The Piston,valve, cataloged under National Stock Number 4820-01-311-4987, 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1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-311-4987
Item Name
Piston,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Material
STEEL CORROSION RESISTING
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.
4820-01-311-9463PRV55B-1POSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Marotta Controls Inc
4820-01-311-9504187894-0013POSSIBLE MATCH
CAP,VALVE
Possible match (shared part number)Marotta Controls Inc
4730-01-313-45334781311-0006POSSIBLE MATCH
NUT,TUBE COUPLING
Possible match (shared part number)Marotta Controls Inc
4820-01-345-5552281354-0007POSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Marotta Controls Inc
4820-01-346-1650281343-0006POSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Marotta Controls Inc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
281343 ITEM 14
3/2Design control — primary reference
U.S. Government activity
187891-0030
5/2Secondary reference
U.S. Government activity
281343
D/9Drawing number reference only
U.S. Government activity
Related Parts
4820-01-311-9463POSSIBLE MATCH
VALVE,SAFETY RELIEF
PRV55B-1
4820-01-311-9504POSSIBLE MATCH
CAP,VALVE
187894-0013
4730-01-313-4533POSSIBLE MATCH
NUT,TUBE COUPLING
4781311-0006
4820-01-345-5552POSSIBLE MATCH
VALVE,SAFETY RELIEF
281354-0007
4820-01-346-1650POSSIBLE MATCH
VALVE,SAFETY RELIEF
281343-0006
Frequently Asked Questions
What is NSN 4820-01-311-4987?
NSN 4820-01-311-4987 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-311-4987?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-311-9463, 4820-01-311-9504, 4730-01-313-4533. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-311-4987?
Key specifications for 4820-01-311-4987: Material: STEEL CORROSION RESISTING. 1 specification is documented in the U.S. Government catalog.
Is NSN 4820-01-311-4987 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.