The Valve,check, cataloged under National Stock Number 4820-01-077-1988, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Hammond Valve Corp. Government technical data includes 16 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-077-1988 |
| Primary Part Number | 904-1-2 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Hammond Valve Corp |
| Status | ACTIVE |
| Maximum Operating Temp | 150.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Valve Operation Method | AUTOMATIC |
| Maximum Operating Temp | 353.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Flow Control Device | DISK |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Nominal Thread Size | 0.500 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Thread Series Designator | NPT ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | COPPER ALLOY OVERALL |
| Operating Pressure | 125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 904-1-2 | Hammond Valve Corp (USA) |
| 901-1/2IN. | Hammond Valve Corp (USA) |
| 901-1-2 | Hammond Valve Corp (USA) |
NSN 4820-01-077-1988 is a Valve,check, manufactured by Hammond Valve Corp, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-01-077-1988 has 3 cross-referenced part numbers: 904-1-2 (Hammond Valve Corp), 901-1/2IN. (Hammond Valve Corp), 901-1-2 (Hammond Valve Corp).
There are 8 known substitutes for 4820-01-077-1988: 3110-00-103-6259, 9340-00-230-4302, 4730-00-289-5280 and 5 more. Verify interchangeability with system specifications before substitution.
Key specifications for 904-1-2: Maximum Operating Temp: 150.0 FAHRENHEIT SECOND RESPONSE DEGF; Valve Operation Method: AUTOMATIC; Maximum Operating Temp: 353.0 FAHRENHEIT FIRST RESPONSE DEGF; Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS. 16 total characteristics are documented in the Federal Logistics Information System.