The Valve,safety Relief, cataloged under National Stock Number 4820-01-646-3618, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-646-3618 |
| Primary Part Number | 81PS1F68-8/1320 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| Status | ACTIVE |
| Style Designator | ANGLE W/OFFSET |
| Operating Pressure | 6.3 KILOGRAMS PER SQUARE CENTIMETER NOMINAL POWER DRIVE KG |
| Bonnet Type | INSIDE SPRING |
| Bonnet Attachment Method | THREADED |
| Material | PLASTIC POLYPROPYLENE SEAT |
| Valve Operation Method | AIR |
| 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 |
|---|---|
| 81PS1F68-8/1320 PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 3/4 X 1IN NPT F&F,1320PSIG,CS | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
NSN 4820-01-646-3618 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-646-3618 has 2 manufacturer part numbers on file: 81PS1F68-8/1320 (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 3/4 X 1IN NPT F&F,1320PSIG,CS (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 81PS1F68-8/1320: Style Designator: ANGLE W/OFFSET; Operating Pressure: 6.3 KILOGRAMS PER SQUARE CENTIMETER NOMINAL POWER DRIVE KG; Bonnet Type: INSIDE SPRING; Bonnet Attachment Method: THREADED. 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.