The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-437-6718, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 8 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 | 4820-01-437-6718 |
| Primary Part Number | 518145 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Flow Control Device | PISTON, FREE TYPE |
| Second End Relationship with First End | IDENTICAL |
| Material Document and Classification | AMS 5354 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | AMS 5354 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| End Connection Quantity | 2 |
| Material | STEEL UNS J91631 BODY |
| Material | STEEL UNS J91631 SEAT |
| Media for Which Designed | AIR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 518145 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
NSN 4820-01-437-6718 is a Valve,relief,pressure and Temper, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-437-6718 has 1 manufacturer part number on file: 518145 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 518145: Flow Control Device: PISTON, FREE TYPE; Second End Relationship with First End: IDENTICAL; Material Document and Classification: AMS 5354 ASSN STD SINGLE MATERIAL RESPONSE BODY; Material Document and Classification: AMS 5354 ASSN STD SINGLE MATERIAL RESPONSE SEAT. 8 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.
NSN 4820-01-437-6718 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.