The Valve,safety Relief, cataloged under National Stock Number 4820-01-227-1008, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hynautic Inc Div of Sta-Rite Industries Inc. Government technical data includes 12 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-227-1008 |
| Primary Part Number | MSV-21 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hynautic Inc Div of Sta-Rite Industries Inc |
| Status | ACTIVE |
| Connection Style | FLARE(TUBE) ALL ENDS |
| Connection Type | THREADED INTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| Nominal Outside Diameter Tube Accommodated | 0.312 INCHES ALL ENDS IN |
| Operating Pressure | 950.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Thread Class | 2B ALL ENDS |
| Thread Quantity Per Inch | 18 ALL ENDS |
| Material | ALUMINUM BODY |
| Thread Series Designator | UNS ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| MSV-21 PRIMARY | Hynautic Inc Div of Sta-Rite Industries Inc (USA) |
NSN 4820-01-227-1008 is a Valve,safety Relief, manufactured by Hynautic Inc Div of Sta-Rite Industries Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-227-1008 has 1 manufacturer part number on file: MSV-21 (Hynautic Inc Div of Sta-Rite Industries Inc).
Key specifications for MSV-21: Connection Style: FLARE(TUBE) ALL ENDS; Connection Type: THREADED INTERNAL TUBE ALL ENDS; Style Designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY.; Nominal Outside Diameter Tube Accommodated: 0.312 INCHES ALL ENDS IN. 12 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.