The Valve,safety Relief, cataloged under National Stock Number 4820-01-188-1779, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Indal Technologies Inc. Government technical data includes 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-188-1779 |
| Primary Part Number | 6532C414-1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Indal Technologies Inc |
| Status | ACTIVE |
| Flow Control Device | POPPETPOPPET |
| Connection Style | GASKET SEAL(BOSS) ALL ENDS |
| Connection Type | THREADED INTERNAL BOSS ALL ENDS |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS. |
| Nominal Outside Diameter Tube Accommodated | 4.000 INCHES FIRST END IN |
| Adjustable Pressure Range | +3000.0 TO 3600.0 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND FIRST ENDRIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Maximum Operating Temp | -40.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 250.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Thread Class | 3B ALL ENDS3B ALL ENDS |
| Material | ALUMINUM ALLOY BODY |
| Thread Series Designator | UNF 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 |
|---|---|
| 6532C414-1 | Indal Technologies Inc (CAN) |
| Reference | Meaning |
|---|---|
| 665-13-4D2 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Valve Division |
| 1-1587-1 | 3/9 Design control — primary reference U.S. Government activity |
| 6532C414-1 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 665-13-4D2 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-188-1779 is a Valve,safety Relief, manufactured by Indal Technologies Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-188-1779 has 1 manufacturer part number on file: 6532C414-1 (Indal Technologies Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4710-01-354-5643, 4920-01-407-5458. Verify interchangeability with system specifications before substitution.
Key specifications for 6532C414-1: Flow Control Device: POPPETPOPPET; Connection Style: GASKET SEAL(BOSS) ALL ENDS; Connection Type: THREADED INTERNAL BOSS ALL ENDS; Style Designator: STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF SEPARABLE SECTIONS.. 14 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.