The Valve,safety Relief, cataloged under National Stock Number 4820-00-814-1957, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Richards R W Co. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-814-1957 |
| Primary Part Number | 1535-1SIZE1 1-2 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Richards R W Co |
| Status | ACTIVE |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Connection Style | PLAIN,OPTIONAL END(PIPE) ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| Style Designator | ANGLE |
| Media for Which Designed | WATER-OIL-GAS SINGLE RESPONSE |
| Thread Series Designator | NPT ALL ENDS |
| Valve Discharge Flow Rate | 314.0 GALLONS PER MINUTE |
| Operating Pressure | 4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Opening Pressure Setting | 750.0 POUNDS PER SQUARE INCH LBS |
| Material | COPPER ALLOY OVERALL |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Nominal Thread Size | 1.500 INCHES ALL ENDS IN |
| Thread Quantity Per Inch | 11-1/2 ALL ENDS |
| Bonnet Type | INSIDE SPRING |
| Bonnet Attachment Method | THREADED |
| Flow Control Device | DISK |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 1535-1SIZE1 1-2 | Richards R W Co (USA) |
| 1535-1 | Ashcroft Inc Dba Heise (USA) |
NSN 4820-00-814-1957 is a Valve,safety Relief, manufactured by Richards R W Co, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-814-1957 has 2 cross-referenced part numbers: 1535-1SIZE1 1-2 (Richards R W Co), 1535-1 (Ashcroft Inc Dba Heise).
There are 9 known substitutes for 4820-00-814-1957: 4920-00-010-0596, 2920-00-350-4394, 4810-00-706-8004 and 6 more. Verify interchangeability with system specifications before substitution.
Key specifications for 1535-1SIZE1 1-2: Features Provided: PRESSURE TIGHT OUTLET SIDE; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Thread Direction: RIGHT-HAND ALL ENDS; Maximum Operating Temp: 200.0 FAHRENHEIT SINGLE RESPONSE DEGF. 20 total characteristics are documented in the Federal Logistics Information System.