The Valve,check, cataloged under National Stock Number 4820-01-370-0135, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is William Powell Company, the Dba Powell Valve Div the Starflo Corporation. Government technical data includes 27 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-370-0135 |
| Primary Part Number | 559-5IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Renewable Seat Ring Type | THREADED |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 8.500 INCHES ALL ENDS IN |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Material Document and Classification | ASTM B62 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material Document and Classification | ASTM B62 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Material Document and Classification | ASTM B126, CLASS B ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Bolt Hole Nominal Diameter | 0.880 INCHES ALL ENDS IN |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Valve Size | 5.000 INCHES IN |
| Maximum Operating Temp | 450.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Nominal Outside Diameter | 10.000 INCHES ALL ENDS IN |
| Disk Loading Method | WEIGHT |
| Bolt Hole Quantity | 8 ALL ENDS |
| Face to Face Distance | 13.000 INCHES IN |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | IRON CAST UNS F12102 BODY |
| Material | COPPER ALLOY 836 SEAT |
| Material | COPPER ALLOY 836 FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC |
| Nominal Thickness | 0.940 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 |
|---|---|
| 559-5IN PRIMARY | William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA) |
NSN 4820-01-370-0135 is a Valve,check, manufactured by William Powell Company, the Dba Powell Valve Div the Starflo Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-370-0135 has 1 manufacturer part number on file: 559-5IN (William Powell Company, the Dba Powell Valve Div the Starflo Corporation).
Key specifications for 559-5IN: Flow Control Device: DISK; Flange Shape: ROUND WITH HOLES ALL ENDS; Renewable Seat Ring Type: THREADED; Flange Face Design: PLAIN ALL ENDS. 27 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.