The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-237-9451, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-237-9451 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | TEE GIVE "ADQL" AND "ADQM" ONLY WHEN FLANGED ALL ENDS |
| First End Style Designator | PLAIN |
| First Connection Face to Centerline Distance | 2.500 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-S-763, CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| End Connection Quantity | 2 |
| Second End Style Designator | SOCKET |
| Opening Pressure Setting | ERR-060 |
| First End Connection Type | UNTHREADED INTERNAL TUBE |
| Temp Adjustability | NOT ADJUSTABLE |
| Material | STEEL COMP 630 FLOW CONTROL DEVICE |
| Material | STEEL COMP 303 BODY |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Second End Connection Type | UNTHREADED INTERNAL TUBE |
| Adjustable Pressure Range | 125.0 TO 140.0 CAMERA MOUNT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| V3D10210-02 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-237-9451 is a Valve,relief,pressure and Temper, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-237-9451: Flow Control Device: POPPET; Second End Relationship with First End: NOT IDENTICAL; Body Style: TEE GIVE "ADQL" AND "ADQM" ONLY WHEN FLANGED ALL ENDS; First End Style Designator: PLAIN. 17 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.