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4820-01-268-0594

Safety Relief Valve

4820012680594 012680594 1856M-OL-1/2X3/4-20PSI 18252-F(20PSI) 1896M-OL-1/2X3/4-20PSI(SPCLN)

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes VALVE (1), RELIEF, PRESSURE AND TEMPERATURE. View more Safety Relief Valve

Managed by United States

NSN Created on 22 Nov 1987

Data Last Changed
May 2023

NATO Update Count
5

NATO Data Quality

STYL Style C1 for 4820-01-268-0594 1/1 — NSN 4820-01-268-0594 (Identification) 1/1

Marketplace 4820-01-268-0594

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4820-01-268-0594 RQST NE

Restrictions 4820-01-268-0594

4820-01-268-0594 is a Safety Relief Valve that has critical features such as tolerance, fit restrictions or application. Nuclear hardness properties have not been determined. This item is a US Munitions List or Commerce Control List Item where the Item Manager, Equipment Specialist or Product Specialist must provide special demilitarization instructions. This item is not suspected to be hazardous. This item does not contain a precious metal.

Import and Export 4820-01-268-0594

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End Users 4820-01-268-0594

US Navy (N1HE)
Effective Date:: 1 Apr 1991
Supplementary Receivers:: GG; AMC 2 AMSC G IMC P IMCACTY HX

Approved Sources 4820-01-268-0594

Part Number
Manufacturer
Status
1856M-OL-1/2X3/4-20PSI: 72352 - Curtiss-Wright Flow Control (Active); Incomplete Reference; RNCC 3 RNVC 1 DAC 3
18252-F(20PSI): 72352 - Curtiss-Wright Flow Control (Active); Incomplete Secondary Reference; RNCC 5 RNVC 1 DAC C
1896M-OL-1/2X3/4-20PSI(SPCLN): 72352 - Curtiss-Wright Flow Control (Active); Incomplete Secondary Reference; RNCC 5 RNVC 1 DAC G

Datasheet 4820-01-268-0594

Characteristic
Specifications
FIIG: A046B0
Bonnet Type [ADSR]: Inside Screw
Bonnet Attachment Method [ADST]: Threaded
Connection Style [AHNC]: Plain (Pipe) 1St End
Connection Style [AHNC]: Plain,Optional End(Pipe) 2Nd End
Connection Type [AWLS]: Threaded Internal Pipe 2Nd End
Connection Type [AWLS]: Threaded External Pipe 1St End
Criticality Code Justification [CRTL]: Zzzy
Disk Loading Method [ADSU]: Spring
Flow Control Device [ADQU]: Disk
Material [MATT]: Copper Alloy Overall
Maximum Operating Pressure [CQGM]: 300.0 Pounds Per Square Inch Single Response
Maximum Operating Temp [AEHZ]: 450.0 Deg Fahrenheit Single Response
Media For Which Designed [MEDA]: Air 2Nd Response
Media For Which Designed [MEDA]: Steam 1St Response
Nominal Thread Size [CQJX]: 0.750 Inches 2Nd End
Nominal Thread Size [CQJX]: 0.500 Inches 1St End
Opening Pressure Setting [CSDC]: 20.0 Pounds Per Square Inch
Reference Number Differentiating Characteristics [ZZZY]: Material Will Be In Accordance With Ships Parts Control Center Activity Hx Quality Control,Manufacturing And Testing Specifications
Special Features [FEAT]: Clean Per Mil-Std-767 And Aor-767-1; Inspect Per Mil-I-45208; Ship Per Mil-Std-129
Thread Series Designator [THSD]: Npt 1St End
Thread Series Designator [THSD]: Npt 2Nd End
Style Designator [STYL]: Angle
Thread Direction [AAJF]: Right-Hand 2Nd End
Thread Direction [AAJF]: Right-Hand 1St End

Management Data 4820-01-268-0594

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Effective Date: Organization; Unit of Issue; Unit Price; Qty Unit Pack
Oct 2022: Department of the Navy (DN); EA; Subscribe; 1
Oct 2021: Department of the Navy (DN); EA; Subscribe; 1
Oct 2020: Department of the Navy (DN); EA; Subscribe; 1
Oct 2019: Department of the Navy (DN); EA; Subscribe; 1

Navy

Cognizance:

1H: Consumable material assigned to NAVICP MECH for inventory management
Naval Inventory Control Point, Mechanicsburg

Special Material ID:

X3: Nuclear Reactor Plant (NRP) material under the technical cognizance of the NAVSEA 08 special designed, manufactured and/or treated for use in a NRP or controls thereof. This category includes all other NRP items which are not coded X2 or X4.

Issue, Repair, Requisition Restriction Code:

BL: Submit/refer requisitions to NAVICP MECH. Centralized control for issue of repair parts for specific programs/equipment

NATO Stock Numbers Related to 4820-01-268-0594

4820-14-561-1656 4820-12-334-7815 4820-34-037-9166 4820-99-311-3098 4820-22-620-5578 4820-12-394-4232 4820-14-560-5277 4820-12-376-4609 4820-12-174-3113 4820-25-149-3059 4820-66-125-0437 4820-12-307-2275 4820-99-762-4698 4820-17-108-9424 4820-13-120-5910 4820-12-376-3740 4820-12-334-0478 4820-12-342-1920

Freight Information 4820-01-268-0594

4820-01-268-0594 has freight characteristics.It has a National Motor Freight Classification (NMFC) of 127220. A Sub NMFC of X. It has a NMFC Description of PRESSURE REG/RED/RELIEF VALVES NOI. 4820-01-268-0594 is rated as class 77.5 when transported by Less-Than Truckload (LTL) freight. 4820-01-268-0594 is rated as class 77.5 when transported by Less-Than Carload (LCL) rail or ocean freight. It has a Uniform Freight Classification (UFC) number of 64490 which rates the freight between FCL and LCL. 4820-01-268-0594 has a variance between NMFC and UFC when transported by rail and the description should be consulted. It has a Water Commodity Code (WCC) of 594 for ocean manifesting and military sealift. 4820-01-268-0594 is not classified as a special type of cargo when transported by water. 4820-01-268-0594 is not a consolidation and does not exceed 84" in any dimension. It should be compatible with a standard 72" Aircraft Cargo Door when transported by air.

Packaging Data 4820-01-268-0594

Responsible Activity
Packaging Data Source: Primary Inventory Control Activity (PICA); Packaging Data does not meet current MIL-STD-2073-1E

Storage Environment: Heated General Purpose – Heated 40 F and above

Item Pack Level (Unpackaged)

Item Size
Item Weight
Characteristics
Weight/Dimensions Category
Fragility
Item Preservation: --; --; --; Over 10lb; Less than 85G; Special Requirement

Unit Pack Level (Packaged)

Quantity per Pack
Unit Size
Unit Weight
Unit Cube
Preservation Method
Cleaning/Drying: 1; 7.0" H x 3.0" W x 3.0" L; --; --; --; Special Requirements

Preservation Material
Wrapping Material
Cushioning/Dunnage
Cushioning Thickness
Container
Special Marking: Special Requirement; Special Requirements – see Specific Instructions or Drawings provided; Special Requirements. See Specific Instructions or Drawings Provided; Special Requirements. See Specific Instructions or Drawings Provided; Special requirement – See specific instructions or drawings provided; --

Intermediate Pack Level

Quantity of Unit Packs
Container: Special requirement – See specific instructions or drawings provided