Safety Relief Valve
187-50L
(NSN) National Stock Number
4820-00-056-7677
Federal Supply Classification
4820 Nonpowered Valves
Item Name Code
05488
Schedule B Code
8481400000
Summary
0.500 inches 2nd end nominal pipe size accommodated, 0.750 inches 1st end nominal pipe size accommodated, right-hand 1st end thread direction, right-hand 2nd end thread direction, disk flow control device, inside spring bonnet type
| DAC | HCC | DMIL | RNCC |
|---|---|---|---|
| 5 | - | - | 5 |
| RNVC | SADC | MSDS | RNAAC |
|---|---|---|---|
| 9 | - | - | SB |
Identification
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.
| INC | FIIG | Concept | Condition |
|---|---|---|---|
| 05488 | A046B0 | 1 | 2 |
Specifications
Nominal Pipe Size Accommodated
0.500 inches 2nd end
Details
A measurement of the pipe size the item will accommodate.Nominal Pipe Size Accommodated
0.750 inches 1st end
Details
A measurement of the pipe size the item will accommodate.Thread Direction
right-hand 1st end
Details
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.Thread Direction
right-hand 2nd end
Details
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.Flow Control Device
disk
Details
The part that controls the flow through the item.Bonnet Type
inside spring
Details
Indicates the type of housing on the item that accommodates the stem packing or spring.Bonnet Attachment Method
threaded
Details
The means by which the bonnet is attached to the item.Disk Loading Method
spring
Details
The means of closing the item when inlet pressure decreases.Valve Discharge Flow Rate
68.0 cubic feet per minute
Details
The rated valve discharge capacity per unit of time.Maximum Operating Temp
450.0 deg fahrenheit single response
Details
The maximum temperature at which the item is rated to operate for an extended period of time.Connection Style
plain (pipe) 2nd end
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.Connection Style
plain,optional end(pipe) 1st end
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.Valve Operation Method
manual
Details
The means used to control the operation of the valve.Connection Type
threaded external pipe 2nd end
Details
Indicates the type of connection/s/.Connection Type
threaded internal pipe 1st end
Details
Indicates the type of connection/s/.Features Provided
pressure tight outlet side
Details
Those features,not otherwise specified,which may be required for proper functioning of the item.Maximum Operating Pressure
300.0 pounds per square inch single response
Details
The maximum pressure at which the item is rated for operation.Nominal Thread Size
0.500 inches 2nd end
Details
A designation that is used for the purpose of general identification of the thread.Nominal Thread Size
0.750 inches 1st end
Details
A designation that is used for the purpose of general identification of the thread.Opening Pressure Setting
30.0 pounds per square inch
Details
The predetermined pressure at which the item is calibrated to open.Material
copper alloy body
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
copper alloy seat
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
steel corrosion resisting stem
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Media For Which Designed
air 1st response
Details
The type of media for which the item is designed.Media For Which Designed
gas, natural 3rd response
Details
The type of media for which the item is designed.Media For Which Designed
steam 2nd response
Details
The type of media for which the item is designed.Style Designator
angle
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the item.Thread Series Designator
npt 2nd end
Details
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.Thread Series Designator
npt 1st end
Details
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.Master-Cross Reference List
| Part | CAGE | DAC | HCC | RNCC | RNVC | MSDS | RNAAC |
|---|---|---|---|---|---|---|---|
| 18750L | 72352 | 5 | - | 3 | 1 | - | XX |
| 1896-M40 | 72352 | 5 | - | 3 | 2 | - | ZZ |
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
| HMIC | PMIC | ESD/EMI | Criticality |
|---|---|---|---|
| N | U | - | - |
Freight
Universal / National Freight and Handling Information
| UFC | HMC | LTL | LCL |
|---|---|---|---|
| 64490 | - | P | - |
| RVC | WCC | TCC | SHC |
|---|---|---|---|
| - | 594 | Z | 9 |
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Manufacturer
CURTISS-WRIGHT FLOW CONTROL CORPORATION DBA FARRIS ENGINEERING DIV CURTISS-WRIGHT VALVES DIVISION- FARRIS
CAGE: 72352
BRECKSVILLE
, OH
, 44141-3205
UNITED STATES
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FAQs
Frequently asked questions for NSN 4820-00-056-7677
What is the NIIN of the NSN 4820-00-056-7677?
The National Item Identification Number (NIIN) of the NSN 4820-00-056-7677 is 00-056-7677
When the NSN 4820-00-056-7677 was assigned to the Federal Catalog?
It was assigned 61 years ago, on Tue, Jan 1, 1963
Does the NSN 4820-00-056-7677 contain any precious metals?
Type/content is unknown
Does the NSN 4820-00-056-7677 contain any hazardous material?
No data in HMIRS
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