NSN 4820-01-235-3603 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-235-3603. Manufacturer of record part number: DX-10C 18T29 NMP-1521.
Adjustable Pressure Range: +18.0 TO 29.0 POUNDS PER SQUARE INCH LBS
Second Connection Face to Centerline Distance: 3.250 INCHES IN
Disk Loading Method: SPRING
Media for Which Designed: STEAM SINGLE RESPONSE
Identification
NSN: 4820-01-235-3603
NIIN: 012353603
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: DX-10C 18T29 NMP-1521
Manufacturer: Anderson Greenwood Lp Dba Anderson Greenwood Crosby
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-01-235-3603, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Anderson Greenwood Lp Dba Anderson Greenwood Crosby. Government technical data includes 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-235-3603
Primary Part Number
DX-10C 18T29 NMP-1521
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Anderson Greenwood Lp Dba Anderson Greenwood Crosby
Status
ACTIVE
Flow Control Device
DISK
Connection Type
FLANGE ALL ENDS
Style Designator
ANGLE FLANGED ENDS
Adjustable Pressure Range
+18.0 TO 29.0 POUNDS PER SQUARE INCH LBS
Second Connection Face to Centerline Distance
3.250 INCHES IN
Disk Loading Method
SPRING
Media for Which Designed
STEAM SINGLE RESPONSE
First Connection Face to Centerline Distance
3.375 INCHES IN
Material
STEEL BODY
Valve Operation Method
AUTOMATIC
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.
4820-01-266-1324DX10C 65T84PSI,NPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-276-3399DX-30C 156TO186PPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-283-9425NMP-1521 OPT 1 1POSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-394-6226DX-10C NMP-1521 OPT.1 85T104PSIPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-395-0468DX-10C NMP-1521 OPT.1 30T45PSIPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
Anderson Greenwood Lp Dba Anderson Greenwood Crosby (USA)
Reference documents
Reference
Meaning
DX-10C 18T29 NMP-1521
5/9Secondary reference
Kunkle Industries Inc Lonergan Valve Div
NMP-1521
5/9Secondary reference
Kunkle Industries Inc Lonergan Valve Div
NMP-1521
D/9Drawing number reference only
Anderson Greenwood Lp Dba Anderson Greenwood Crosby
Related Parts
4820-01-266-1324POSSIBLE MATCH
VALVE,SAFETY RELIEF
DX10C 65T84PSI,N
4820-01-276-3399POSSIBLE MATCH
VALVE,SAFETY RELIEF
DX-30C 156TO186P
4820-01-283-9425POSSIBLE MATCH
VALVE,SAFETY RELIEF
NMP-1521 OPT 1 1
4820-01-394-6226POSSIBLE MATCH
VALVE,SAFETY RELIEF
DX-10C NMP-1521 OPT.1 85T104PSI
4820-01-395-0468POSSIBLE MATCH
VALVE,SAFETY RELIEF
DX-10C NMP-1521 OPT.1 30T45PSI
Frequently Asked Questions
What is NSN 4820-01-235-3603?
NSN 4820-01-235-3603 is a Valve,safety Relief, manufactured by Anderson Greenwood Lp Dba Anderson Greenwood Crosby, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-235-3603?
NSN 4820-01-235-3603 has 1 manufacturer part number on file: DX-10C 18T29 NMP-1521 (Anderson Greenwood Lp Dba Anderson Greenwood Crosby).
What NSN replaces 4820-01-235-3603?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-266-1324, 4820-01-276-3399, 4820-01-283-9425. Verify interchangeability with system specifications before substitution.
What are the specifications of DX-10C 18T29 NMP-1521?
Key specifications for DX-10C 18T29 NMP-1521: Flow Control Device: DISK; Connection Type: FLANGE ALL ENDS; Style Designator: ANGLE FLANGED ENDS; Adjustable Pressure Range: +18.0 TO 29.0 POUNDS PER SQUARE INCH LBS. 10 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-235-3603 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.