NSN 4820-01-434-6639 · NIIN 014346639 · Part number B15SW-8IN NO. 4
William E Williams Valve Corp · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 79342
Government record, cited
NSN 4820-01-434-6639 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-434-6639. Manufacturer of record part number: B15SW-8IN NO. 4.
Pressure Rating: 225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
Temp Rating: 406.0 FAHRENHEIT MAXIMUM DEGF
Style Designator: SWING CHECK
Media for Which Designed: STEAM OR OIL OR GAS OR WATER
Material: COPPER ALLOY
1 manufacturer part number on file
Manufacturer of record: William E Williams Valve Corp
Identification
NSN: 4820-01-434-6639
NIIN: 014346639
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: B15SW-8IN NO. 4
Manufacturer: William E Williams Valve Corp
General Description
The Disk,valve, cataloged under National Stock Number 4820-01-434-6639, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is William E Williams Valve Corp. Government technical data includes 5 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.
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-01-434-6639?
NSN 4820-01-434-6639 is a Disk,valve, manufactured by William E Williams Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-434-6639?
NSN 4820-01-434-6639 has 1 manufacturer part number on file: B15SW-8IN NO. 4 (William E Williams Valve Corp).
What are the specifications of B15SW-8IN NO. 4?
Key specifications for B15SW-8IN NO. 4: Pressure Rating: 225.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS; Temp Rating: 406.0 FAHRENHEIT MAXIMUM DEGF; Style Designator: SWING CHECK; Special Features: USED ON A 8 IN. CHECK VALVE IN. 5 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-434-6639 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.