The Valve,safety Relief, cataloged under National Stock Number 4820-01-677-7020, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Val-Matic Valve and Manufacturing Corporation. Government technical data includes 6 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 | 4820-01-677-7020 |
| Primary Part Number | SS-3899-M |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Val-Matic Valve and Manufacturing Corporation |
| Status | ACTIVE |
| Material Document and Classification | ASTM B164 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM B62 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE BODY |
| Material | BRONZE BODY |
| Material | RUBBER SYNTHETIC PACKING |
| Material | NICKEL ALLOY SEAT |
| 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 |
|---|---|
| SS-3899-M PRIMARY | Val-Matic Valve and Manufacturing Corporation (USA) |
NSN 4820-01-677-7020 is a Valve,safety Relief, manufactured by Val-Matic Valve and Manufacturing Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-677-7020 has 1 manufacturer part number on file: SS-3899-M (Val-Matic Valve and Manufacturing Corporation).
Key specifications for SS-3899-M: Material Document and Classification: ASTM B164 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE SEAT; Material Document and Classification: ASTM B62 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE BODY; Part Name Assigned by Controlling Agency: AIR RELEASE VALVE MODEL 38.25NNS; Material: BRONZE BODY. 6 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.