Model: A644XB-2-8-2

Safety Relief Valve
Description:

3a all ends thread class, right-hand all ends , poppet flow control device, inside spring bonnet type, integral bonnet attachment method.

Properties:

Thread Class
3a all ends
Thread Direction
Right-hand all ends
Flow Control Device
Poppet
Bonnet Type
Inside spring
Bonnet Attachment Method
Integral
Disk Loading Method
Spring
Maximum Operating Temp
225.0 degrees fahrenheit single response
Connection Style
G42 flared (tube) all ends
Connection Style
Flared (tube) all ends
Valve Operation Method
Automatic
Connection Type
Threaded external tube all ends
Features Provided
Bonnet packing and pressure tight outlet side
Thready Qty Per Inch (tpi)
16 all ends
Adjustable Pressure Range
+10.0 to 50.0 pounds per square inch
Maximum Operating Pressure
50.0 pounds per square inch single response
Thread Size
0.750 inches all ends
Seat Angle
37.0 degrees all ends
Opening Pressure Setting
35.0 pounds per square inch
Outside Diameter Tube Accommodated
0.500 inches all ends
Material
Steel comp 303 body
Material
Steel comp 303 seat
Material
Steel comp 416 flow control device
Material Specification
Fedstd66, aisi303/sae30303 federal standard single material response seat
Material Specification
Fedstd66, aisi303/sae30303 federal standard single material response body
Material Specification
Fedstd66, aisi416/sae51416 federal standard single material response flow control device
Media For Which Designed
Water-oil-gas single response
Surface Treatment
Passivate
Style Designator
C1 angle
Style Designator
Angle
Thread Series Designator
Unf all ends
Furnished Items And Quantity
2 ferrule
NSN
4820-00-010-1680
Part Number
A644XB-2-8-2
Description
Valve,safety Relief
CAGE
09990

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 A644XB-2-8-2 NSN 4820-00-010-1680

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

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
127220
UFC:
64490
LTL:
77.5
LCL:
--
WCC:
576
TCC:
Z
SHC:
9
ACC:
Construction Materials

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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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