Disk, Valve4820-01-198-8770

NSN 4820-01-198-8770 · NIIN 011988770 · Part number 7794-2.50IN-2

William E Williams Valve Corp · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 79342

Government record, cited

NSN 4820-01-198-8770 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-198-8770. Manufacturer of record part number: 7794-2.50IN-2.

Also searched as 4820-01-198-8770 · 4820011988770 · NIIN 011988770 · 01-198-8770 · FSC 4820 Valves, Nonpowered · CAGE 79342 · 7794-2.50IN-2 · 7794-2.50IN PIECE 2

Nearby stock numbers ← 4820-01-198-8760 Guide, Valve Stem · 4820-01-198-9028 Valve, Relief, Pressure and Temper →

4820-01-198-8770 — Valves, Nonpowered

Features

Disk,valve — FSC 4820
Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
Temp Rating: 850.0 FAHRENHEIT MAXIMUM DEGF
Outside Diameter: 3.000 INCHES NOMINAL IN
Inside Diameter: 2.500 INCHES NOMINAL IN
Media for Which Designed: STEAM
Material: STEEL
2 manufacturer part numbers on file

Identification

NSN: 4820-01-198-8770
NIIN: 011988770
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 7794-2.50IN-2
Manufacturer: William E Williams Valve Corp

General Description

The Disk,valve, cataloged under National Stock Number 4820-01-198-8770, 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 6 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. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-198-8770
Primary Part Number	7794-2.50IN-2
Item Name	Disk,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	William E Williams Valve Corp
Status	ACTIVE
Pressure Rating	150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS
Temp Rating	850.0 FAHRENHEIT MAXIMUM DEGF
Outside Diameter	3.000 INCHES NOMINAL IN
Inside Diameter	2.500 INCHES NOMINAL IN
Media for Which Designed	STEAM
Material	STEEL

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
7794-2.50IN PIECE 2	William E Williams Valve Corp (USA)
7794-2.50IN-2 PRIMARY	William E Williams Valve Corp (USA)

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

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 4820-01-198-8770?

NSN 4820-01-198-8770 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 4820-01-198-8770?

NSN 4820-01-198-8770 has 2 manufacturer part numbers on file: 7794-2.50IN PIECE 2 (William E Williams Valve Corp), 7794-2.50IN-2 (William E Williams Valve Corp).

What are the specifications of 7794-2.50IN-2?

Key specifications for 7794-2.50IN-2: Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Temp Rating: 850.0 FAHRENHEIT MAXIMUM DEGF; Outside Diameter: 3.000 INCHES NOMINAL IN; Inside Diameter: 2.500 INCHES NOMINAL IN. 6 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-198-8770 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.

PartsTable Design LLC · partstable.com