820-00-142-1014, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-00-142-1014 |
| Primary Part Number | A6814A |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES SECOND END |
| Renewable Seat Ring Type | THREADED |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Flange Face Design | RAISED STRAIGHT SECOND END |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Bolt Circle Nominal Diameter | 2.750 INCHES SECOND END IN |
| Style Designator | ANGLE |
| Bolt Hole Nominal Diameter | 0.500 INCHES SECOND END IN |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +31.0 TO 50.0 POUNDS PER SQUARE INCH LBS |
| Features Provided | BONNET PACKING |
| Bonnet Type | EXPOSED SPRING |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Nominal Outside Diameter | 3.875 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 SECOND END |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | WATER, FRESH SINGLE RESPONSE |
| Material | STEEL BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY SEAT |
| Thread Series Designator | NPT FIRST END |
| Raised Face Nominal Diameter | 1.688 INCHES SECOND END IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES SECOND END IN |
| Nominal Thickness | 0.438 INCHES SECOND END IN |
| 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 |
|---|---|
| A6814A PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| Reference | Meaning |
|---|---|
| 2250 | 3/1 Design control — primary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-00-142-1014 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-142-1014 has 1 manufacturer part number on file: A6814A (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
Key specifications for A6814A: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES SECOND END; Renewable Seat Ring Type: THREADED; Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN. 29 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.