The Valve,safety Relief, cataloged under National Stock Number 4820-00-473-4249, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 20 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through both NSN and commercial part number lookups. 22 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-473-4249 |
| Primary Part Number | 88-D-244 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 2.125 INCHES SECOND END IN |
| Nominal Pipe Size Accommodated | 0.750 INCHES FIRST END IN |
| Connection Style | PLAIN,OPTIONAL END(PIPE) FIRST END |
| Connection Style | PLAIN (PIPE) SECOND END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED EXTERNAL PIPE SECOND END |
| Style Designator | ANGLE |
| Thread Direction | RIGHT-HAND SECOND END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 2.125 INCHES SECOND END IN |
| Nominal Thread Size | 0.750 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Thread Quantity Per Inch | 12 SECOND END |
| Thread Quantity Per Inch | 14 FIRST END |
| Material | STEEL BODY |
| Material | STEEL SEAT |
| Thread Series Designator | UN SECOND END |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 750.0 POUNDS PER SQUARE INCH LBS |
| Reference Number Differentiating Characteristics | ELR NO. |
| 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 |
|---|---|
| 88-D-244 | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 701-275PCV9 | 5/2 Secondary reference U.S. Government activity |
| 547-59P265PCRELIEFVALVE | 5/9 Secondary reference Cramp Shipbuilding and Drydock Co |
| 386694PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 759-475PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 759-285PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 417-2100-69215PCAE3L3M303P3S3Y3- | 3/1 Design control — primary reference U.S. Government activity |
| 386693CSPCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 765-417PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 765-228PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 490297PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 766-228PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 386693PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 547P201PCV9 | 5/9 Secondary reference Cramp Shipbuilding and Drydock Co |
| 386892PCV9 | 5/2 Secondary reference U.S. Government activity |
| 220-2100-1439645ALTCPCV7 | 5/2 Secondary reference U.S. Government activity |
| 759-417PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 475-2100-70774PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 386892CSPCV9 | 5/2 Secondary reference U.S. Government activity |
| 386691PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
| 386983ALT2PCRELIEFVALVE | 5/2 Secondary reference U.S. Government activity |
NSN 4820-00-473-4249 is a Valve,safety Relief, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-473-4249 has 1 manufacturer part number on file: 88-D-244 (Derbyshire Machine & Tool Co).
Key specifications for 88-D-244: Nominal Pipe Size Accommodated: 2.125 INCHES SECOND END IN; Nominal Pipe Size Accommodated: 0.750 INCHES FIRST END IN; Connection Style: PLAIN,OPTIONAL END(PIPE) FIRST END; Connection Style: PLAIN (PIPE) SECOND END. 20 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.