The Valve,safety Relief, cataloged under National Stock Number 4820-01-127-3846, 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 25 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-127-3846 |
| Primary Part Number | 20242A91SS |
| 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 ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Material Document and Classification | ASTM A216,GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A276 TYPE 303 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Material Document and Classification | ASTM A351,GRADE CF8 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | ASTM A351,GRADE CF8 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 1.500 INCHES IN |
| Adjustable Pressure Range | +2.0 TO 13.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SPRING |
| Second Connection Face to Centerline Distance | 4.750 INCHES IN |
| Nominal Outside Diameter | 5.000 INCHES ALL ENDS IN |
| Bonnet Attachment Method | BOLTED |
| First Connection Face to Centerline Distance | 4.750 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL COMP 303 STEM |
| Material | STEEL SEAT |
| Material | STEEL FLOW CONTROL DEVICE |
| Raised Face Nominal Diameter | 2.875 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Nominal Thickness | 0.690 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 |
|---|---|
| 20242A91SS PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| 20242 | D/9 Drawing number reference only Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
| 20242A91SS | 5/9 Secondary reference Anderson Greenwood Lp Dba Anderson Greenwood Crosby |
NSN 4820-01-127-3846 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 4820-01-127-3846 has 1 manufacturer part number on file: 20242A91SS (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
8 possible matches (shared part number, not a government interchangeability claim): 5995-01-127-4591, 4820-01-127-6205, 4820-01-133-7960. Verify interchangeability with system specifications before substitution.
Key specifications for 20242A91SS: Flow Control Device: DISK; Flange Shape: ROUND ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Connection Type: FLANGE ALL ENDS. 25 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.