Product Details | SAFETY RELIEF VALVE

4820-01-057-7251 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: 647B114T, 647B-1-1-4-T, 4820-01-057-7251, 01-057-7251, 4820010577251, 010577251

Valves | Valves, Nonpowered

Supply Group (FSG) NSN Assign. NIIN
48 18 MAR 1978 01-057-7251

Drawings & Photos | NSN 4820-01-057-7251


Cross Reference | NSN 4820-01-057-7251

Part Number Cage Code Manufacturer
647B-1-1-4-T 86768 TELEDYNE INDUSTRIES INC TELEDYNE FLUID SYSTEMS REPUBLIC

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Technical Data | NSN 4820-01-057-7251

Characteristic Specifications
MATERIAL STEEL COMP 303 BODY STEEL COMP 303 FLOW CONTROL DEVICE PLASTIC POLYTETRAFLUOROETHYLENE SEAT
MATERIAL DOCUMENT AND CLASSIFICATION AISI 303 ASSN STD SINGLE MATERIAL RESPONSE BODY AISI 303 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
STYLE DESIGNATOR C1 ANGLE
FLOW CONTROL DEVICE POPPET
MEDIA FOR WHICH DESIGNED OIL, HYDRAULIC SINGLE RESPONSE
MAXIMUM OPERATING PRESSURE 15.0 POUNDS PER SQUARE INCH SINGLE RESPONSE
MAXIMUM OPERATING TEMP 400.0 DEG FAHRENHEIT SINGLE RESPONSE
VALVE OPERATION METHOD AUTOMATIC
CONNECTION TYPE THREADED INTERNAL PIPE ALL ENDS
CONNECTION STYLE G9 PLAIN ALL ENDS
THREAD SERIES DESIGNATOR NPT ALL ENDS
NOMINAL THREAD SIZE 0.250 INCHES ALL ENDS
THREAD DIRECTION RIGHT-HAND ALL ENDS
BONNET TYPE INSIDE SCREW
BONNET ATTACHMENT METHOD INTEGRAL
DISK LOADING METHOD SPRING
OPENING PRESSURE SETTING 4.0 POUNDS PER SQUARE INCH
FEATURES PROVIDED PRESSURE TIGHT OUTLET SIDE

Restrictions/Controls & Freight Information | NSN 4820-01-057-7251

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:UPrecious metal type is unknown
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 4820-01-057-7251

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