The Valve,safety Relief, cataloged under National Stock Number 4820-01-534-4757, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Keystone Intl Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-534-4757 |
| Primary Part Number | MOD 20 001 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Keystone Intl Inc |
| Status | ACTIVE |
| Style Designator | ANGLE |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 406.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Material | BRONZE BODY |
| 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 |
|---|---|
| MOD 20 001 PRIMARY | Keystone Intl Inc (USA) |
| Reference | Meaning |
|---|---|
| 330-J26-300 | D/9 Drawing number reference only Carrier Corp |
| MOD 20 001 | 5/9 Secondary reference Kunkle Industries Inc Lonergan Valve Div |
| 5240-1/2 IN | 5/9 Secondary reference Henry Technologies, Inc. |
NSN 4820-01-534-4757 is a Valve,safety Relief, manufactured by Keystone Intl Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-534-4757 has 1 manufacturer part number on file: MOD 20 001 (Keystone Intl Inc).
Key specifications for MOD 20 001: Style Designator: ANGLE; Operating Pressure: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: 406.0 FAHRENHEIT SINGLE RESPONSE DEGF; End Item Identification: CHILLER UNIT, 90HD08614. 5 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.