Product Details | SAFETY RELIEF VALVE

4820-01-374-1855 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: RV5195, RV51-95, 6819761, 4820-01-374-1855, 01-374-1855, 4820013741855, 013741855

Valves | Valves, Nonpowered

Supply Group (FSG) NSN Assign. NIIN
48 17 APR 1993 01-374-1855

Drawings & Photos | NSN 4820-01-374-1855


Demand History | NSN 4820-01-374-1855

Part Number Request Date QTY Origin
RV51-95 2025-08-230 15 DIBBS
RV51-95 2025-08-218 15 DIBBS
RV51-95 2025-04-100 3 DIBBS
RV51-95 2025-03-86 3 DIBBS
RV51-95 2024-10-289 13 DIBBS
RV51-95 2024-10-277 13 DIBBS
RV51-95 2024-02-53 59 DIBBS
RV51-95 2024-01-29 59 DIBBS
RV51-95 2023-10-285 23 DIBBS
RV51-95 2023-10-274 23 DIBBS
RV51-95 2023-08-236 9 DIBBS
RV51-95 2023-08-225 9 DIBBS
RV51-95 2023-08-220 36 DIBBS
RV51-95 2023-07-208 36 DIBBS
RV51-95 2023-04-96 30 DIBBS
RV51-95 2022-05-138 28 DIBBS
RV51-95 2022-05-125 28 DIBBS
RV51-95 2022-04-108 21 DIBBS
RV51-95 2022-03-76 21 DIBBS
RV51-95 2021-12-361 7 DIBBS
RV51-95 2021-12-350 7 DIBBS
4820-01-374-1855 2021-02-33 1 US
RV51-95 2019-11-329 31 DIBBS
RV51-95 2019-11-317 31 DIBBS
4820-01-374-1855 2018-11-329 25 DIBBS
4820-01-374-1855 2018-02-46 18 DIBBS
4820-01-374-1855 2016-09-251 21 DIBBS
4820-01-374-1855 2015-05-123 18 DIBBS
4820-01-374-1855 2013-09-252 16 DIBBS
4820-01-374-1855 2013-03-67 14 DIBBS
4820-01-374-1855 2012-09-265 6 DIBBS
4820-01-374-1855 2012-05-132 3 DIBBS
4820-01-374-1855 2012-01-19 7 DIBBS

Cross Reference | NSN 4820-01-374-1855

Part Number Cage Code Manufacturer
6819761 53711 NAVAL SEA SYSTEMS COMMAND
RV51-95 91816 CIRCOR AEROSPACE, INC. DBA CIRCLE SEAL CONTROLS

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Technical Data | NSN 4820-01-374-1855

Characteristic Specifications
MATERIAL STEEL COMP 303 BODY
STYLE DESIGNATOR C8 STRAIGHT THRU
FLOW CONTROL DEVICE DISK
MAXIMUM OPERATING PRESSURE 2500.0 POUNDS PER SQUARE INCH SINGLE RESPONSE
MAXIMUM OPERATING TEMP 250.0 DEG FAHRENHEIT SINGLE 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 0.375 INCHES 1ST END
THREAD DIRECTION RIGHT-HAND 1ST END

Restrictions/Controls & Freight Information | NSN 4820-01-374-1855

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:BMunitions 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: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 4820-01-374-1855

Category Code Description
Cognizance Codes9BNavy-owned stocks of DLA material
Naval Inventory Control Point, Mechanicsburg
Source of SupplySMSDefense Logistics Agency
Enterprise Business Systems
AgencyDNDepartment of the Navy
Service OrganizationNU.S. Navy
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