The Valve,iris, cataloged under National Stock Number 4820-01-463-7031, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunter Environmental Corporation Dba Hunter Protective Systems. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-463-7031 |
| Primary Part Number | L40R0300N |
| Item Name | Valve,iris |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunter Environmental Corporation Dba Hunter Protective Systems |
| Status | ACTIVE |
| Overall Diameter | 3.000 INCHES NOMINAL IN |
| General Characteristics Item Description | 3" DIAMETER IRIS VALVE BEAD FLANGE LEVER OPERATED;VALVE OPERATES SATISFACTORILY IN TEMP. RANGE-65DEGREES F TO 600 DEGREES F; MAX. TORQUE REQ'D DOES NOT EXCEED 15 IN-LB WITH UPSTREAM STATIC PRESS. OF 20 IN OF WATER ON CLOSED VALVE;COMPLETE VALVE ASSEMBLY TO BE RETURNED TO IDL FOR ANY REPAIR OR OVERHAUL; COMPLETE VALVE ASSEMBLY FURNISHED AS A SPARE PART, NO DETAIL PARTS FURNISHED AS SPARES; PATENTED VALVE - PATENT NO. 2321336 IN |
| Specification/standard Data | 1FY-6-MILSTD-1388-2A/HD/ GOVERNMENT SPECIFICATION AND 1FY-6-MIL-STD-1561B(SHIPS)/HD/ GOVERNMENT SPECIFICATION A |
| Special Markings | OPEN POSITION LETTER "O" STAMPED INTO COVES;CLOSED POSITION LETTER "S" STAMPED INTO COVES; PART NUMBER STAMPED IN METAL FACE; AIR FLOW DIRECTION ARROW STAMPED INTO HOUSING |
| 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 |
|---|---|
| L40R0300N PRIMARY | Hunter Environmental Corporation Dba Hunter Protective Systems (USA) |
| Reference | Meaning |
|---|---|
| IV-40-500 | D/9 Drawing number reference only Hunter Environmental Corporation Dba Hunter Protective Systems |
NSN 4820-01-463-7031 is a Valve,iris, manufactured by Hunter Environmental Corporation Dba Hunter Protective Systems, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-463-7031 has 1 manufacturer part number on file: L40R0300N (Hunter Environmental Corporation Dba Hunter Protective Systems).
Key specifications for L40R0300N: Overall Diameter: 3.000 INCHES NOMINAL IN; General Characteristics Item Description: 3" DIAMETER IRIS VALVE BEAD FLANGE LEVER OPERATED;VALVE OPERATES SATISFACTORILY IN TEMP. RANGE-65DEGREES F TO 600 DEGREES F; MAX. TORQUE REQ'D DOES NOT EXCEED 15 IN-LB WITH UPSTREAM STATIC PRESS. OF 20 IN OF WATER ON CLOSED VALVE;COMPLETE VALVE ASSEMBLY TO BE RETURNED TO IDL FOR ANY REPAIR OR OVERHAUL; COMPLETE VALVE ASSEMBLY FURNISHED AS A SPARE PART, NO DETAIL PARTS FURNISHED AS SPARES; PATENTED VALVE - PATENT NO. 2321336 IN; Specification/standard Data: 1FY-6-MILSTD-1388-2A/HD/ GOVERNMENT SPECIFICATION AND 1FY-6-MIL-STD-1561B(SHIPS)/HD/ GOVERNMENT SPECIFICATION A; Special Features: NHA VALVE, IRIS. 4 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.