Product Details | SAFETY RELIEF VALVE

4820-01-186-5981 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: R10AD5F512-CM1 AND D49463, R10AD5F512CM1ANDD49463, 4820-01-186-5981, 01-186-5981, 4820011865981, 011865981

Valves | Valves, Nonpowered

Supply Group (FSG) NSN Assign. NIIN
48 11 AUG 1984 01-186-5981

Drawings & Photos | NSN 4820-01-186-5981


Demand History | NSN 4820-01-186-5981

Part Number Request Date QTY Origin
R10AD5F512-CM1 AND D49463 2022-11-332 1 DIBBS
R10AD5F512-CM1 AND D49463 2022-11-319 1 DIBBS
R10AD5F512-CM1 AND D49463 2022-05-151 1 DIBBS
R10AD5F512-CM1 AND D49463 2022-05-138 1 DIBBS
R10AD5F512-CM1 AND D49463 2022-04-94 1 DIBBS
R10AD5F512-CM1 AND D49463 2022-03-81 1 DIBBS
R10AD5F512-CM1 AND D49463 2022-02-45 1 DIBBS
4820-01-186-5981 2017-03-73 1 DIBBS
4820-01-186-5981 2012-03-68 4 DIBBS
4820-01-186-5981 2011-08-237 4 DIBBS
4820-01-186-5981 2010-09-246 5 DIBBS
4820-01-186-5981 2010-07-197 1 DIBBS
4820-01-186-5981 2009-11-319 1 DIBBS

Cross Reference | NSN 4820-01-186-5981

Part Number Cage Code Manufacturer
R10AD5F512-CM1 AND D49463 34889 HUNT VALVE COMPANY INC DBA UNION FLONETICS

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Technical Data | NSN 4820-01-186-5981

Characteristic Specifications
MATERIAL STEEL BODY NICKEL ALLOY FLOW CONTROL DEVICE NICKEL ALLOY SEAT STEEL CORROSION RESISTING STEM
STYLE DESIGNATOR C1A ANGLE FLANGED ENDS
FIRST CONNECTION FACE TO CENTERLINE DISTANCE 3.250 INCHES
SECOND CONNECTION FACE TO CENTERLINE DISTANCE 3.312 INCHES
VALVE SIZE 0.500 INCHES
FLOW CONTROL DEVICE DISK
MEDIA FOR WHICH DESIGNED WATER-OIL-GAS SINGLE RESPONSE
MAXIMUM OPERATING PRESSURE 400.0 POUNDS PER SQUARE INCH SINGLE RESPONSE
MAXIMUM OPERATING TEMP 250.0 DEG FAHRENHEIT SINGLE RESPONSE
VALVE OPERATION METHOD AUTOMATIC
CONNECTION TYPE FLANGE ALL ENDS
FLANGE SHAPE ROUND WITH HOLES ALL ENDS
NOMINAL OUTSIDE DIAMETER 4.250 INCHES 1ST END 3.500 INCHES 2ND END
NOMINAL THICKNESS 0.375 INCHES 1ST END 0.312 INCHES 2ND END
BOLT HOLE QUANTITY 4 ALL ENDS
BOLT HOLE NOMINAL DIAMETER 0.625 INCHES ALL ENDS
BOLT CIRCLE NOMINAL DIAMETER 3.125 INCHES 1ST END 2.375 INCHES 2ND END
FLANGE FACE DESIGN RAISED STRAIGHT ALL ENDS
RAISED FACE NOMINAL HEIGHT 0.062 INCHES ALL ENDS
RAISED FACE NOMINAL DIAMETER 1.375 INCHES ALL ENDS
BONNET TYPE INSIDE SCREW
BONNET ATTACHMENT METHOD THREADED
ADJUSTABLE PRESSURE RANGE 59.0 TO 72.0 POUNDS PER SQUARE INCH
FURNISHED ITEMS AND QUANTITY 1 LEVER

Restrictions/Controls & Freight Information | NSN 4820-01-186-5981

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 B Construction materials: Includes paint and related materials, prefabricated building, wood products, metal and composition materials and their products, commercial hardware and miscellaneous items, cement, asphalt, building maintenance materials.
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 4820-01-186-5981

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 CodesJNOT STOCKED, CENTRALLY PROCURED # (NON-STOCKED ITEMS) IMM/Service centrally managed but not stocked item. Procurement will be initiated only after receipt of a requisition.
Controlled Item CodeUUNCLASSIFIED
Shelf Life Code0Nondeteriorative
Purchasing QTY
UOM
1
EA : Each