The Valve,check, cataloged under National Stock Number 4820-01-330-0545, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is International Valve Corp Dba Check-All Valve Mfg. Co.. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-330-0545 |
| Primary Part Number | F1NSSVT.500SS |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | International Valve Corp Dba Check-All Valve Mfg. Co. |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Valve Size | 4.000 INCHES IN |
| Nominal Outside Diameter | 6.188 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Material | STEEL COMP 316 BODY |
| Material | RUBBER FLUOROCARBON CLASS FPM SEAT |
| Opening Pressure Setting | 0.5 POUNDS PER SQUARE INCH LBS |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.375 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 |
|---|---|
| F1NSSVT.500SS PRIMARY | International Valve Corp Dba Check-All Valve Mfg. Co. (USA) |
| 23036118-9 | Rolls-Royce Corporation (USA) |
| Reference | Meaning |
|---|---|
| 4"FIV-15/30-SS-V-1/2 | 5/9 Secondary reference International Valve Corp Dba Check-All Valve Mfg. Co. |
| 4.00FIV-15-SS-V-1/2 | 5/9 Secondary reference International Valve Corp Dba Check-All Valve Mfg. Co. |
| 4.00FIV1SSSV1/2 | 5/9 Secondary reference International Valve Corp Dba Check-All Valve Mfg. Co. |
| 23036118 | 7/1 Vendor item drawing reference Rolls-Royce Corporation |
NSN 4820-01-330-0545 is a Valve,check, manufactured by International Valve Corp Dba Check-All Valve Mfg. Co., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-330-0545 has 2 manufacturer part numbers on file: F1NSSVT.500SS (International Valve Corp Dba Check-All Valve Mfg. Co.), 23036118-9 (Rolls-Royce Corporation).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-415-9507. Verify interchangeability with system specifications before substitution.
Key specifications for F1NSSVT.500SS: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Connection Type: FLANGE ALL ENDS. 13 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.