The Valve,safety Relief, cataloged under National Stock Number 4820-01-406-6534, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Control Devices, Incorporated. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-406-6534 |
| Primary Part Number | SH25-165 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Control Devices, Incorporated |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Connection Style | PLAIN (SCREW-IN CARTRIDGE) FIRST END |
| Minimum Operating Temp | -65.0 FAHRENHEIT DEGF |
| Connection Type | THREADED CARTRIDGE FIRST END |
| Style Designator | SCREW-IN CARTRIDGE |
| Bonnet Type | INSIDE SCREW |
| Maximum Operating Temp | 350.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Mounting Facility | THREADED FASTENER |
| Bonnet Attachment Method | PRESSURE SEAL, RING TYPE |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY SEAT |
| Opening Pressure Setting | 165.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| SH25-165 PRIMARY | Control Devices, Incorporated (USA) |
| Reference | Meaning |
|---|---|
| SH25-165 | 5/9 Secondary reference Control Devices Inc |
NSN 4820-01-406-6534 is a Valve,safety Relief, manufactured by Control Devices, Incorporated, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-406-6534 has 1 manufacturer part number on file: SH25-165 (Control Devices, Incorporated).
Key specifications for SH25-165: Flow Control Device: BALL; Connection Style: PLAIN (SCREW-IN CARTRIDGE) FIRST END; Minimum Operating Temp: -65.0 FAHRENHEIT DEGF; Connection Type: THREADED CARTRIDGE FIRST END. 12 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.