The Valve,check, cataloged under National Stock Number 4820-01-421-4705, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Newmans Inc New Jersey Div. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-421-4705 |
| Primary Part Number | 31F-CB2 6.00IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Newmans Inc New Jersey Div |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Bolt Circle Nominal Diameter | 9.500 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM A216, GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM A182, GRADE F6A ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM A216, GRADE WCB ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Bolt Hole Nominal Diameter | 0.875 INCHES ALL ENDS IN |
| Operating Pressure | 170.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 285.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Operating Pressure | 80.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM THIRD RESPONSE LBS |
| Valve Size | 6.000 INCHES IN |
| Maximum Operating Temp | 100.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 500.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | 800.0 FAHRENHEIT THIRD RESPONSE DEGF |
| Nominal Outside Diameter | 11.000 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 8 ALL ENDS |
| Face to Face Distance | 14.000 INCHES IN |
| Material | STEEL UNS J03002 BODY |
| Material | STEEL UNS J03002 FLOW CONTROL DEVICE |
| Material | STEEL UNS K91151 SEAT |
| Raised Face Nominal Diameter | 8.500 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Nominal Thickness | 1.000 INCHES ALL ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 31F-CB2 6.00IN PRIMARY | Newmans Inc New Jersey Div (USA) |
| Reference | Meaning |
|---|---|
| NS73106CB20 | D/9 Drawing number reference only Newmans Inc New Jersey Div |
| 31F-CB2 6.00IN | 5/9 Secondary reference Cook Bros. Mfg.& Supply Co. |
NSN 4820-01-421-4705 is a Valve,check, manufactured by Newmans Inc New Jersey Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-4705 has 1 manufacturer part number on file: 31F-CB2 6.00IN (Newmans Inc New Jersey Div).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-421-5182, 4820-01-421-5186. Verify interchangeability with system specifications before substitution.
Key specifications for 31F-CB2 6.00IN: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Bolt Circle Nominal Diameter: 9.500 INCHES ALL ENDS IN. 28 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.