The Valve,check, cataloged under National Stock Number 4820-00-203-7173, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is The Walworth Company. Government technical data includes 30 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. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4820-00-203-7173 |
| Primary Part Number | 277-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | The Walworth Company |
| Status | CANCELLED |
| Material | NICKEL ALLOY SEAT |
| Nominal Thread Size | 1.000 INCHES ALL ENDS IN |
| Material | COPPER ALLOY 922 BODY |
| Style Designator | STRAIGHT THRU |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Maximum Operating Temp | 550.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Flow Control Device | DISK |
| Valve Operation Method | AUTOMATIC |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Renewable Seat Ring Type | THREADED |
| Operating Pressure | 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Thread Series Designator | NPT ALL ENDS |
| Operating Pressure | 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Nominal Thread Size | 1.000 INCHES ALL ENDS IN |
| Material Document and Classification | QQ-C-390,ALLOY D4/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Style Designator | STRAIGHT THRU |
| Material | NICKEL ALLOY SEAT |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Material | NICKEL ALLOY FLOW CONTROL DEVICE |
| Mounting Position | HORIZONTAL |
| Nominal Pipe Size Accommodated | 1.000 INCHES FIRST END IN |
| Thread Series Designator | NPT ALL ENDS |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Maximum Operating Temp | 550.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Material Document and Classification | QQ-C-390,ALLOY D4/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 277-1 PRIMARY | The Walworth Company (USA) |
| 962A | Jenkins Bros (USA) |
| DS2161-1-1PC277-1 PRIMARY | The Walworth Company (USA) |
NSN 4820-00-203-7173 is a Valve,check, manufactured by The Walworth Company, classified under FSC 4820 (No Item Name Available). Status: cancelled.
NSN 4820-00-203-7173 has 3 cross-referenced part numbers: 277-1 (The Walworth Company), 962A (Jenkins Bros), DS2161-1-1PC277-1 (The Walworth Company).
There are 11 known substitutes for 4820-00-203-7173: 5310-00-276-8631, 2990-00-363-5995, 6160-00-488-4591 and 8 more. Verify interchangeability with system specifications before substitution.
Key specifications for 277-1: Material: NICKEL ALLOY SEAT; Nominal Thread Size: 1.000 INCHES ALL ENDS IN; Material: COPPER ALLOY 922 BODY; Style Designator: STRAIGHT THRU. 30 total characteristics are documented in the Federal Logistics Information System.
NSN 4820-00-203-7173 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.