NSN 4820-01-622-4747 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-622-4747. Manufacturer of record part number: 994OSY 2.5IN.
Operating Pressure: 175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Valve Size: 2.5 INCHES IN
Maximum Operating Temp: 110.0 FAHRENHEIT SINGLE RESPONSE DEGF
Face to Face Distance: 37.0 INCHES IN
Identification
NSN: 4820-01-622-4747
NIIN: 016224747
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 994OSY 2.5IN
Manufacturer: Watts Regulator Company
General Description
The Valve,check, cataloged under National Stock Number 4820-01-622-4747, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Watts Regulator Company. Government technical data includes 9 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.
Technical Specifications
Parameter
Value
NSN
4820-01-622-4747
Primary Part Number
994OSY 2.5IN
Item Name
Valve,check
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Watts Regulator Company
Status
ACTIVE
Flange Shape
ROUND ALL ENDS
Minimum Operating Temp
33.0 FAHRENHEIT DEGF
Style Designator
STRAIGHT THRU FLANGED ENDS
Operating Pressure
175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
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 4820-01-622-4747?
NSN 4820-01-622-4747 is a Valve,check, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-622-4747?
NSN 4820-01-622-4747 has 1 manufacturer part number on file: 994OSY 2.5IN (Watts Regulator Company).
What are the specifications of 994OSY 2.5IN?
Key specifications for 994OSY 2.5IN: Flange Shape: ROUND ALL ENDS; Minimum Operating Temp: 33.0 FAHRENHEIT DEGF; Style Designator: STRAIGHT THRU FLANGED ENDS; Operating Pressure: 175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 9 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-622-4747 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.