NSN 4820-01-261-5644 D559B4M40, D559B-4M-40, 3255546

Product Details | SAFETY RELIEF VALVE

4820-01-261-5644 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.

Part Alternates: D559B4M40, D559B-4M-40, 3255546, 32555461, 3255546-1, 4820-01-261-5644, 01-261-5644, 4820012615644, 012615644

Valves | Valves, Nonpowered

Supply Group (FSG)	NSN Assign.	NIIN	Item Name Code (INC)
48	15 AUG 1987	01-261-5644	05488 ( VALVE, SAFETY RELIEF )

Drawings & Photos | NSN 4820-01-261-5644

Part Number	Request Date	QTY	Origin
D559B-4M-40	2025-08-219	41	DIBBS
D559B-4M-40	2024-07-193	28	DIBBS
4820-01-261-5644	2023-10-286	3	AE
D559B-4M-40	2022-05-125	54	DIBBS
4820-01-261-5644	2019-09-273	2	United States
D559B-4M-40	2019-09-262	70	DIBBS
4820-01-261-5644	2019-03-78	2	United States
4820-01-261-5644	2018-09-267	67	DIBBS
4820-01-261-5644	2018-09-256	67	DIBBS
4820-01-261-5644	2016-04-119	81	DIBBS
4820-01-261-5644	2014-06-152	85	DIBBS
4820-01-261-5644	2013-11-332	42	DIBBS
4820-01-261-5644	2013-04-106	33	DIBBS
4820-01-261-5644	2012-07-194	41	DIBBS
4820-01-261-5644	2012-06-156	0	DIBBS
4820-01-261-5644	2011-07-211	43	DIBBS
4820-01-261-5644	2010-11-320	40	DIBBS

Cross Reference | NSN 4820-01-261-5644

Part Number	Cage Code	Manufacturer
3255546	10001	NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT
3255546-1	53711	NAVAL SEA SYSTEMS COMMAND
D559B-4M-40	91816	CIRCOR AEROSPACE, INC. DBA CIRCLE SEAL CONTROLS

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Related Products | NSN 4820-01-261-5644

4820-01-261-5645, 4820-01-261-5646, 4820-01-261-5731, 4820-01-261-5732, 4820-01-261-5735

Technical Data | NSN 4820-01-261-5644

Characteristic	Specifications
MATERIAL	COPPER ALLOY BODY RUBBER PACKING
STYLE DESIGNATOR	C6 STRAIGHT THRU
FLOW CONTROL DEVICE	POPPET
MEDIA FOR WHICH DESIGNED	AIR 1ST RESPONSE ACETYLENE 2ND RESPONSE AMMONIA, GASEOUS 3RD RESPONSE REFRIGERANT 12 4TH RESPONSE HYDROGEN 5TH RESPONSE
MAXIMUM OPERATING PRESSURE	200.0 POUNDS PER SQUARE INCH SINGLE RESPONSE
MAXIMUM OPERATING TEMP	-40.0 DEG FAHRENHEIT 1ST RESPONSE 250.0 DEG FAHRENHEIT 2ND RESPONSE
VALVE OPERATION METHOD	AUTOMATIC
CONNECTION TYPE	THREADED EXTERNAL PIPE 1ST END
CONNECTION STYLE	G46B PLAIN 1ST END
THREAD SERIES DESIGNATOR	NPT 1ST END
NOMINAL THREAD SIZE	0.500 INCHES 1ST END
THREAD DIRECTION	RIGHT-HAND 1ST END
OPENING PRESSURE SETTING	40.0 POUNDS PER SQUARE INCH
ADJUSTABLE PRESSURE RANGE	0.0 TO 200.0 POUNDS PER SQUARE INCH
FURNISHED ITEMS AND QUANTITY	1 DEFLECTOR CAP

Restrictions/Controls & Freight Information | NSN 4820-01-261-5644

Restrictions
Freight

Category	Code	Description
Shelf-Life Code:	0	Nondeteriorative
Hazardous Material Indicator Code	N	There is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials
Demilitarization Code:	B	Munitions List Item - Mutilation (MUT) to the point of scrap required. (Formerly: Demilitarization not required. Trade Security Controls (TSCs) required at disposition.)
Controlled Inventory Item Code:	U	UNCLASSIFIED
Precious Metals Indicator Code:	A	Item does not contain precious metal
Criticality Code:	X	The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.
Automatic Data Processing Equipment:	0	Represents items with no ADP components. NOTE: Codes 1 through 6 are only to be used when the item is Automatic Data Processing Equipment (ADPE) in its entirety and is limited to the type meeting only one of the definitions for codes 1 through 6. (See code 9)

Category	Code	Description
NMF Description	127220	PRESSURE REG/RED/RELIEF VALVES NOI
Less than car load rating	P	77.5
Less than truck load rating	P	77.5
Water commodity Code	594	unknown
Originating Activity Code	HD	Naval Inventory Control Point Mechanicsburg, PA 17055-0788
Air Dimension Code	A	Shipment is not a consolidation and does not exceed 72 inches in any dimension.
Air Commodity	V	Vehicles, machinery, shop and warehouse equipment and supplies, including special tools and equipment, ground servicing and special purpose vehicles, marine equipment and supplies, repair and maintenance parts for the above.
Air Special Handling	Z	No special handling required.
Special Handling Code	9	unknonwn
HAZMAT
Type of Cargo	Z	No special type of cargo code applicable

Management | NSN 4820-01-261-5644

Navy

Category	Code	Description
Cognizance Codes	9B	Navy-owned stocks of DLA material Naval Inventory Control Point, Mechanicsburg
Source of Supply	SMS	Defense Logistics Agency Enterprise Business Systems
Agency	DN	Department of the Navy
Service Organization	N	U.S. Navy
Acquisition Advice Codes	D	DoD INTEGRATED MATERIEL-MANAGED, STOCKED, AND ISSUED # Issue, transfer, or shipment is not subject to specialized controls other than those imposed by the Integrated Materiel Manager/Service supply policy. 1. The item is centrally managed, stocked, and issued. 2. Requisitions must contain the fund citation required to acquire the item. Requisitions will be submitted in accordance with Integrated Materiel Manager(IMM)/Service requisitioning procedures.
Controlled Item Code	U	UNCLASSIFIED
Shelf Life Code	0	Nondeteriorative
Purchasing	QTY UOM	1 EA : Each