The Valve,safety Relief, cataloged under National Stock Number 4820-00-595-1028, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ashcroft Inc Dba Heise. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-595-1028 |
| Primary Part Number | 1805CCU1-2-17T27SBU |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Connection Style | SOCKET FIRST END |
| Connection Type | UNTHREADED INTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +17.0 TO 27.0 POUNDS PER SQUARE INCH LBS |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Disk Loading Method | SPRING |
| Media for Which Designed | WATER, FRESH SINGLE RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY SEAT |
| Material | COPPER ALLOY STEM |
| 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 |
|---|---|
| 1805CCU1-2-17T27SBU PRIMARY | Ashcroft Inc Dba Heise (USA) |
NSN 4820-00-595-1028 is a Valve,safety Relief, manufactured by Ashcroft Inc Dba Heise, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-595-1028 has 1 manufacturer part number on file: 1805CCU1-2-17T27SBU (Ashcroft Inc Dba Heise).
Key specifications for 1805CCU1-2-17T27SBU: Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN; Connection Style: SOCKET FIRST END; Connection Type: UNTHREADED INTERNAL PIPE FIRST END; Style Designator: ANGLE. 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.