The Valve,check, cataloged under National Stock Number 4820-01-148-4997, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Flowserve Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-148-4997 |
| Primary Part Number | 573 1 1/2IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Flowserve Inc |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | RECTANGULAR ALL ENDS |
| Flange Face Design | RAISED STRAIGHT ALL ENDS |
| Nominal Length | 5.000 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Operating Pressure | 20.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Operating Pressure | 285.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Valve Size | 1.500 INCHES IN |
| Maximum Operating Temp | 100.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Maximum Operating Temp | 1000.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Nominal Width | 0.688 INCHES ALL ENDS IN |
| Face to Face Distance | 6.500 INCHES IN |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | STEEL OVERALL |
| Raised Face Nominal Diameter | 2.875 INCHES ALL ENDS IN |
| Valve Operation Method | AUTOMATIC |
| Raised Face Nominal Height | 0.062 INCHES ALL ENDS IN |
| Nominal Thickness | 0.626 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 |
|---|---|
| 573 1 1/2IN PRIMARY | Flowserve Inc (USA) |
| Reference | Meaning |
|---|---|
| F-47153 | D/9 Drawing number reference only Flowserve Inc |
| 573 11/2IN | C/1 Advisory reference — outside the item-of-supply concept Flowserve Inc |
NSN 4820-01-148-4997 is a Valve,check, manufactured by Flowserve Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-148-4997 has 1 manufacturer part number on file: 573 1 1/2IN (Flowserve Inc).
Key specifications for 573 1 1/2IN: Flow Control Device: DISK; Flange Shape: RECTANGULAR ALL ENDS; Flange Face Design: RAISED STRAIGHT ALL ENDS; Nominal Length: 5.000 INCHES ALL ENDS IN. 21 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.