The Valve,safety Relief, cataloged under National Stock Number 4820-01-421-0134, 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 26 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-421-0134 |
| Primary Part Number | R10AJ2K213-BM1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 5.500 INCHES FIRST END IN |
| Bolt Circle Nominal Diameter | 4.750 INCHES SECOND END IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.750 INCHES ALL ENDS IN |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 2.500 INCHES IN |
| Adjustable Pressure Range | +72.0 TO 88.0 POUNDS PER SQUARE INCH LBS |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Second Connection Face to Centerline Distance | 5.375 INCHES IN |
| Nominal Outside Diameter | 7.000 INCHES FIRST END IN |
| Nominal Outside Diameter | 6.000 INCHES SECOND END IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 4 ALL ENDS |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| First Connection Face to Centerline Distance | 5.375 INCHES IN |
| Material | STEEL COMP 303 STEM |
| Material | NICKEL ALLOY R-405 FLOW CONTROL DEVICE |
| Material | NICKEL ALLOY 400 SEAT |
| Material | COPPER ALLOY 922 BODY |
| Material | COPPER ALLOY 464 PACKING |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.500 INCHES SECOND END IN |
| Nominal Thickness | 0.563 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 |
|---|---|
| R10AJ2K213-BM1 PRIMARY | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| R10AJ2K213-BM1 | 3/9 Design control — primary reference Hunt Valve Company Inc Dba Union Flonetics |
| D50002 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-421-0134 is a Valve,safety Relief, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-0134 has 1 manufacturer part number on file: R10AJ2K213-BM1 (Hunt Valve Company, Inc.).
Key specifications for R10AJ2K213-BM1: Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 5.500 INCHES FIRST END IN; Bolt Circle Nominal Diameter: 4.750 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.