The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-253-6686, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Engineered Controls International, Llc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Engineered Controls International, Llc (CAGE 2Y894) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-253-6686 |
| Primary Part Number | PRV250B-135 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Engineered Controls International, Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| PRV250B-135 PRIMARY | Engineered Controls International, Llc (USA) |
| 8431394 PRIMARY | Engineered Controls International, Llc (USA) |
| Reference | Meaning |
|---|---|
| PRV9432F135B | 3/9 Design control — primary reference U.S. Government activity |
| NRV250B-135B | 5/9 Secondary reference Rego Co a Marmon Group Co |
| PRV250B-135 | 5/9 Secondary reference U.S. Government activity |
| 8431394 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4820-01-253-6686 is a Valve,relief,pressure and Temper, manufactured by Engineered Controls International, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-253-6686 has 2 manufacturer part numbers on file: PRV250B-135 (Engineered Controls International, Llc), 8431394 (Engineered Controls International, Llc).
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.