The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-226-8425, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-226-8425 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | BALL |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | IDENTICAL |
| Surface Treatment Document and Classification | MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE |
| Body Style | TEE GIVE "ADQM" "ADQN" AND "ADQP" ONLY IF FLANGED ALL ENDS |
| First End Seat Angle in Deg | 45.0 |
| First End Thread Class | 3B |
| Third End Relationship with Preceding Ends | IDENTICAL WITH FIRST END |
| First End Style Designator | GASKET SEAL |
| Material Document and Classification | AISI 440C ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | FED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 416 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 51416 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| End Connection Quantity | 3 |
| Temp Control Device Type | FUSIBLE |
| First End Connection Type | THREADED INTERNAL TUBE |
| Temp Adjustability | NOT ADJUSTABLE |
| Surface Treatment | ANODIZE OUTSIDE |
| First End Outside Diameter Tube Accommodated | 0.375 INCHES NOMINAL IN |
| Material | STEEL COMP 440A FLOW CONTROL DEVICE A |
| Material | STEEL COMP 416 SEAT |
| Material | ALUMINUM ALLOY BODY |
| Media for Which Designed | HYDRAULIC FLUID, PHOSPHATE-ESTER BASE |
| Center to Center Distance | 0.900 INCHES NOMINAL IN |
| Valve Discharge Flow Rate | 1.2 GALLONS PER MINUTE |
| 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 |
| Reference | Meaning |
|---|---|
| A02HS132-6 | 7/2 Vendor item drawing reference The Boeing Company |
| 3A012-6 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-226-8425 is a Valve,relief,pressure and Temper, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-226-8425: Flow Control Device: BALL; First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: IDENTICAL; Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE. 23 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 4820-01-226-8425 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.