The Valve,safety Relief, cataloged under National Stock Number 4820-01-526-8458, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Emerson Automation Solutions Final Control Us Lp Div Navy Product Team. Government technical data includes 25 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-526-8458 |
| Primary Part Number | 20194DM41M |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Furnished Items and Quantity | 1 LEVER AND 1 PLUGGED DRAIN AND 2 TAILPIECE AND 2 NUT |
| Renewable Seat Ring Type | BOLTED |
| Connection Style | SOCKET WITH BRAZING RING (TUBE) ALL ENDS |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | ANGLE |
| Material Document and Classification | AMS 3660 ASSN STD ALL MATERIAL RESPONSES SEAT |
| Material Document and Classification | ASTM B-164 ASSN STD ALL MATERIAL RESPONSES FLOW CONTROL DEVICE |
| Material Document and Classification | ASTM B-164 ASSN STD ALL MATERIAL RESPONSES STEM |
| Material Document and Classification | ASTM B-61 ASSN STD ALL MATERIAL RESPONSES BODY |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES ALL ENDS IN |
| Operating Pressure | 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Adjustable Pressure Range | +20.0 TO 24.0 POUNDS PER SQUARE INCH LBS |
| Bonnet Type | OUTSIDE SCREW-YOKE |
| Specification/standard Data | 81349 - MIL-V-24332 GOVERNMENT SPECIFICATION |
| Maximum Operating Temp | 150.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Nondefinitive Spec/std Data | B GRADE |
| Disk Loading Method | SPRING |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | LIQUID SINGLE RESPONSE |
| Material | NICKEL ALLOY R-405 OR NICKEL ALLOY 400 STEM |
| Material | COPPER ALLOY 922 BODY |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Material | NICKEL ALLOY R-405 OR NICKEL ALLOY 400 FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| 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 |
|---|---|
| 20194DM41M PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 20194 ASSY 20194DM41M | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| 20194 | 5/9 Secondary reference Industrial Furnace Designers Inc |
| MIL-V-24332 | 5/9 Secondary reference U.S. Government activity |
| MIL-DTL-24332 | 4/1 Identification reference U.S. Government activity |
| 20194 ASSEMBLY 20194DM41M | 5/9 Secondary reference Anderson Greenwood and Co |
NSN 4820-01-526-8458 is a Valve,safety Relief, manufactured by Emerson Automation Solutions Final Control Us Lp Div Navy Product Team, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-526-8458 has 2 manufacturer part numbers on file: 20194DM41M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 20194 ASSY 20194DM41M (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
Key specifications for 20194DM41M: Flow Control Device: DISK; Furnished Items and Quantity: 1 LEVER AND 1 PLUGGED DRAIN AND 2 TAILPIECE AND 2 NUT; Renewable Seat Ring Type: BOLTED; Connection Style: SOCKET WITH BRAZING RING (TUBE) ALL ENDS. 25 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.