Model: 1990C-1 X .75 138PSI

Safety Relief Valve

Special Features:

Carbon stee (phosphated) spring; 0.110 sq.In.Orifice area

Properties:

Thread Direction
Right-hand all ends
Flow Control Device
Disk
Disk Loading Method
Spring
Maximum Operating Temp
400.0 degrees fahrenheit single response
Minimum Operating Temp
-20.0 degrees fahrenheit
End Application
Strategic sealift conversion ships class
Connection Style
G46b plain (pipe) 1st end
Connection Style
G9 plain, optional en (pipe) 2nd end
Valve Operation Method
Automatic
Connection Type
Threaded external pipe 1st end
Connection Type
Threaded internal pipe 2nd end
Maximum Operating Pressure
2000.0 pounds per square inch single response
Thread Size
0.750 inches 1st end
Thread Size
1.000 inches 2nd end
Opening Pressure Setting
138.0 pounds per square inch
Material
Steel comp 316 body
Material
Steel comp 316 flow control device
Material
Steel comp 410 stem
Material Specification
Astm a276 cond t assn standard single material response stem
Material Specification
Astm a479 assn standard single material response body
Material Specification
Astm a479 assn standard single material response flow control device
Media For Which Designed
Steam 2nd response
Media For Which Designed
Air 1st response
Thread Series Designator
Npt all ends
Furnished Items And Quantity
1 lever
NSN
4820-01-451-2555
Part Number
1990C-1 X .75 138PSI
Description
Valve,safety Relief
CAGE
16497

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 1990C-1 X .75 138PSI NSN 4820-01-451-2555

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05488
FIIG:
A046B0
Concept No.:
1
App. Key:
AP
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
--
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
127220
UFC:
64490
LTL:
77.5
LCL:
--
WCC:
594
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8481400000
  • SITC: 74740
  • End Use: Industrial machines, other
  • NAICS: 332911
  • USDA: 1

Freight Class: Safety or relief valves

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