The Valve,check, cataloged under National Stock Number 4820-01-533-9984, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-533-9984 |
| Primary Part Number | HMM11-2A-001-12.00IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Flange Shape | ROUND ALL ENDS |
| Furnished Items and Quantity | 1 SPRING |
| Flange Face Design | PLAIN ALL ENDS |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM B148 NATIONAL SPEC SINGLE MATERIAL RESPONSE BODY |
| Valve Size | 12.000 INCHES IN |
| Nominal Outside Diameter | 16.130 INCHES ALL ENDS IN |
| Face to Face Distance | 7.130 INCHES IN |
| Material | COPPER ALLOY BODY |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 7.130 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 |
|---|---|
| HMM11-2A-001-12.00IN PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| HMM11-2A-001 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4820-01-533-9984 is a Valve,check, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-533-9984 has 1 manufacturer part number on file: HMM11-2A-001-12.00IN (Velan Valve Corp.).
Key specifications for HMM11-2A-001-12.00IN: Flange Shape: ROUND ALL ENDS; Furnished Items and Quantity: 1 SPRING; Flange Face Design: PLAIN ALL ENDS; Mounting Position: HORIZONTAL OR VERTICAL. 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.