The Valve,safety Relief, cataloged under National Stock Number 4820-01-532-2589, 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 29 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-532-2589 |
| Primary Part Number | 1701-H 8IN |
| 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 |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Furnished Items and Quantity | 1 HANDLE |
| Renewable Seat Ring Type | THREADED |
| Bolt Circle Nominal Diameter | 14.000 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | ANGLE FLANGED ENDS |
| Material Document and Classification | MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | MIL-B-16541 MIL SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | MIL-B-994 MIL SPEC SINGLE MATERIAL RESPONSE STEM |
| Bolt Hole Nominal Diameter | 0.938 INCHES ALL ENDS IN |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Valve Size | 8.000 INCHES IN |
| Adjustable Pressure Range | +15.0 TO 25.0 POUNDS PER SQUARE INCH LBS |
| Features Provided | PRESSURE TIGHT OUTLET SIDE |
| Bonnet Type | INSIDE SPRING |
| Specification/standard Data | 81349 - MIL-V-20065 TYPE IIA GOVERNMENT SPECIFICATION |
| Maximum Operating Temp | 425.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 200.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Departure From Cited Document | FLANGES IAW B-176 |
| Second Connection Face to Centerline Distance | 10.812 INCHES IN |
| Nondefinitive Spec/std Data | II TYPE AND A COMPOSITION |
| Nominal Outside Diameter | 15.875 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Bolt Hole Quantity | 8 ALL ENDS |
| Bonnet Attachment Method | BOLTED |
| Media for Which Designed | WATER, FRESH SECOND RESPONSE |
| 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 |
|---|---|
| 1701-H 8IN PRIMARY | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| 9290 ASSY 1701-H 8IN | Emerson Automation Solutions Final Control Us Lp Div Navy Product Team (USA) |
| Reference | Meaning |
|---|---|
| MIL-V-20065 | 4/1 Identification reference U.S. Government activity |
| 9290 | D/9 Drawing number reference only Emerson Automation Solutions Final Control Us Lp Div Navy Product Team |
NSN 4820-01-532-2589 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 4820-01-532-2589 has 2 manufacturer part numbers on file: 1701-H 8IN (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team), 9290 ASSY 1701-H 8IN (Emerson Automation Solutions Final Control Us Lp Div Navy Product Team).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-532-3397, 4820-01-532-3401, 4820-01-573-1188. Verify interchangeability with system specifications before substitution.
Key specifications for 1701-H 8IN: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Furnished Items and Quantity: 1 HANDLE; Renewable Seat Ring Type: THREADED. 29 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.