The Piston,valve, cataloged under National Stock Number 4820-01-689-0318, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-689-0318
Item Name
Piston,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Valve Design Control Activity
55820
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
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-689-03524952447-34POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Hamilton Sundstrand Corporation
4820-01-689-04364952447-57POSSIBLE MATCH
BALL,CHECK
Possible match (shared part number)Hamilton Sundstrand Corporation
4930-01-689-07114952447-8POSSIBLE MATCH
FILTER,FLUID
Possible match (shared part number)Hamilton Sundstrand Corporation
4940-01-689-07284952375-18POSSIBLE MATCH
COVER,PROTECTIVE,DUST AND MOISTU
Possible match (shared part number)Hamilton Sundstrand Corporation
4810-01-689-28114952447-15POSSIBLE MATCH
VALVE,REGULATING,FLUID PRESSURE
Possible match (shared part number)Hamilton Sundstrand Corporation
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
4952361-8
3/2Design control — primary reference
U.S. Government activity
4952447/SHEET 2
D/9Drawing number reference only
Rtx Corporation Div Pratt & Whitney
Related Parts
4820-01-689-0352POSSIBLE MATCH
DISK,VALVE
4952447-34
4820-01-689-0436POSSIBLE MATCH
BALL,CHECK
4952447-57
4930-01-689-0711POSSIBLE MATCH
FILTER,FLUID
4952447-8
4940-01-689-0728POSSIBLE MATCH
COVER,PROTECTIVE,DUST AND MOISTU
4952375-18
4810-01-689-2811POSSIBLE MATCH
VALVE,REGULATING,FLUID PRESSURE
4952447-15
Frequently Asked Questions
What is NSN 4820-01-689-0318?
NSN 4820-01-689-0318 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-689-0318?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-689-0352, 4820-01-689-0436, 4930-01-689-0711. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-689-0318?
Key specifications for 4820-01-689-0318: Part Name Assigned by Controlling Agency: PISTON; Valve Design Control Activity: 55820; End Item Identification: LLH0B2633. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-689-0318 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.