The Valve,safety Relief, cataloged under National Stock Number 4820-01-283-7155, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 24 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-283-7155 |
| Primary Part Number | R10AE9E920-CS1 AND D50937 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 3.250 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Valve Size | 0.750 INCHES IN |
| Adjustable Pressure Range | +272.0 TO 300.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SCREW |
| Second Connection Face to Centerline Distance | 3.688 INCHES IN |
| Nominal Outside Diameter | 4.625 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| First Connection Face to Centerline Distance | 3.688 INCHES IN |
| Material | STEEL BODY |
| Material | STEEL COMP 303 STEM |
| Material | STEEL COMP 304 SEAT |
| Material | STEEL COMP 304 FLOW CONTROL DEVICE |
| Raised Face Nominal Diameter | 1.688 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.250 INCHES ALL ENDS IN |
| Nominal Thickness | 0.625 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 |
|---|---|
| R10AE9E920-CS1 AND D50937 PRIMARY | Hunt Valve Company, Inc. (USA) |
| D50937 ASSEMBLY R10AE9E920-CS1 | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| D50937 ASSEMBLY R10AE9E920-CS1 | 5/9 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| R10AE9E920-CS1 AND D50937 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-283-7155 is a Valve,safety Relief, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-283-7155 has 2 manufacturer part numbers on file: R10AE9E920-CS1 AND D50937 (Hunt Valve Company, Inc.), D50937 ASSEMBLY R10AE9E920-CS1 (Hunt Valve Company, Inc.).
Key specifications for R10AE9E920-CS1 AND D50937: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 3.250 INCHES ALL ENDS IN. 24 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.