The Valve,safety Relief, cataloged under National Stock Number 4820-01-051-8215, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Circor Aerospace, Inc. Dba Circor Aerospace Inc. Government technical data includes 25 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-051-8215 |
| Primary Part Number | D559A-6D-50 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Circor Aerospace, Inc. Dba Circor Aerospace Inc |
| Status | ACTIVE |
| Media for Which Designed | FUEL/OIL, HYDROCARBON FOURTH RESPONSE |
| Disk Loading Method | SPRING |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEAT |
| Style Designator | STRAIGHT THRU W/BAFFLE |
| Connection Type | THREADED EXTERNAL TUBE FIRST END |
| Flow Control Device | POPPET |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | AIR FIRST RESPONSE |
| Valve Operation Method | AUTOMATIC |
| Adjustable Pressure Range | +25.0 TO 75.0 POUNDS PER SQUARE INCH LBS |
| Material | ALUMINUM ALLOY 2024 BODY |
| Thread Class | 3A FIRST END A |
| Media for Which Designed | ACETYLENE SECOND RESPONSE |
| Material Document and Classification | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Surface Treatment Document and Classification | MIL-A-8625A TYPE I MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED A |
| Furnished Items and Quantity | 1 DEFLECTOR CAP |
| Media for Which Designed | HELIUM FIFTH RESPONSE |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST END |
| Opening Pressure Setting | 50.0 POUNDS PER SQUARE INCH LBS |
| Nominal Thread Size | 0.563 INCHES FIRST END IN |
| Media for Which Designed | AMMONIA, GASEOUS THIRD RESPONSE |
| Connection Style | PLAIN (TUBE) FIRST END |
| Thread Direction | RIGHT-HAND FIRST END |
| Surface Treatment | ANODIZE LOCATION NOT OTHERWISE SPECIFIED |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| D559A-6D-50 | Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA) |
| 3978 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 3978-5-50 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
NSN 4820-01-051-8215 is a Valve,safety Relief, manufactured by Circor Aerospace, Inc. Dba Circor Aerospace Inc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-051-8215 has 3 cross-referenced part numbers: D559A-6D-50 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), 3978 (Howell Laboratories Inc Dba Howell Laboratories Inc), 3978-5-50 (Howell Laboratories Inc Dba Howell Laboratories Inc).
There are 7 known substitutes for 4820-01-051-8215: 6210-00-243-0066, 5950-00-802-3345, 6520-01-180-3242 and 4 more. Verify interchangeability with system specifications before substitution.
Key specifications for D559A-6D-50: Media for Which Designed: FUEL/OIL, HYDROCARBON FOURTH RESPONSE; Disk Loading Method: SPRING; Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEAT; Style Designator: STRAIGHT THRU W/BAFFLE. 25 total characteristics are documented in the Federal Logistics Information System.