The Valve,safety Relief, cataloged under National Stock Number 4820-01-266-1322, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 26 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-266-1322 |
| Primary Part Number | DS10H-SP,NMP1550 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 6.000 INCHES SECOND END IN |
| Bolt Circle Nominal Diameter | 3.875 INCHES FIRST END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES SECOND END IN |
| Bolt Hole Nominal Diameter | 0.625 INCHES FIRST END IN |
| Valve Size | 1.500 INCHES IN |
| Adjustable Pressure Range | +26.0 TO 33.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Second Connection Face to Centerline Distance | 5.125 INCHES IN |
| Nominal Outside Diameter | 5.000 INCHES FIRST END IN |
| Nominal Outside Diameter | 7.500 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 ALL ENDS |
| Bonnet Attachment Method | UNION |
| First Connection Face to Centerline Distance | 4.875 INCHES IN |
| Material | NICKEL ALLOY BODY |
| Raised Face Nominal Diameter | 2.875 INCHES FIRST END IN |
| Raised Face Nominal Diameter | 5.000 INCHES SECOND END IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.063 INCHES ALL ENDS IN |
| Nominal Thickness | 0.562 INCHES SECOND END IN |
| Nominal Thickness | 0.562 INCHES FIRST 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 |
|---|---|
| NMP155001S0026 | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| DS10H-SP,NMP1550 PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| NMP1550 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| NMP1550 OPTION-A 26T33PSI | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| NMP1550 | D/9 Drawing number reference only Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| DS10H-SP,NMP1550 OPT-A26T33PSI | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| NMP1550 OPTION-A 26T33PSI | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| DS10H-SP,NMP1550 OPT-A26T33PSI | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| DS10H-SP,NMP155 | C/1 Advisory reference — outside the item-of-supply concept Kunkle Industries Inc Lonergan Valve Div |
| NMP1550 OPTION-A | 5/9 Secondary reference Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
NSN 4820-01-266-1322 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-266-1322 has 2 manufacturer part numbers on file: NMP155001S0026 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), DS10H-SP,NMP1550 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-267-0659. Verify interchangeability with system specifications before substitution.
Key specifications for DS10H-SP,NMP1550: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 6.000 INCHES SECOND END IN. 26 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.