The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-198-4203, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-198-4203 |
| Primary Part Number | 5189443 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Flow Control Device | DISK, FLAT |
| First End Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| First End Thread Direction | RIGHT-HAND |
| Temp Rating | 125.0 FAHRENHEIT DEGF |
| Second End Nominal Thread Size | 0.750 INCHES IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Second End Thread Class | 3A A |
| Body Style | STRAIGHT THRU |
| Face to Face Distance | 2.890 INCHES NOMINAL IN |
| First End Thread Class | 3B |
| First End Style Designator | SWIVEL NUT, GASKET SEAL |
| Second End Thread Series Designator | UNIFIED NATIONAL JOINT (UNJ) |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 316 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 30316 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 316 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 30316 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 316 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 30316 ASSN STD SINGLE MATERIAL RESPONSE STEM |
| End Connection Quantity | 2 |
| Second End Thread Direction | RIGHT-HAND |
| Second End Style Designator | FLARED |
| Opening Pressure Setting | ERR-060 |
| Temp Control Device Type | THERMOSTATIC |
| First End Connection Type | THREADED INTERNAL BOSS |
| Temp Adjustability | NOT ADJUSTABLE |
| Material | STEEL COMP 316 BODY |
| Material | STEEL COMP 316 SEAT |
| Material | STEEL COMP 316 STEM |
| Media for Which Designed | HYDRAULIC FLUID, SILICATE-ESTER BASE |
| Second End Connection Type | THREADED EXTERNAL BOSS |
| Valve Discharge Flow Rate | 10.0 GALLONS PER MINUTE |
| First End Nominal Thread Size | 0.750 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-198-4203 is a Valve,relief,pressure and Temper, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-198-4203 has 2 manufacturer part numbers on file: 5189443 (Naval Sea Systems Command), H776A (Ausco Inc).
Key specifications for 5189443: Flow Control Device: DISK, FLAT; First End Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF); First End Thread Direction: RIGHT-HAND; Temp Rating: 125.0 FAHRENHEIT DEGF. 29 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.