The Valve,safety Relief, cataloged under National Stock Number 4820-01-276-3399, 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 18 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-276-3399 |
| Primary Part Number | DX-30C 156TO186P |
| 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 | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 2.625 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.625 INCHES ALL ENDS IN |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.500 INCHES IN |
| Adjustable Pressure Range | +156.0 TO 186.0 POUNDS PER SQUARE INCH LBS |
| Second Connection Face to Centerline Distance | 3.250 INCHES IN |
| Nominal Outside Diameter | 3.750 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| First Connection Face to Centerline Distance | 3.312 INCHES IN |
| Material | STEEL BODY |
| Raised Face Nominal Diameter | 1.375 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.312 INCHES ALL ENDS 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 |
|---|---|
| DX-30C 156TO186P PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| DX-30C 156TO186PSI NMP-1521 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| NMP-1521 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| DX-30C 156TO186PSI NMP-1521 | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| NMP-1521 | D/9 Drawing number reference only Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-276-3399 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 4820-01-276-3399 has 1 manufacturer part number on file: DX-30C 156TO186P (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-283-9425, 4820-01-394-6226, 4820-01-395-0468. Verify interchangeability with system specifications before substitution.
Key specifications for DX-30C 156TO186P: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 2.625 INCHES ALL ENDS IN. 18 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.