The Valve,safety Relief, cataloged under National Stock Number 4820-01-443-9866, 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 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-443-9866 |
| Primary Part Number | D559T1-8M-1 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Circor Aerospace, Inc. Dba Circor Aerospace Inc |
| Status | ACTIVE |
| Material | STEEL COMP 316 BODY |
| Connection Style | PLAIN (PIPE) FIRST END |
| Maximum Operating Temp | 250.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Style Designator | STRAIGHT THRU |
| Disk Loading Method | SPRING |
| Valve Operation Method | AUTOMATIC |
| Minimum Operating Temp | -40.0 FAHRENHEIT DEGF |
| Furnished Items and Quantity | 1 DEFLECTOR CAP |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Opening Pressure Setting | 1.0 POUNDS PER SQUARE INCH LBS |
| Thread Series Designator | NPT FIRST END |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 1.000 INCHES FIRST END IN |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 4875 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| D559T1-8M-1 PRIMARY | Circor Aerospace, Inc. Dba Circor Aerospace Inc (USA) |
| 4875-G501 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 4870 ITEM 67 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 4875C-G501 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
NSN 4820-01-443-9866 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 4820-01-443-9866 has 5 cross-referenced part numbers: 4875 (Howell Laboratories Inc Dba Howell Laboratories Inc), D559T1-8M-1 (Circor Aerospace, Inc. Dba Circor Aerospace Inc), 4875-G501 (Howell Laboratories Inc Dba Howell Laboratories Inc), 4870 ITEM 67 (Howell Laboratories Inc Dba Howell Laboratories Inc), 4875C-G501 (Howell Laboratories Inc Dba Howell Laboratories Inc).
There are 12 known substitutes for 4820-01-443-9866: 5940-00-143-4780, 4320-00-585-7770, 5940-00-617-2430 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for D559T1-8M-1: Material: STEEL COMP 316 BODY; Connection Style: PLAIN (PIPE) FIRST END; Maximum Operating Temp: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF; Style Designator: STRAIGHT THRU. 15 total characteristics are documented in the Federal Logistics Information System.