The Valve,safety Relief, cataloged under National Stock Number 4820-01-442-9403, 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 28 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-442-9403 |
| Primary Part Number | D-50DS120-JS0473 |
| 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 ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 4.750 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 3.500 INCHES SECOND END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Material Document and Classification | ASME SA216, GR WCB ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A564, GR 630 17.4PH ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | ASTM A582, TY 416 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Valve Size | 2.000 INCHES IN |
| Bonnet Type | INSIDE SPRING |
| Second Connection Face to Centerline Distance | 4.130 INCHES IN |
| Nominal Outside Diameter | 6.000 INCHES FIRST END IN |
| Nominal Outside Diameter | 4.880 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 ALL ENDS |
| Bonnet Attachment Method | BOLTED |
| First Connection Face to Centerline Distance | 4.500 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL COMP 416 STEM |
| Material | STEEL COMP 630 FLOW CONTROL DEVICE |
| Raised Face Nominal Diameter | 3.620 INCHES FIRST END IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES FIRST END IN |
| Nominal Thickness | 0.690 INCHES SECOND END IN |
| Nominal Thickness | 0.750 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 |
|---|---|
| D-50DS120-JS0473 PRIMARY | Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA) |
| Reference | Meaning |
|---|---|
| D-50DS120-JS0473 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
NSN 4820-01-442-9403 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-442-9403 has 1 manufacturer part number on file: D-50DS120-JS0473 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
Key specifications for D-50DS120-JS0473: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 4.750 INCHES FIRST END IN. 28 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.