The Valve,safety Relief, cataloged under National Stock Number 4820-01-650-4220, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dixon Valve & Coupling Company, Llc Div Dixon Fire. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Dixon Valve & Coupling Company, Llc Div Dixon Fire (CAGE 72661); Defense Maritime Solutions, Inc. (CAGE 0EYA6) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-650-4220 |
| Primary Part Number | SV175SS |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Dixon Valve & Coupling Company, Llc Div Dixon Fire |
| Status | ACTIVE |
| 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 |
|---|---|
| SV175SS PRIMARY | Dixon Valve & Coupling Company, Llc Div Dixon Fire (USA) |
| WLP001455-002-41 | Defense Maritime Solutions, Inc. (USA) |
| Reference | Meaning |
|---|---|
| WLP001455-002 REV C PC NO 41 | C/1 Advisory reference — outside the item-of-supply concept Defense Maritime Solutions, Inc. |
| WLP001455-002 | D/9 Drawing number reference only Defense Maritime Solutions, Inc. |
NSN 4820-01-650-4220 is a Valve,safety Relief, manufactured by Dixon Valve & Coupling Company, Llc Div Dixon Fire, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-650-4220 has 2 manufacturer part numbers on file: SV175SS (Dixon Valve & Coupling Company, Llc Div Dixon Fire), WLP001455-002-41 (Defense Maritime Solutions, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-650-4268, 5330-01-673-6472. Verify interchangeability with system specifications before substitution.
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.