The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-648-7812, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Spirax Sarco Inc Dba Spirax Sarco. Government technical data includes 13 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 | 4820-01-648-7812 |
| Primary Part Number | M40HI3 ISO(DN25,ASME300) |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Spirax Sarco Inc Dba Spirax Sarco |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Temp Rating | -29.0 CELSIUS AND 260.0 CELSIUS DEGC |
| Body Style | HIGH PRESSURE (FLANGED) |
| Face to Face Distance | 165.0 MILLIMETERS NOMINAL MM |
| Body Outside Diameter | 124.0 MILLIMETERS NOMINAL MM |
| Material Document and Classification | ASTM A351, GRADE CF8M 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 STEM |
| Opening Pressure Setting | 9.0 LOW VOLATILE ORGANIC COMPOUND - COATINGS - GRAPHIC ARTS COATINGS |
| Temp Control Device Type | FUSIBLE |
| Temp Adjustability | ADJUSTABLE |
| Material | STEEL COMP 316 STEM |
| Material | STEEL UNS J92900 BODY |
| Media for Which Designed | STEAM |
| 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 |
|---|---|
| M40HI3 ISO(DN25,ASME300) PRIMARY | Spirax Sarco Inc Dba Spirax Sarco (USA) |
NSN 4820-01-648-7812 is a Valve,relief,pressure and Temper, manufactured by Spirax Sarco Inc Dba Spirax Sarco, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-648-7812 has 1 manufacturer part number on file: M40HI3 ISO(DN25,ASME300) (Spirax Sarco Inc Dba Spirax Sarco).
Key specifications for M40HI3 ISO(DN25,ASME300): Flow Control Device: BALL; Temp Rating: -29.0 CELSIUS AND 260.0 CELSIUS DEGC; Body Style: HIGH PRESSURE (FLANGED); Face to Face Distance: 165.0 MILLIMETERS NOMINAL MM. 13 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.