The Valve,check, cataloged under National Stock Number 4820-00-946-5481, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Crissair Inc Div Esco Technologies. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-946-5481 |
| Primary Part Number | 2C8390-4 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — No Item Name Available |
| Manufacturer | Crissair Inc Div Esco Technologies |
| Status | ACTIVE |
| Mounting Facility | BULKHEAD |
| Valve Operation Method | AUTOMATIC |
| Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| Thread Class | 3A ALL ENDS A |
| Connection Style | FLARELESS ALL ENDS |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Material | STEEL COMP 303 BODY |
| Disk Loading Method | SPRING |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Seat Angle | 12.0 DEGREES ALL ENDS |
| Media for Which Designed | HYDRAULIC FLUID, PETROLEUM BASE SINGLE RESPONSE |
| Surface Treatment | PASSIVATE |
| Maximum Operating Temp | 275.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS |
| Style Designator | TEE |
| Material | STEEL COMP 416 FLOW CONTROL DEVICE |
| Opening Pressure Setting | 5.0 POUNDS PER SQUARE INCH LBS |
| Nominal Thread Size | 0.438 INCHES ALL ENDS IN |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Flow Control Device | DISK |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 3148 | Kaiser Fluid Technologies Inc. (USA) |
| SS70 | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| 2C8390-4 PRIMARY | Crissair Inc Div Esco Technologies (USA) |
| SS70-912R4C | Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair (USA) |
| 3148 | Tactair Fluid Controls Inc (USA) |
| 3148 | Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair (USA) |
| SS70-912R4C | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| SS70-912R4C | Crissair Inc Div Esco Technologies (USA) |
NSN 4820-00-946-5481 is a Valve,check, manufactured by Crissair Inc Div Esco Technologies, classified under FSC 4820 (No Item Name Available). Status: active.
NSN 4820-00-946-5481 has 8 cross-referenced part numbers: 3148 (Kaiser Fluid Technologies Inc.), SS70 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), 2C8390-4 (Crissair Inc Div Esco Technologies), SS70-912R4C (Hawker Pacific Aerospace Landing Gear and Components Mfg and Repair), 3148 (Tactair Fluid Controls Inc) and 3 more.
There are 12 known substitutes for 4820-00-946-5481: 3110-00-156-4755, 3455-00-254-8473, 3460-00-322-5949 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for 2C8390-4: Mounting Facility: BULKHEAD; Valve Operation Method: AUTOMATIC; Connection Type: THREADED EXTERNAL TUBE ALL ENDS; Thread Class: 3A ALL ENDS A. 20 total characteristics are documented in the Federal Logistics Information System.