Product Details | SAFETY RELIEF VALVE

4820-01-418-4081 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: D49501, R10AH1H112-BM3 AND D49501, R10AH1H112BM3ANDD49501, 4820-01-418-4081, 01-418-4081, 4820014184081, 014184081

Valves | Valves, Nonpowered

Supply Group (FSG) NSN Assign. NIIN
48 25 AUG 1995 01-418-4081

Demand History | NSN 4820-01-418-4081

Part Number Request Date QTY Origin
R10AH1H112-BM3 AND D49501 2025-09-272 1 DIBBS
R10AH1H112-BM3 AND D49501 2025-09-261 1 DIBBS
R10AH1H112-BM3 AND D49501 2025-05-132 3 DIBBS
R10AH1H112-BM3 AND D49501 2025-04-120 3 DIBBS
R10AH1H112-BM3 AND D49501 2025-04-104 1 DIBBS
4820-01-418-4081 2021-10-278 1 US
R10AH1H112-BM3 AND D49501 2021-09-256 1 DIBBS
R10AH1H112-BM3 AND D49501 2021-08-243 1 DIBBS
R10AH1H112-BM3 AND D49501 2021-07-193 1 DIBBS
R10AH1H112-BM3 AND D49501 2021-06-180 1 DIBBS
R10AH1H112-BM3 AND D49501 2021-04-109 1 DIBBS
R10AH1H112-BM3 AND D49501 2021-04-98 1 DIBBS
4820-01-418-4081 2017-06-165 1 DIBBS
4820-01-418-4081 2017-04-114 2 DIBBS
4820-01-418-4081 2017-04-102 2 DIBBS
4820-01-418-4081 2017-03-75 2 DIBBS
4820-01-418-4081 2017-03-64 2 DIBBS
4820-01-418-4081 2017-02-59 1 DIBBS
4820-01-418-4081 2015-06-173 1 DIBBS
4820-01-418-4081 2015-06-152 1 DIBBS
4820-01-418-4081 2010-12-340 2 DIBBS
4820-01-418-4081 2010-08-218 1 DIBBS
4820-01-418-4081 2009-04-92 1 DIBBS

Cross Reference | NSN 4820-01-418-4081

Part Number Cage Code Manufacturer
D49501 34889 HUNT VALVE COMPANY INC DBA UNION FLONETICS
R10AH1H112-BM3 AND D49501 34889 HUNT VALVE COMPANY INC DBA UNION FLONETICS

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Technical Data | NSN 4820-01-418-4081

Characteristic Specifications
MATERIAL COPPER ALLOY 922 BODY NICKEL ALLOY AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR FLOW CONTROL DEVICE NICKEL ALLOY SEAT NICKEL ALLOY STEM
MATERIAL DOCUMENT AND CLASSIFICATION ASTM B61 ASSN STD SINGLE MATERIAL RESPONSE BODY QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE AND ASTM BG-710 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE SEAT QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE STEM
MAXIMUM OPERATING PRESSURE 400.0 POUNDS PER SQUARE INCH SINGLE RESPONSE
VALVE OPERATION METHOD AUTOMATIC
DISK LOADING METHOD SPRING
ADJUSTABLE PRESSURE RANGE 59.0 TO 72.0 POUNDS PER SQUARE INCH
III END ITEM IDENTIFICATION WASP CLASS LHD

Restrictions/Controls & Freight Information | NSN 4820-01-418-4081

Category Code Description
Shelf-Life Code:0Nondeteriorative
Hazardous Material Indicator CodeNThere is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials
Demilitarization Code:ANon-Munitions List Item/ Non-Strategic List Item - Demilitarization not required.
Controlled Inventory Item Code:UUNCLASSIFIED
Precious Metals Indicator Code:AItem 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.
Category Code Description
NMF Description 127220 PRESSURE REG/RED/RELIEF VALVES NOI
Less than car load rating
Less than truck load rating P 77.5
Water commodity Code 594 unknown
Originating Activity Code AX Defense Supply Center Columbus
Columbus, OH 43216-5000
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 4820-01-418-4081

Category Code Description
Cognizance Codes3BNavy-owned stocks of field level repairable DLA material
Naval Inventory Control Point, Mechanicsburg
Source of SupplySMSDefense Logistics Agency
Enterprise Business Systems
AgencyDNDepartment of the Navy
Service OrganizationNU.S. Navy
ReparabilityDField Level Reparables
Acquisition Advice CodesZINSURANCE/NUMERIC STOCKAGE OBJECTIVE ITEM # Items which may be required occasionally or intermittently, and prudence requires that a nominal quantity of materiel be stocked due to the essentiality or the lead time of the item. 1. The item is centrally managed, stocked, and issued. 2. Requisitions will be submitted in accordance with IMM/Service requisitioning procedures.
Controlled Item CodeUUNCLASSIFIED
Shelf Life Code0Nondeteriorative
Purchasing QTY
UOM
1
EA : Each