The Valve,safety Relief, cataloged under National Stock Number 4820-01-284-4245, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-284-4245 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Furnished Items and Quantity | 1 HANDWHEEL |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 3.875 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 | 1.250 INCHES IN |
| Adjustable Pressure Range | +30.0 TO 100.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | INSIDE SCREW |
| Second Connection Face to Centerline Distance | 3.750 INCHES IN |
| Nominal Outside Diameter | 5.250 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| Bonnet Attachment Method | THREADED |
| First Connection Face to Centerline Distance | 3.750 INCHES IN |
| Material | STEEL CORROSION RESISTING BODY |
| Raised Face Nominal Diameter | 2.500 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Nominal Thickness | 0.750 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 |
| Reference | Meaning |
|---|---|
| HVSF-6R 30T100PSI | 3/9 Design control — primary reference Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co. |
| HV-3270 AND HVSF-6R 30T100PSI | 5/9 Secondary reference Ruthman Pump and Engineering Inc Dba Fulflo Specialties Co Div Fulflo Specialties Co. |
NSN 4820-01-284-4245 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-284-4245: Flow Control Device: PISTON; Flange Shape: ROUND WITH HOLES ALL ENDS; Furnished Items and Quantity: 1 HANDWHEEL; Flange Face Design: RAISED STRAIGHT ALL ENDS. 21 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.