The Valve,safety Relief, cataloged under National Stock Number 4820-00-287-3155, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Kennedy Valve Div of Itt Grinnell Valve Co Inc. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-287-3155 |
| Primary Part Number | 999SIZE1-4 200PSI |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Kennedy Valve Div of Itt Grinnell Valve Co Inc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Nominal Pipe Size Accommodated | 0.250 INCHES FIRST END IN |
| Connection Style | PLAIN (PIPE) FIRST END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Operating Pressure | 175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Features Provided | VALVE STEM LOCK SHIELD |
| Bonnet Type | INSIDE SPRING |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | THREADED |
| Media for Which Designed | AIR FIRST RESPONSE |
| Material | COPPER ALLOY BODY |
| Material | NICKEL ALLOY STEM |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY SEAT |
| Thread Series Designator | NPT FIRST END |
| Opening Pressure Setting | 200.0 POUNDS PER SQUARE INCH LBS |
| Valve Discharge Flow Rate | 60.0 CUBIC FEET PER MINUTE |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 999SIZE1-4 200PSI PRIMARY | Kennedy Valve Div of Itt Grinnell Valve Co Inc (USA) |
| 999SIZE1-4200PSI | Kennedy Valve Div of Itt Grinnell Valve Co Inc (USA) |
| 2AC10742 PRIMARY | Dresser Industries Inc Leroi Div (USA) |
NSN 4820-00-287-3155 is a Valve,safety Relief, manufactured by Kennedy Valve Div of Itt Grinnell Valve Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-287-3155 has 3 manufacturer part numbers on file: 999SIZE1-4 200PSI (Kennedy Valve Div of Itt Grinnell Valve Co Inc), 999SIZE1-4200PSI (Kennedy Valve Div of Itt Grinnell Valve Co Inc), 2AC10742 (Dresser Industries Inc Leroi Div).
Key specifications for 999SIZE1-4 200PSI: Flow Control Device: DISK; Nominal Pipe Size Accommodated: 0.250 INCHES FIRST END IN; Connection Style: PLAIN (PIPE) FIRST END; Connection Type: THREADED EXTERNAL PIPE FIRST END. 21 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.