The Valve,safety Relief, cataloged under National Stock Number 4820-01-156-8240, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Flow Control Corporation Dba Sprague Products Div Curtiss-Wright Flow Controls. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-156-8240 |
| Primary Part Number | 75322-61 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Curtiss-Wright Flow Control Corporation Dba Sprague Products Div Curtiss-Wright Flow Controls |
| Status | ACTIVE |
| Flow Control Device | PISTON |
| Nominal Pipe Size Accommodated | 0.250 INCHES SECOND END IN |
| Connection Style | SOCKET SECOND END |
| Connection Style | SWIVEL NUT, FLARE(PIPE) FIRST END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Connection Type | UNTHREADED INTERNAL PIPE SECOND END |
| Style Designator | STRAIGHT THRU |
| Adjustable Pressure Range | +1500.0 TO 2500.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.500 INCHES FIRST END IN |
| Material | STEEL CORROSION RESISTING BODY |
| Thread Series Designator | NPT FIRST END |
| 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 |
|---|---|
| 75322-61 PRIMARY | Curtiss-Wright Flow Control Corporation Dba Sprague Products Div Curtiss-Wright Flow Controls (USA) |
| Reference | Meaning |
|---|---|
| 75322-6 | 5/9 Secondary reference U.S. Government activity |
| 75322-61 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-156-8240 is a Valve,safety Relief, manufactured by Curtiss-Wright Flow Control Corporation Dba Sprague Products Div Curtiss-Wright Flow Controls, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-156-8240 has 1 manufacturer part number on file: 75322-61 (Curtiss-Wright Flow Control Corporation Dba Sprague Products Div Curtiss-Wright Flow Controls).
Key specifications for 75322-61: Flow Control Device: PISTON; Nominal Pipe Size Accommodated: 0.250 INCHES SECOND END IN; Connection Style: SOCKET SECOND END; Connection Style: SWIVEL NUT, FLARE(PIPE) FIRST END. 13 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.