The Valve,check, cataloged under National Stock Number 4820-00-268-8786, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 23 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-268-8786 |
| Primary Part Number | A390 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Valve Operation Method | AUTOMATIC |
| Bolt Hole Quantity | 6 ALL ENDS |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Material Document and Classification | QQ-C-390,ALLOY D5/D/ FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Mounting Position | VERTICAL |
| Material | COPPER ALLOY 903 SEAT |
| Bolt Hole Nominal Diameter | 0.562 INCHES ALL ENDS IN |
| Style Designator | STRAIGHT THRU |
| Material Document and Classification | QQ-C-390, ALLOY D5/D/ FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Nondefinitive Spec/std Data | B TYPE AND 1 CLASS |
| Nominal Thickness | 0.500 INCHES ALL ENDS IN |
| Media for Which Designed | AIR FIRST RESPONSE |
| Material | COPPER ALLOY 903 BODY |
| Nominal Outside Diameter | 6.125 INCHES ALL ENDS IN |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Bolt Circle Nominal Diameter | 5.000 INCHES ALL ENDS IN |
| Flange Face Design | PLAIN ALL ENDS |
| First Connection Face to Centerline Distance | 6.000 INCHES IN |
| Connection Type | FLANGE ALL ENDS |
| Media for Which Designed | WATER, FRESH SECOND RESPONSE |
| Flow Control Device | POPPET |
| Material | NICKEL ALLOY OR COPPER ALLOY FLOW CONTROL DEVICE |
| Material Document and Classification | QQ-N-281 FED SPEC 1ST MATERIAL RESPONSE AND QQ-N-281 FED SPEC 2ND MATERIAL RESPONSE AND QQ-N-288 FED SPEC 3RD MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4820-00-268-8786 is a Valve,check, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-268-8786 has 2 cross-referenced part numbers: A390 (Naval Inventory Control Point Mechanicsburg), MILV17547 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).
There are 7 known substitutes for 4820-00-268-8786: 5660-00-008-3167, 6625-00-187-2601, 5660-00-531-3902 and 4 more. Verify interchangeability with system specifications before substitution.
Key specifications for A390: Valve Operation Method: AUTOMATIC; Bolt Hole Quantity: 6 ALL ENDS; Flange Shape: ROUND WITH HOLES ALL ENDS; Material Document and Classification: QQ-C-390,ALLOY D5/D/ FED SPEC SINGLE MATERIAL RESPONSE SEAT. 24 total characteristics are documented in the Federal Logistics Information System.