The Valve,check, cataloged under National Stock Number 4820-00-772-2891, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Tactair Fluid Controls Inc. Government technical data includes 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-772-2891 |
| Primary Part Number | 2637-5 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Tactair Fluid Controls Inc |
| Status | ACTIVE |
| Nominal Thread Size | 0.548 INCHES SECOND END IN |
| Flow Control Device | POPPET |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Connection Style | FLARELESS ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Disk Loading Method | SPRING |
| Nominal Thread Size | 0.562 INCHES FIRST END IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Seat Angle | 12.0 DEGREES ALL ENDS |
| Surface Treatment | PASSIVATE |
| Media for Which Designed | OIL, HYDRAULIC SINGLE RESPONSE |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE |
| Style Designator | STRAIGHT THRU |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Valve Operation Method | AUTOMATIC |
| Thread Class | 3A ALL ENDS A |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 2637-5 | Kaiser Fluid Technologies Inc. (USA) |
| 2637-5 PRIMARY | Tactair Fluid Controls Inc (USA) |
| 6-43937-5 | Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems (USA) |
| A3038-5 | Preece Inc Decca Valves Div (USA) |
| 2637-5 | Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair (USA) |
| 6-43937-5 | Northrop Grumman Technical Services, Inc. Dba Defense Systems Sector (USA) |
| 6-43937-5 | Northrop Grumman Systems Corporation (USA) |
NSN 4820-00-772-2891 is a Valve,check, manufactured by Tactair Fluid Controls Inc, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-772-2891 has 7 cross-referenced part numbers: 2637-5 (Kaiser Fluid Technologies Inc.), 2637-5 (Tactair Fluid Controls Inc), 6-43937-5 (Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems), A3038-5 (Preece Inc Decca Valves Div), 2637-5 (Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair) and 2 more.
There are 2 known substitutes for 4820-00-772-2891: 5330-00-808-4263, 5365-01-333-3544. Verify interchangeability with system specifications before substitution.
Key specifications for 2637-5: Nominal Thread Size: 0.548 INCHES SECOND END IN; Flow Control Device: POPPET; Thread Direction: RIGHT-HAND ALL ENDS; Connection Style: FLARELESS ALL ENDS. 18 total characteristics are documented in the Federal Logistics Information System.