| Item Name | Valve Check |
| Federal Supply Group (FSG) | Valves |
| Federal Supply Class (FSC) | 4820 Valves Nonpowered |
| National Item Identification Number (NIIN) | 01-453-2594 (014532594) |
| NCB Code | USA (01) |
| Manufacturer | Carleton Technologies Inc, Circor Aerospace Inc, Conax Florida Corporation, East West Industries Inc |
| MRC | Criteria | Characteristic |
|---|---|---|
| CQJX | Nominal Thread Size | 0.437 INCHES ALL ENDS |
| MDCL | Material Document And Classification | QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE BODY |
| MEDA | Media For Which Designed | OXYGEN, GASEOUS SINGLE RESPONSE |
| SFTT | Surface Treatment | ANODIZE |
| AEQJ | Minimum Operating Temp | -65.0 DEG FAHRENHEIT |
| AWLS | Connection Type | THREADED EXTERNAL TUBE ALL ENDS |
| STYL | Style Designator | STRAIGHT THRU |
| BBJX | Mounting Position | HORIZONTAL OR VERTICAL |
| CXCY | Part Name Assigned By Controlling Agency | SAFETY CHECK VALVE |
| AEHZ | Maximum Operating Temp | 165.0 DEG FAHRENHEIT SINGLE RESPONSE |
| THSD | Thread Series Designator | UNF ALL ENDS |
| FEAT | Special Features | CLEANED FOR AVIATORS BREATHING OXYGEN |
| MATT | Material | ALUMINUM BODY |
| AAJF | Thread Direction | RIGHT-HAND ALL ENDS |
| AHNC | Connection Style | FLARED (TUBE) ALL ENDS |
| MRC | Decoded Requirement | Clear Text Reply |
| CQRB | Seat Angle | 37.0 DEGREES ALL ENDS |
| AQLR | Valve Operation Method | AUTOMATIC |
| AAJD | Thread Class | 3A ALL ENDS |
| CSDC | Opening Pressure Setting | 2.0 POUNDS PER SQUARE INCH |
| Relevant Components for NSN - 4820-01-453-2594, 4820014532594 | ||||
| 4820-01-396-8269 (4820013968269) | 4820-01-394-6183 (4820013946183) | 4820-00-971-1986 (4820009711986) | 4820-01-631-7474 (4820016317474) | |
| 4810-01-315-8174 (4810013158174) | 4820-01-045-1164 (4820010451164) | 4820-01-169-9733 (4820011699733) | 4820-01-233-9010 (4820012339010) | |
| 4820-01-169-8577 (4820011698577) | 4820-01-130-1407 (4820011301407) | 4810-01-641-9373 (4810016419373) | 4820-01-646-8601 (4820016468601) | |
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