Valve, Safety Relief4820-01-273-1034

NSN 4820-01-273-1034 · NIIN 012731034 · Part number 1856M-OL/SP .50X.75IPS 30T39PSI

Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 72352

Government record, cited

NSN 4820-01-273-1034 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-273-1034. Manufacturer of record part number: 1856M-OL/SP .50X.75IPS 30T39PSI.

Also searched as 4820-01-273-1034 · 4820012731034 · NIIN 012731034 · 01-273-1034 · FSC 4820 Valves, Nonpowered · CAGE 72352 · 1856M-OL/SP .50X.75IPS 30T39PSI

Nearby stock numbers ← 4820-01-273-1033 Valve, Safety Relief · 4820-01-273-1035 Valve, Safety Relief →

4820-01-273-1034 — Valves, Nonpowered

Features

Valve,safety Relief — FSC 4820
Flow Control Device: DISK
Connection Style: PLAIN,OPTIONAL END(PIPE) SECOND END
Connection Style: PLAIN (PIPE) FIRST END
Connection Type: THREADED INTERNAL PIPE SECOND END
Connection Type: THREADED EXTERNAL PIPE FIRST END
Style Designator: ANGLE
Adjustable Pressure Range: +30.0 TO 39.0 POUNDS PER SQUARE INCH LBS

Identification

NSN: 4820-01-273-1034
NIIN: 012731034
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 1856M-OL/SP .50X.75IPS 30T39PSI
Manufacturer: Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris

General Description

The Valve,safety Relief, cataloged under National Stock Number 4820-01-273-1034, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris. Government technical data includes 14 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	4820-01-273-1034
Primary Part Number	1856M-OL/SP .50X.75IPS 30T39PSI
Item Name	Valve,safety Relief
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris
Status	ACTIVE
Flow Control Device	DISK
Connection Style	PLAIN,OPTIONAL END(PIPE) SECOND END
Connection Style	PLAIN (PIPE) FIRST END
Connection Type	THREADED INTERNAL PIPE SECOND END
Connection Type	THREADED EXTERNAL PIPE FIRST END
Style Designator	ANGLE
Adjustable Pressure Range	+30.0 TO 39.0 POUNDS PER SQUARE INCH LBS
Thread Direction	RIGHT-HAND ALL ENDS
Nominal Thread Size	0.750 INCHES SECOND END IN
Nominal Thread Size	0.500 INCHES FIRST END IN
Maximum Operating Temp	450.0 FAHRENHEIT SINGLE RESPONSE DEGF
Material	COPPER ALLOY BODY
Thread Series Designator	NPT ALL ENDS
Valve Operation Method	AUTOMATIC OR MANUAL

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
1856M-OL/SP .50X.75IPS 30T39PSI PRIMARY	Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris (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 4820-01-273-1034?

NSN 4820-01-273-1034 is a Valve,safety Relief, manufactured by Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-273-1034?

NSN 4820-01-273-1034 has 1 manufacturer part number on file: 1856M-OL/SP .50X.75IPS 30T39PSI (Curtiss-Wright Flow Control Corporation Dba Farris Engineering Div Curtiss-Wright Valves Division- Farris).

What are the specifications of 1856M-OL/SP .50X.75IPS 30T39PSI?

Key specifications for 1856M-OL/SP .50X.75IPS 30T39PSI: Flow Control Device: DISK; Connection Style: PLAIN,OPTIONAL END(PIPE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END; Connection Type: THREADED INTERNAL PIPE SECOND END. 14 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-273-1034 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.

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